diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSlimServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSlimServerCodegen.java
index abf676d4fec..3ff9aad4eaa 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSlimServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PhpSlimServerCodegen.java
@@ -36,6 +36,7 @@ public class PhpSlimServerCodegen extends AbstractPhpCodegen {
     private static final Logger LOGGER = LoggerFactory.getLogger(PhpSlimServerCodegen.class);
 
     public static final String PHPCS_STANDARD = "phpcsStandard";
+    public static final String USER_CLASSNAME_KEY = "userClassname";
 
     protected String groupId = "org.openapitools";
     protected String artifactId = "openapi-server";
@@ -125,7 +126,6 @@ public class PhpSlimServerCodegen extends AbstractPhpCodegen {
         supportingFiles.add(new SupportingFile("composer.mustache", "", "composer.json"));
         supportingFiles.add(new SupportingFile("index.mustache", "", "index.php"));
         supportingFiles.add(new SupportingFile(".htaccess", "", ".htaccess"));
-        supportingFiles.add(new SupportingFile("AbstractApiController.mustache", toSrcPath(invokerPackage, srcBasePath), toAbstractName("ApiController") + ".php"));
         supportingFiles.add(new SupportingFile("SlimRouter.mustache", toSrcPath(invokerPackage, srcBasePath), "SlimRouter.php"));
         supportingFiles.add(new SupportingFile("phpunit.xml.mustache", "", "phpunit.xml.dist"));
     }
@@ -134,6 +134,7 @@ public class PhpSlimServerCodegen extends AbstractPhpCodegen {
     public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> objs, List<Object> allModels) {
         Map<String, Object> operations = (Map<String, Object>) objs.get("operations");
         List<CodegenOperation> operationList = (List<CodegenOperation>) operations.get("operation");
+        addUserClassnameToOperations(operations);
         escapeMediaType(operationList);
         return objs;
     }
@@ -160,8 +161,41 @@ public class PhpSlimServerCodegen extends AbstractPhpCodegen {
         return objs;
     }
 
+    /**
+     * Sets PHP CodeSniffer &lt;standard&gt; option. Accepts name or path of the coding standard to use.
+     *
+     * @param phpcsStandard standard option value
+     */
     public void setPhpcsStandard(String phpcsStandard) {
         this.phpcsStandard = phpcsStandard;
     }
 
+    @Override
+    public String toApiName(String name) {
+        if (name.length() == 0) {
+            return toAbstractName("DefaultApi");
+        }
+        return toAbstractName(initialCaps(name) + "Api");
+    }
+
+    @Override
+    public String toApiTestFilename(String name) {
+        if (name.length() == 0) {
+            return "DefaultApiTest";
+        }
+        return initialCaps(name) + "ApiTest";
+    }
+
+    /**
+     * Strips out abstract prefix and suffix from classname and puts it in "userClassname" property of operations object.
+     *
+     * @param operations codegen object with operations
+     */
+    private void addUserClassnameToOperations(Map<String, Object> operations) {
+        String classname = (String) operations.get("classname");
+        classname = classname.replaceAll("^" + abstractNamePrefix, "");
+        classname = classname.replaceAll(abstractNameSuffix + "$", "");
+        operations.put(USER_CLASSNAME_KEY, classname);
+    }
+
 }
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/AbstractApiController.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/AbstractApiController.mustache
deleted file mode 100644
index ab214f671fa..00000000000
--- a/modules/openapi-generator/src/main/resources/php-slim-server/AbstractApiController.mustache
+++ /dev/null
@@ -1,64 +0,0 @@
-<?php
-/**
- * Abstract Api Controller
- *
- * PHP version 5
- *
- * @category Class
- * @package  {{invokerPackage}}
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-
-/**
- {{#appName}}
- * {{{appName}}}
- *
- {{/appName}}
- {{#appDescription}}
- * {{{appDescription}}}
- {{/appDescription}}
- {{#version}}
- * OpenAPI spec version: {{{version}}}
- {{/version}}
- {{#infoEmail}}
- * Contact: {{{infoEmail}}}
- {{/infoEmail}}
- * Generated by: https://github.com/openapitools/openapi-generator.git
- */
-
-/**
- * NOTE: This class is auto generated by the openapi generator program.
- * https://github.com/openapitools/openapi-generator
- * Do not edit the class manually.
- */
-namespace {{invokerPackage}};
-
-/**
- * ApiServer Class Doc Comment
- *
- * PHP version 5
- *
- * @category Class
- * @package  {{invokerPackage}}
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-abstract class {{abstractNamePrefix}}ApiController{{abstractNameSuffix}}
-{
-
-    /**
-     * @var \Interop\Container\ContainerInterface Slim app container instance
-     */
-    protected $container;
-
-    /**
-     * Route Controller constructor receives container
-     *
-     * @param \Interop\Container\ContainerInterface $container Slim app container instance
-     */
-    public function __construct($container)
-    {
-        $this->container = $container;
-    }
-}
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/README.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/README.mustache
index 5a25a65f234..389484693fa 100644
--- a/modules/openapi-generator/src/main/resources/php-slim-server/README.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim-server/README.mustache
@@ -44,12 +44,41 @@ Command | Tool | Target
 `$ composer run phpcs` | PHP CodeSniffer | All files
 `$ composer run phplint` | phplint | All files
 
+## Show errors
+
+Change line in `./index.php`:
+```diff
+--- $router = new SlimRouter();
++++ $router = new SlimRouter(['settings' => ['displayErrorDetails' => true]]);
+```
 
 {{#generateApiDocs}}
 ## API Endpoints
 
 All URIs are relative to *{{{basePath}}}*
 
+> Important! Do not modify abstract API controllers directly! Instead extend them by implementation classes like:
+
+```php
+// src/Api/PetApi.php
+
+namespace {{apiPackage}};
+
+use {{apiPackage}}\AbstractPetApi;
+
+class PetApi extends AbstractPetApi
+{
+
+    public function addPet($request, $response, $args)
+    {
+        // your implementation of addPet method here
+    }
+}
+```
+
+Place all your implementation classes in `./src` folder accordingly.
+For instance, when abstract class located at `./lib/Api/AbstractPetApi.php` you need to create implementation class at `./src/Api/PetApi.php`.
+
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
 {{#apiInfo}}{{#apis}}{{#operations}}{{#operation}}*{{classname}}* | **{{operationId}}** | **{{httpMethod}}** {{path}} | {{#summary}}{{{summary}}}{{/summary}}
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/SlimRouter.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/SlimRouter.mustache
index 18ee144e6d5..c68b2b2022c 100644
--- a/modules/openapi-generator/src/main/resources/php-slim-server/SlimRouter.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim-server/SlimRouter.mustache
@@ -33,9 +33,6 @@
  */
 namespace {{invokerPackage}};
 
-{{#apis}}
-use {{apiPackage}}\{{classname}};
-{{/apis}}
 use Slim\App;
 use Psr\Container\ContainerInterface;
 use InvalidArgumentException;
@@ -47,7 +44,7 @@ use Tuupola\Middleware\HttpBasicAuthentication;
  * PHP version 5
  *
  * @category Class
- * @package  {{apiPackage}}
+ * @package  {{invokerPackage}}
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
@@ -59,6 +56,37 @@ class SlimRouter
      */
     private $slimApp;
 
+    /** @var array[] list of all api operations */
+    private $operations = [
+        {{#apis}}
+        {{#operations}}
+        {{#operation}}
+        [
+            'httpMethod' => '{{httpMethod}}',
+            'basePathWithoutHost' => '{{{basePathWithoutHost}}}',
+            'path' => '{{path}}',
+            'apiPackage' => '{{apiPackage}}',
+            'classname' => '{{classname}}',
+            'userClassname' => '{{userClassname}}',
+            'operationId' => '{{operationId}}',
+            'authMethods' => [
+                {{#hasAuthMethods}}
+                {{#authMethods}}
+                {{#isBasic}}
+                [
+                    'type' => '{{type}}',
+                    'isBasic' => true,
+                ],
+                {{/isBasic}}
+                {{/authMethods}}
+                {{/hasAuthMethods}}
+            ],
+        ],
+        {{/operation}}
+        {{/operations}}
+        {{/apis}}
+    ];
+
     /**
      * Class constructor
      *
@@ -67,7 +95,7 @@ class SlimRouter
      */
     public function __construct($container = [])
     {
-        $app = new App($container);
+        $this->slimApp = new App($container);
 
         $basicAuth = new HttpBasicAuthentication([
             "secure" => false,
@@ -78,26 +106,53 @@ class SlimRouter
             }
         ]);
 
-        {{#apis}}
-        {{#operations}}
-        {{#operation}}
-        $app->{{httpMethod}}(
-            '{{{basePathWithoutHost}}}{{{path}}}',
-            {{classname}}::class . ':{{operationId}}'
-{{#hasAuthMethods}}
-{{#authMethods}}
-{{#isBasic}}
-        )->add(
-            $basicAuth
-{{/isBasic}}
-{{/authMethods}}
-{{/hasAuthMethods}}
-        );
-        {{/operation}}
-        {{/operations}}
-        {{/apis}}
+        foreach ($this->operations as $operation) {
+            $callback = function ($request, $response, $arguments) use ($operation) {
+                $message = "How about extending {$operation['classname']} by {$operation['apiPackage']}\\{$operation['userClassname']} class implementing {$operation['operationId']} as a {$operation['httpMethod']} method?";
+                throw new \Exception($message);
+                return $response->withStatus(501)->write($message);
+            };
+            $middlewares = [];
 
-        $this->slimApp = $app;
+            if (class_exists("\\{$operation['apiPackage']}\\{$operation['userClassname']}")) {
+                $callback = "\\{$operation['apiPackage']}\\{$operation['userClassname']}:{$operation['operationId']}";
+            }
+
+
+            foreach ($operation['authMethods'] as $authMethod) {
+                if ($authMethod['type'] === 'http') {
+                    $middlewares[] = $basicAuth;
+                }
+            }
+
+            $this->addRoute(
+                [$operation['httpMethod']],
+                "{$operation['basePathWithoutHost']}{$operation['path']}",
+                $callback,
+                $middlewares
+            )->setName($operation['operationId']);
+        }
+    }
+
+    /**
+     * Add route with multiple methods
+     *
+     * @param string[]        $methods     Numeric array of HTTP method names
+     * @param string          $pattern     The route URI pattern
+     * @param callable|string $callable    The route callback routine
+     * @param array|null      $middlewares List of middlewares
+     *
+     * @return Slim\Interfaces\RouteInterface
+     *
+     * @throws InvalidArgumentException if the route pattern isn't a string
+     */
+    public function addRoute($methods, $pattern, $callable, $middlewares = [])
+    {
+        $route = $this->slimApp->map($methods, $pattern, $callable);
+        foreach ($middlewares as $middleware) {
+            $route->add($middleware);
+        }
+        return $route;
     }
 
     /**
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/api.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/api.mustache
index 832374d761b..d7eab314008 100644
--- a/modules/openapi-generator/src/main/resources/php-slim-server/api.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim-server/api.mustache
@@ -34,8 +34,6 @@
  */
 namespace {{apiPackage}};
 
-use {{invokerPackage}}\{{abstractNamePrefix}}ApiController{{abstractNameSuffix}};
-
 /**
  * {{classname}} Class Doc Comment
  *
@@ -46,8 +44,24 @@ use {{invokerPackage}}\{{abstractNamePrefix}}ApiController{{abstractNameSuffix}}
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class {{classname}} extends {{abstractNamePrefix}}ApiController{{abstractNameSuffix}}
+abstract class {{classname}}
 {
+
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
     {{#operations}}
     {{#operation}}
 
@@ -66,6 +80,8 @@ class {{classname}} extends {{abstractNamePrefix}}ApiController{{abstractNameSuf
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function {{operationId}}($request, $response, $args)
     {
@@ -99,8 +115,10 @@ class {{classname}} extends {{abstractNamePrefix}}ApiController{{abstractNameSuf
         {{#hasBodyParam}}
         $body = $request->getParsedBody();
         {{/hasBodyParam}}
-        $response->write('How about implementing {{nickname}} as a {{httpMethod}} method ?');
-        return $response;
+        $message = "How about implementing {{nickname}} as a {{httpMethod}} method in {{apiPackage}}\{{userClassname}} class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
     {{/operation}}
     {{/operations}}
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/api_test.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/api_test.mustache
index 204d183b48c..35cdde8439e 100644
--- a/modules/openapi-generator/src/main/resources/php-slim-server/api_test.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim-server/api_test.mustache
@@ -1,6 +1,6 @@
 <?php
-/**
- * {{classname}}Test
+{{#operations}}/**
+ * {{userClassname}}Test
  * PHP version 5
  *
  * @category Class
@@ -34,19 +34,19 @@
 namespace {{apiPackage}};
 
 use PHPUnit\Framework\TestCase;
-use {{apiPackage}}\{{classname}};
+use {{apiPackage}}\{{userClassname}};
 
 /**
- * {{classname}}Test Class Doc Comment
+ * {{userClassname}}Test Class Doc Comment
  *
  * @category Class
- * @description {{#description}}{{description}}{{/description}}{{^description}}{{classname}}{{/description}}
+ * @description {{#description}}{{description}}{{/description}}{{^description}}{{userClassname}}{{/description}}
  * @package  {{apiPackage}}
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \{{modelPackage}}\{{classname}}
+ * @coversDefaultClass \{{apiPackage}}\{{userClassname}}
  */
-{{#operations}}class {{classname}}Test extends TestCase
+class {{userClassname}}Test extends TestCase
 {
 
     /**
diff --git a/modules/openapi-generator/src/main/resources/php-slim-server/composer.mustache b/modules/openapi-generator/src/main/resources/php-slim-server/composer.mustache
index 23fea6c578f..6f23f467e29 100644
--- a/modules/openapi-generator/src/main/resources/php-slim-server/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-slim-server/composer.mustache
@@ -11,7 +11,10 @@
     "squizlabs/php_codesniffer": "^3.0"
   },
   "autoload": {
-    "psr-4": { "{{escapedInvokerPackage}}\\": "{{srcBasePath}}/" }
+    "psr-4": { "{{escapedInvokerPackage}}\\": [
+      "{{srcBasePath}}/",
+      "src/"
+    ]}
   },
   "autoload-dev": {
     "psr-4": { "{{escapedInvokerPackage}}\\": "{{testBasePath}}/" }
diff --git a/samples/server/petstore-security-test/php-slim/README.md b/samples/server/petstore-security-test/php-slim/README.md
index 51b6a30715c..31a73e777ea 100644
--- a/samples/server/petstore-security-test/php-slim/README.md
+++ b/samples/server/petstore-security-test/php-slim/README.md
@@ -44,14 +44,43 @@ Command | Tool | Target
 `$ composer run phpcs` | PHP CodeSniffer | All files
 `$ composer run phplint` | phplint | All files
 
+## Show errors
+
+Change line in `./index.php`:
+```diff
+--- $router = new SlimRouter();
++++ $router = new SlimRouter(['settings' => ['displayErrorDetails' => true]]);
+```
 
 ## API Endpoints
 
 All URIs are relative to *http://petstore.swagger.io *_/ ' \" =end -- \\r\\n \\n \\r/v2 *_/ ' \" =end -- \\r\\n \\n \\r*
 
+> Important! Do not modify abstract API controllers directly! Instead extend them by implementation classes like:
+
+```php
+// src/Api/PetApi.php
+
+namespace OpenAPIServer\Api;
+
+use OpenAPIServer\Api\AbstractPetApi;
+
+class PetApi extends AbstractPetApi
+{
+
+    public function addPet($request, $response, $args)
+    {
+        // your implementation of addPet method here
+    }
+}
+```
+
+Place all your implementation classes in `./src` folder accordingly.
+For instance, when abstract class located at `./lib/Api/AbstractPetApi.php` you need to create implementation class at `./src/Api/PetApi.php`.
+
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*FakeApi* | **testCodeInjectEndRnNR** | **PUT** /fake | To test code injection *_/ ' \" =end -- \\r\\n \\n \\r
+*AbstractFakeApi* | **testCodeInjectEndRnNR** | **PUT** /fake | To test code injection *_/ ' \" =end -- \\r\\n \\n \\r
 
 
 ## Models
diff --git a/samples/server/petstore-security-test/php-slim/composer.json b/samples/server/petstore-security-test/php-slim/composer.json
index ee30a881405..5b4e586c7c8 100644
--- a/samples/server/petstore-security-test/php-slim/composer.json
+++ b/samples/server/petstore-security-test/php-slim/composer.json
@@ -11,7 +11,10 @@
     "squizlabs/php_codesniffer": "^3.0"
   },
   "autoload": {
-    "psr-4": { "OpenAPIServer\\": "lib/" }
+    "psr-4": { "OpenAPIServer\\": [
+      "lib/",
+      "src/"
+    ]}
   },
   "autoload-dev": {
     "psr-4": { "OpenAPIServer\\": "test/" }
diff --git a/samples/server/petstore-security-test/php-slim/lib/AbstractApiController.php b/samples/server/petstore-security-test/php-slim/lib/AbstractApiController.php
deleted file mode 100644
index 9d6b899e2d3..00000000000
--- a/samples/server/petstore-security-test/php-slim/lib/AbstractApiController.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-/**
- * Abstract Api Controller
- *
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-
-/**
- * OpenAPI Petstore *_/ ' \" =end -- \\r\\n \\n \\r
- *
- * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  *_/ ' \" =end --
- * OpenAPI spec version: 1.0.0 *_/ ' \" =end -- \\r\\n \\n \\r
- * Contact: something@something.abc *_/ ' \" =end -- \\r\\n \\n \\r
- * Generated by: https://github.com/openapitools/openapi-generator.git
- */
-
-/**
- * NOTE: This class is auto generated by the openapi generator program.
- * https://github.com/openapitools/openapi-generator
- * Do not edit the class manually.
- */
-namespace OpenAPIServer;
-
-/**
- * ApiServer Class Doc Comment
- *
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-abstract class AbstractApiController
-{
-
-    /**
-     * @var \Interop\Container\ContainerInterface Slim app container instance
-     */
-    protected $container;
-
-    /**
-     * Route Controller constructor receives container
-     *
-     * @param \Interop\Container\ContainerInterface $container Slim app container instance
-     */
-    public function __construct($container)
-    {
-        $this->container = $container;
-    }
-}
diff --git a/samples/server/petstore-security-test/php-slim/lib/Api/FakeApi.php b/samples/server/petstore-security-test/php-slim/lib/Api/AbstractFakeApi.php
similarity index 68%
rename from samples/server/petstore-security-test/php-slim/lib/Api/FakeApi.php
rename to samples/server/petstore-security-test/php-slim/lib/Api/AbstractFakeApi.php
index 20beeaef3f1..961d47aaa10 100644
--- a/samples/server/petstore-security-test/php-slim/lib/Api/FakeApi.php
+++ b/samples/server/petstore-security-test/php-slim/lib/Api/AbstractFakeApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * FakeApi
+ * AbstractFakeApi
  *
  * PHP version 5
  *
@@ -26,10 +26,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * FakeApi Class Doc Comment
+ * AbstractFakeApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -38,9 +36,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class FakeApi extends AbstractApiController
+abstract class AbstractFakeApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * PUT testCodeInjectEndRnNR
      * Summary: To test code injection *_/ &#39; \&quot; &#x3D;end -- \\r\\n \\n \\r
@@ -49,11 +63,15 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testCodeInjectEndRnNR($request, $response, $args)
     {
         $testCodeInjectEndRnNR = $request->getParsedBodyParam('test code inject */ &#39; &quot; &#x3D;end -- \r\n \n \r');
-        $response->write('How about implementing testCodeInjectEndRnNR as a PUT method ?');
-        return $response;
+        $message = "How about implementing testCodeInjectEndRnNR as a PUT method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore-security-test/php-slim/lib/SlimRouter.php b/samples/server/petstore-security-test/php-slim/lib/SlimRouter.php
index 0b7509aab71..f57b96bed30 100644
--- a/samples/server/petstore-security-test/php-slim/lib/SlimRouter.php
+++ b/samples/server/petstore-security-test/php-slim/lib/SlimRouter.php
@@ -26,7 +26,6 @@
  */
 namespace OpenAPIServer;
 
-use OpenAPIServer\Api\FakeApi;
 use Slim\App;
 use Psr\Container\ContainerInterface;
 use InvalidArgumentException;
@@ -38,7 +37,7 @@ use Tuupola\Middleware\HttpBasicAuthentication;
  * PHP version 5
  *
  * @category Class
- * @package  OpenAPIServer\Api
+ * @package  OpenAPIServer
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
@@ -50,6 +49,21 @@ class SlimRouter
      */
     private $slimApp;
 
+    /** @var array[] list of all api operations */
+    private $operations = [
+        [
+            'httpMethod' => 'PUT',
+            'basePathWithoutHost' => '/ ' \" =end -- \\r\\n \\n \\r/v2 *_/ ' \" =end -- \\r\\n \\n \\r',
+            'path' => '/fake',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testCodeInjectEndRnNR',
+            'authMethods' => [
+            ],
+        ],
+    ];
+
     /**
      * Class constructor
      *
@@ -58,7 +72,7 @@ class SlimRouter
      */
     public function __construct($container = [])
     {
-        $app = new App($container);
+        $this->slimApp = new App($container);
 
         $basicAuth = new HttpBasicAuthentication([
             "secure" => false,
@@ -69,12 +83,53 @@ class SlimRouter
             }
         ]);
 
-        $app->PUT(
-            '/ ' \" =end -- \\r\\n \\n \\r/v2 *_/ ' \" =end -- \\r\\n \\n \\r/fake',
-            FakeApi::class . ':testCodeInjectEndRnNR'
-        );
+        foreach ($this->operations as $operation) {
+            $callback = function ($request, $response, $arguments) use ($operation) {
+                $message = "How about extending {$operation['classname']} by {$operation['apiPackage']}\\{$operation['userClassname']} class implementing {$operation['operationId']} as a {$operation['httpMethod']} method?";
+                throw new \Exception($message);
+                return $response->withStatus(501)->write($message);
+            };
+            $middlewares = [];
 
-        $this->slimApp = $app;
+            if (class_exists("\\{$operation['apiPackage']}\\{$operation['userClassname']}")) {
+                $callback = "\\{$operation['apiPackage']}\\{$operation['userClassname']}:{$operation['operationId']}";
+            }
+
+
+            foreach ($operation['authMethods'] as $authMethod) {
+                if ($authMethod['type'] === 'http') {
+                    $middlewares[] = $basicAuth;
+                }
+            }
+
+            $this->addRoute(
+                [$operation['httpMethod']],
+                "{$operation['basePathWithoutHost']}{$operation['path']}",
+                $callback,
+                $middlewares
+            )->setName($operation['operationId']);
+        }
+    }
+
+    /**
+     * Add route with multiple methods
+     *
+     * @param string[]        $methods     Numeric array of HTTP method names
+     * @param string          $pattern     The route URI pattern
+     * @param callable|string $callable    The route callback routine
+     * @param array|null      $middlewares List of middlewares
+     *
+     * @return Slim\Interfaces\RouteInterface
+     *
+     * @throws InvalidArgumentException if the route pattern isn't a string
+     */
+    public function addRoute($methods, $pattern, $callable, $middlewares = [])
+    {
+        $route = $this->slimApp->map($methods, $pattern, $callable);
+        foreach ($middlewares as $middleware) {
+            $route->add($middleware);
+        }
+        return $route;
     }
 
     /**
diff --git a/samples/server/petstore-security-test/php-slim/phpunit.xml.dist b/samples/server/petstore-security-test/php-slim/phpunit.xml.dist
index 7a4a5fedbcf..5804ff4945e 100644
--- a/samples/server/petstore-security-test/php-slim/phpunit.xml.dist
+++ b/samples/server/petstore-security-test/php-slim/phpunit.xml.dist
@@ -20,8 +20,8 @@
     </testsuites>
     <filter>
         <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./lib//Api</directory>
-            <directory suffix=".php">./lib//Model</directory>
+            <directory suffix=".php">./lib/Api</directory>
+            <directory suffix=".php">./lib/Model</directory>
         </whitelist>
     </filter>
 </phpunit>
\ No newline at end of file
diff --git a/samples/server/petstore-security-test/php-slim/test/Api/FakeApiTest.php b/samples/server/petstore-security-test/php-slim/test/Api/FakeApiTest.php
index 5e631afe49e..dd67697ae92 100644
--- a/samples/server/petstore-security-test/php-slim/test/Api/FakeApiTest.php
+++ b/samples/server/petstore-security-test/php-slim/test/Api/FakeApiTest.php
@@ -36,7 +36,7 @@ use OpenAPIServer\Api\FakeApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\FakeApi
+ * @coversDefaultClass \OpenAPIServer\Api\FakeApi
  */
 class FakeApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/README.md b/samples/server/petstore/php-slim/README.md
index 9c0e467e273..00e100cca4f 100644
--- a/samples/server/petstore/php-slim/README.md
+++ b/samples/server/petstore/php-slim/README.md
@@ -44,48 +44,77 @@ Command | Tool | Target
 `$ composer run phpcs` | PHP CodeSniffer | All files
 `$ composer run phplint` | phplint | All files
 
+## Show errors
+
+Change line in `./index.php`:
+```diff
+--- $router = new SlimRouter();
++++ $router = new SlimRouter(['settings' => ['displayErrorDetails' => true]]);
+```
 
 ## API Endpoints
 
 All URIs are relative to *http://petstore.swagger.io:80/v2*
 
+> Important! Do not modify abstract API controllers directly! Instead extend them by implementation classes like:
+
+```php
+// src/Api/PetApi.php
+
+namespace OpenAPIServer\Api;
+
+use OpenAPIServer\Api\AbstractPetApi;
+
+class PetApi extends AbstractPetApi
+{
+
+    public function addPet($request, $response, $args)
+    {
+        // your implementation of addPet method here
+    }
+}
+```
+
+Place all your implementation classes in `./src` folder accordingly.
+For instance, when abstract class located at `./lib/Api/AbstractPetApi.php` you need to create implementation class at `./src/Api/PetApi.php`.
+
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*AnotherFakeApi* | **call123TestSpecialTags** | **PATCH** /another-fake/dummy | To test special tags
-*FakeApi* | **fakeOuterBooleanSerialize** | **POST** /fake/outer/boolean | 
-*FakeApi* | **fakeOuterCompositeSerialize** | **POST** /fake/outer/composite | 
-*FakeApi* | **fakeOuterNumberSerialize** | **POST** /fake/outer/number | 
-*FakeApi* | **fakeOuterStringSerialize** | **POST** /fake/outer/string | 
-*FakeApi* | **testBodyWithFileSchema** | **PUT** /fake/body-with-file-schema | 
-*FakeApi* | **testBodyWithQueryParams** | **PUT** /fake/body-with-query-params | 
-*FakeApi* | **testClientModel** | **PATCH** /fake | To test \"client\" model
-*FakeApi* | **testEndpointParameters** | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트
-*FakeApi* | **testEnumParameters** | **GET** /fake | To test enum parameters
-*FakeApi* | **testGroupParameters** | **DELETE** /fake | Fake endpoint to test group parameters (optional)
-*FakeApi* | **testInlineAdditionalProperties** | **POST** /fake/inline-additionalProperties | test inline additionalProperties
-*FakeApi* | **testJsonFormData** | **GET** /fake/jsonFormData | test json serialization of form data
-*FakeClassnameTags123Api* | **testClassname** | **PATCH** /fake_classname_test | To test class name in snake case
-*PetApi* | **addPet** | **POST** /pet | Add a new pet to the store
-*PetApi* | **findPetsByStatus** | **GET** /pet/findByStatus | Finds Pets by status
-*PetApi* | **findPetsByTags** | **GET** /pet/findByTags | Finds Pets by tags
-*PetApi* | **updatePet** | **PUT** /pet | Update an existing pet
-*PetApi* | **deletePet** | **DELETE** /pet/{petId} | Deletes a pet
-*PetApi* | **getPetById** | **GET** /pet/{petId} | Find pet by ID
-*PetApi* | **updatePetWithForm** | **POST** /pet/{petId} | Updates a pet in the store with form data
-*PetApi* | **uploadFile** | **POST** /pet/{petId}/uploadImage | uploads an image
-*PetApi* | **uploadFileWithRequiredFile** | **POST** /fake/{petId}/uploadImageWithRequiredFile | uploads an image (required)
-*StoreApi* | **getInventory** | **GET** /store/inventory | Returns pet inventories by status
-*StoreApi* | **placeOrder** | **POST** /store/order | Place an order for a pet
-*StoreApi* | **deleteOrder** | **DELETE** /store/order/{order_id} | Delete purchase order by ID
-*StoreApi* | **getOrderById** | **GET** /store/order/{order_id} | Find purchase order by ID
-*UserApi* | **createUser** | **POST** /user | Create user
-*UserApi* | **createUsersWithArrayInput** | **POST** /user/createWithArray | Creates list of users with given input array
-*UserApi* | **createUsersWithListInput** | **POST** /user/createWithList | Creates list of users with given input array
-*UserApi* | **loginUser** | **GET** /user/login | Logs user into the system
-*UserApi* | **logoutUser** | **GET** /user/logout | Logs out current logged in user session
-*UserApi* | **deleteUser** | **DELETE** /user/{username} | Delete user
-*UserApi* | **getUserByName** | **GET** /user/{username} | Get user by user name
-*UserApi* | **updateUser** | **PUT** /user/{username} | Updated user
+*AbstractAnotherFakeApi* | **call123TestSpecialTags** | **PATCH** /another-fake/dummy | To test special tags
+*AbstractFakeApi* | **fakeOuterBooleanSerialize** | **POST** /fake/outer/boolean | 
+*AbstractFakeApi* | **fakeOuterCompositeSerialize** | **POST** /fake/outer/composite | 
+*AbstractFakeApi* | **fakeOuterNumberSerialize** | **POST** /fake/outer/number | 
+*AbstractFakeApi* | **fakeOuterStringSerialize** | **POST** /fake/outer/string | 
+*AbstractFakeApi* | **testBodyWithFileSchema** | **PUT** /fake/body-with-file-schema | 
+*AbstractFakeApi* | **testBodyWithQueryParams** | **PUT** /fake/body-with-query-params | 
+*AbstractFakeApi* | **testClientModel** | **PATCH** /fake | To test \"client\" model
+*AbstractFakeApi* | **testEndpointParameters** | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트
+*AbstractFakeApi* | **testEnumParameters** | **GET** /fake | To test enum parameters
+*AbstractFakeApi* | **testGroupParameters** | **DELETE** /fake | Fake endpoint to test group parameters (optional)
+*AbstractFakeApi* | **testInlineAdditionalProperties** | **POST** /fake/inline-additionalProperties | test inline additionalProperties
+*AbstractFakeApi* | **testJsonFormData** | **GET** /fake/jsonFormData | test json serialization of form data
+*AbstractFakeClassnameTags123Api* | **testClassname** | **PATCH** /fake_classname_test | To test class name in snake case
+*AbstractPetApi* | **addPet** | **POST** /pet | Add a new pet to the store
+*AbstractPetApi* | **findPetsByStatus** | **GET** /pet/findByStatus | Finds Pets by status
+*AbstractPetApi* | **findPetsByTags** | **GET** /pet/findByTags | Finds Pets by tags
+*AbstractPetApi* | **updatePet** | **PUT** /pet | Update an existing pet
+*AbstractPetApi* | **deletePet** | **DELETE** /pet/{petId} | Deletes a pet
+*AbstractPetApi* | **getPetById** | **GET** /pet/{petId} | Find pet by ID
+*AbstractPetApi* | **updatePetWithForm** | **POST** /pet/{petId} | Updates a pet in the store with form data
+*AbstractPetApi* | **uploadFile** | **POST** /pet/{petId}/uploadImage | uploads an image
+*AbstractPetApi* | **uploadFileWithRequiredFile** | **POST** /fake/{petId}/uploadImageWithRequiredFile | uploads an image (required)
+*AbstractStoreApi* | **getInventory** | **GET** /store/inventory | Returns pet inventories by status
+*AbstractStoreApi* | **placeOrder** | **POST** /store/order | Place an order for a pet
+*AbstractStoreApi* | **deleteOrder** | **DELETE** /store/order/{order_id} | Delete purchase order by ID
+*AbstractStoreApi* | **getOrderById** | **GET** /store/order/{order_id} | Find purchase order by ID
+*AbstractUserApi* | **createUser** | **POST** /user | Create user
+*AbstractUserApi* | **createUsersWithArrayInput** | **POST** /user/createWithArray | Creates list of users with given input array
+*AbstractUserApi* | **createUsersWithListInput** | **POST** /user/createWithList | Creates list of users with given input array
+*AbstractUserApi* | **loginUser** | **GET** /user/login | Logs user into the system
+*AbstractUserApi* | **logoutUser** | **GET** /user/logout | Logs out current logged in user session
+*AbstractUserApi* | **deleteUser** | **DELETE** /user/{username} | Delete user
+*AbstractUserApi* | **getUserByName** | **GET** /user/{username} | Get user by user name
+*AbstractUserApi* | **updateUser** | **PUT** /user/{username} | Updated user
 
 
 ## Models
diff --git a/samples/server/petstore/php-slim/composer.json b/samples/server/petstore/php-slim/composer.json
index ee30a881405..5b4e586c7c8 100644
--- a/samples/server/petstore/php-slim/composer.json
+++ b/samples/server/petstore/php-slim/composer.json
@@ -11,7 +11,10 @@
     "squizlabs/php_codesniffer": "^3.0"
   },
   "autoload": {
-    "psr-4": { "OpenAPIServer\\": "lib/" }
+    "psr-4": { "OpenAPIServer\\": [
+      "lib/",
+      "src/"
+    ]}
   },
   "autoload-dev": {
     "psr-4": { "OpenAPIServer\\": "test/" }
diff --git a/samples/server/petstore/php-slim/lib/AbstractApiController.php b/samples/server/petstore/php-slim/lib/AbstractApiController.php
deleted file mode 100644
index 9f20afc8770..00000000000
--- a/samples/server/petstore/php-slim/lib/AbstractApiController.php
+++ /dev/null
@@ -1,55 +0,0 @@
-<?php
-/**
- * Abstract Api Controller
- *
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-
-/**
- * OpenAPI Petstore
- *
- * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
- * OpenAPI spec version: 1.0.0
- * Generated by: https://github.com/openapitools/openapi-generator.git
- */
-
-/**
- * NOTE: This class is auto generated by the openapi generator program.
- * https://github.com/openapitools/openapi-generator
- * Do not edit the class manually.
- */
-namespace OpenAPIServer;
-
-/**
- * ApiServer Class Doc Comment
- *
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-abstract class AbstractApiController
-{
-
-    /**
-     * @var \Interop\Container\ContainerInterface Slim app container instance
-     */
-    protected $container;
-
-    /**
-     * Route Controller constructor receives container
-     *
-     * @param \Interop\Container\ContainerInterface $container Slim app container instance
-     */
-    public function __construct($container)
-    {
-        $this->container = $container;
-    }
-}
diff --git a/samples/server/petstore/php-slim/lib/Api/AnotherFakeApi.php b/samples/server/petstore/php-slim/lib/Api/AbstractAnotherFakeApi.php
similarity index 64%
rename from samples/server/petstore/php-slim/lib/Api/AnotherFakeApi.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractAnotherFakeApi.php
index 31a641e5528..901b4a6c07c 100644
--- a/samples/server/petstore/php-slim/lib/Api/AnotherFakeApi.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractAnotherFakeApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * AnotherFakeApi
+ * AbstractAnotherFakeApi
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * AnotherFakeApi Class Doc Comment
+ * AbstractAnotherFakeApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class AnotherFakeApi extends AbstractApiController
+abstract class AbstractAnotherFakeApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * PATCH call123TestSpecialTags
      * Summary: To test special tags
@@ -49,11 +63,15 @@ class AnotherFakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function call123TestSpecialTags($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing call123TestSpecialTags as a PATCH method ?');
-        return $response;
+        $message = "How about implementing call123TestSpecialTags as a PATCH method in OpenAPIServer\Api\AnotherFakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Api/FakeApi.php b/samples/server/petstore/php-slim/lib/Api/AbstractFakeApi.php
similarity index 70%
rename from samples/server/petstore/php-slim/lib/Api/FakeApi.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractFakeApi.php
index d6dd7958c8f..244431feeca 100644
--- a/samples/server/petstore/php-slim/lib/Api/FakeApi.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractFakeApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * FakeApi
+ * AbstractFakeApi
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * FakeApi Class Doc Comment
+ * AbstractFakeApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class FakeApi extends AbstractApiController
+abstract class AbstractFakeApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * POST fakeOuterBooleanSerialize
      * Notes: Test serialization of outer boolean types
@@ -48,12 +62,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function fakeOuterBooleanSerialize($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing fakeOuterBooleanSerialize as a POST method ?');
-        return $response;
+        $message = "How about implementing fakeOuterBooleanSerialize as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -64,12 +82,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function fakeOuterCompositeSerialize($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing fakeOuterCompositeSerialize as a POST method ?');
-        return $response;
+        $message = "How about implementing fakeOuterCompositeSerialize as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -80,12 +102,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function fakeOuterNumberSerialize($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing fakeOuterNumberSerialize as a POST method ?');
-        return $response;
+        $message = "How about implementing fakeOuterNumberSerialize as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -96,12 +122,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function fakeOuterStringSerialize($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing fakeOuterStringSerialize as a POST method ?');
-        return $response;
+        $message = "How about implementing fakeOuterStringSerialize as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -111,12 +141,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testBodyWithFileSchema($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing testBodyWithFileSchema as a PUT method ?');
-        return $response;
+        $message = "How about implementing testBodyWithFileSchema as a PUT method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -125,14 +159,18 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testBodyWithQueryParams($request, $response, $args)
     {
         $queryParams = $request->getQueryParams();
         $query = $request->getQueryParam('query');
         $body = $request->getParsedBody();
-        $response->write('How about implementing testBodyWithQueryParams as a PUT method ?');
-        return $response;
+        $message = "How about implementing testBodyWithQueryParams as a PUT method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -144,12 +182,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testClientModel($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing testClientModel as a PATCH method ?');
-        return $response;
+        $message = "How about implementing testClientModel as a PATCH method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -160,6 +202,8 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testEndpointParameters($request, $response, $args)
     {
@@ -177,8 +221,10 @@ class FakeApi extends AbstractApiController
         $dateTime = $request->getParsedBodyParam('dateTime');
         $password = $request->getParsedBodyParam('password');
         $callback = $request->getParsedBodyParam('callback');
-        $response->write('How about implementing testEndpointParameters as a POST method ?');
-        return $response;
+        $message = "How about implementing testEndpointParameters as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -189,6 +235,8 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testEnumParameters($request, $response, $args)
     {
@@ -202,8 +250,10 @@ class FakeApi extends AbstractApiController
         $enumQueryDouble = $request->getQueryParam('enum_query_double');
         $enumFormStringArray = $request->getParsedBodyParam('enum_form_string_array');
         $enumFormString = $request->getParsedBodyParam('enum_form_string');
-        $response->write('How about implementing testEnumParameters as a GET method ?');
-        return $response;
+        $message = "How about implementing testEnumParameters as a GET method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -214,6 +264,8 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testGroupParameters($request, $response, $args)
     {
@@ -225,8 +277,10 @@ class FakeApi extends AbstractApiController
         $requiredInt64Group = $request->getQueryParam('required_int64_group');
         $stringGroup = $request->getQueryParam('string_group');
         $int64Group = $request->getQueryParam('int64_group');
-        $response->write('How about implementing testGroupParameters as a DELETE method ?');
-        return $response;
+        $message = "How about implementing testGroupParameters as a DELETE method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -236,12 +290,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testInlineAdditionalProperties($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing testInlineAdditionalProperties as a POST method ?');
-        return $response;
+        $message = "How about implementing testInlineAdditionalProperties as a POST method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -251,12 +309,16 @@ class FakeApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testJsonFormData($request, $response, $args)
     {
         $param = $request->getParsedBodyParam('param');
         $param2 = $request->getParsedBodyParam('param2');
-        $response->write('How about implementing testJsonFormData as a GET method ?');
-        return $response;
+        $message = "How about implementing testJsonFormData as a GET method in OpenAPIServer\Api\FakeApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Api/FakeClassnameTags123Api.php b/samples/server/petstore/php-slim/lib/Api/AbstractFakeClassnameTags123Api.php
similarity index 63%
rename from samples/server/petstore/php-slim/lib/Api/FakeClassnameTags123Api.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractFakeClassnameTags123Api.php
index c4699994049..7d4c971ccea 100644
--- a/samples/server/petstore/php-slim/lib/Api/FakeClassnameTags123Api.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractFakeClassnameTags123Api.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * FakeClassnameTags123Api
+ * AbstractFakeClassnameTags123Api
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * FakeClassnameTags123Api Class Doc Comment
+ * AbstractFakeClassnameTags123Api Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class FakeClassnameTags123Api extends AbstractApiController
+abstract class AbstractFakeClassnameTags123Api
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * PATCH testClassname
      * Summary: To test class name in snake case
@@ -49,11 +63,15 @@ class FakeClassnameTags123Api extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function testClassname($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing testClassname as a PATCH method ?');
-        return $response;
+        $message = "How about implementing testClassname as a PATCH method in OpenAPIServer\Api\FakeClassnameTags123Api class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Api/PetApi.php b/samples/server/petstore/php-slim/lib/Api/AbstractPetApi.php
similarity index 67%
rename from samples/server/petstore/php-slim/lib/Api/PetApi.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractPetApi.php
index 08fd51b46e9..66331198991 100644
--- a/samples/server/petstore/php-slim/lib/Api/PetApi.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractPetApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * PetApi
+ * AbstractPetApi
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * PetApi Class Doc Comment
+ * AbstractPetApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class PetApi extends AbstractApiController
+abstract class AbstractPetApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * POST addPet
      * Summary: Add a new pet to the store
@@ -47,12 +61,16 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function addPet($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing addPet as a POST method ?');
-        return $response;
+        $message = "How about implementing addPet as a POST method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -62,14 +80,18 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function deletePet($request, $response, $args)
     {
         $headers = $request->getHeaders();
         $apiKey = $request->hasHeader('api_key') ? $headers['api_key'] : null;
         $petId = $args['petId'];
-        $response->write('How about implementing deletePet as a DELETE method ?');
-        return $response;
+        $message = "How about implementing deletePet as a DELETE method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -81,13 +103,17 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function findPetsByStatus($request, $response, $args)
     {
         $queryParams = $request->getQueryParams();
         $status = $request->getQueryParam('status');
-        $response->write('How about implementing findPetsByStatus as a GET method ?');
-        return $response;
+        $message = "How about implementing findPetsByStatus as a GET method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -99,13 +125,17 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function findPetsByTags($request, $response, $args)
     {
         $queryParams = $request->getQueryParams();
         $tags = $request->getQueryParam('tags');
-        $response->write('How about implementing findPetsByTags as a GET method ?');
-        return $response;
+        $message = "How about implementing findPetsByTags as a GET method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -117,12 +147,16 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function getPetById($request, $response, $args)
     {
         $petId = $args['petId'];
-        $response->write('How about implementing getPetById as a GET method ?');
-        return $response;
+        $message = "How about implementing getPetById as a GET method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -132,12 +166,16 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function updatePet($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing updatePet as a PUT method ?');
-        return $response;
+        $message = "How about implementing updatePet as a PUT method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -147,14 +185,18 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function updatePetWithForm($request, $response, $args)
     {
         $petId = $args['petId'];
         $name = $request->getParsedBodyParam('name');
         $status = $request->getParsedBodyParam('status');
-        $response->write('How about implementing updatePetWithForm as a POST method ?');
-        return $response;
+        $message = "How about implementing updatePetWithForm as a POST method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -165,14 +207,18 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function uploadFile($request, $response, $args)
     {
         $petId = $args['petId'];
         $additionalMetadata = $request->getParsedBodyParam('additionalMetadata');
         $file = (key_exists('file', $request->getUploadedFiles())) ? $request->getUploadedFiles()['file'] : null;
-        $response->write('How about implementing uploadFile as a POST method ?');
-        return $response;
+        $message = "How about implementing uploadFile as a POST method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -183,13 +229,17 @@ class PetApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function uploadFileWithRequiredFile($request, $response, $args)
     {
         $petId = $args['petId'];
         $additionalMetadata = $request->getParsedBodyParam('additionalMetadata');
         $requiredFile = (key_exists('requiredFile', $request->getUploadedFiles())) ? $request->getUploadedFiles()['requiredFile'] : null;
-        $response->write('How about implementing uploadFileWithRequiredFile as a POST method ?');
-        return $response;
+        $message = "How about implementing uploadFileWithRequiredFile as a POST method in OpenAPIServer\Api\PetApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Api/StoreApi.php b/samples/server/petstore/php-slim/lib/Api/AbstractStoreApi.php
similarity index 66%
rename from samples/server/petstore/php-slim/lib/Api/StoreApi.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractStoreApi.php
index f668236a34f..60f217b3eef 100644
--- a/samples/server/petstore/php-slim/lib/Api/StoreApi.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractStoreApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * StoreApi
+ * AbstractStoreApi
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * StoreApi Class Doc Comment
+ * AbstractStoreApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class StoreApi extends AbstractApiController
+abstract class AbstractStoreApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * DELETE deleteOrder
      * Summary: Delete purchase order by ID
@@ -48,12 +62,16 @@ class StoreApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function deleteOrder($request, $response, $args)
     {
         $orderId = $args['order_id'];
-        $response->write('How about implementing deleteOrder as a DELETE method ?');
-        return $response;
+        $message = "How about implementing deleteOrder as a DELETE method in OpenAPIServer\Api\StoreApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -65,11 +83,15 @@ class StoreApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function getInventory($request, $response, $args)
     {
-        $response->write('How about implementing getInventory as a GET method ?');
-        return $response;
+        $message = "How about implementing getInventory as a GET method in OpenAPIServer\Api\StoreApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -81,12 +103,16 @@ class StoreApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function getOrderById($request, $response, $args)
     {
         $orderId = $args['order_id'];
-        $response->write('How about implementing getOrderById as a GET method ?');
-        return $response;
+        $message = "How about implementing getOrderById as a GET method in OpenAPIServer\Api\StoreApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -97,11 +123,15 @@ class StoreApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function placeOrder($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing placeOrder as a POST method ?');
-        return $response;
+        $message = "How about implementing placeOrder as a POST method in OpenAPIServer\Api\StoreApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Api/UserApi.php b/samples/server/petstore/php-slim/lib/Api/AbstractUserApi.php
similarity index 64%
rename from samples/server/petstore/php-slim/lib/Api/UserApi.php
rename to samples/server/petstore/php-slim/lib/Api/AbstractUserApi.php
index ef9863cfc33..0b69096365d 100644
--- a/samples/server/petstore/php-slim/lib/Api/UserApi.php
+++ b/samples/server/petstore/php-slim/lib/Api/AbstractUserApi.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * UserApi
+ * AbstractUserApi
  *
  * PHP version 5
  *
@@ -25,10 +25,8 @@
  */
 namespace OpenAPIServer\Api;
 
-use OpenAPIServer\AbstractApiController;
-
 /**
- * UserApi Class Doc Comment
+ * AbstractUserApi Class Doc Comment
  *
  * PHP version 5
  *
@@ -37,9 +35,25 @@ use OpenAPIServer\AbstractApiController;
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
-class UserApi extends AbstractApiController
+abstract class AbstractUserApi
 {
 
+    /**
+     * @var \Interop\Container\ContainerInterface Slim app container instance
+     */
+    protected $container;
+
+    /**
+     * Route Controller constructor receives container
+     *
+     * @param \Interop\Container\ContainerInterface $container Slim app container instance
+     */
+    public function __construct($container)
+    {
+        $this->container = $container;
+    }
+
+
     /**
      * POST createUser
      * Summary: Create user
@@ -48,12 +62,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function createUser($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing createUser as a POST method ?');
-        return $response;
+        $message = "How about implementing createUser as a POST method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -63,12 +81,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function createUsersWithArrayInput($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing createUsersWithArrayInput as a POST method ?');
-        return $response;
+        $message = "How about implementing createUsersWithArrayInput as a POST method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -78,12 +100,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function createUsersWithListInput($request, $response, $args)
     {
         $body = $request->getParsedBody();
-        $response->write('How about implementing createUsersWithListInput as a POST method ?');
-        return $response;
+        $message = "How about implementing createUsersWithListInput as a POST method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -94,12 +120,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function deleteUser($request, $response, $args)
     {
         $username = $args['username'];
-        $response->write('How about implementing deleteUser as a DELETE method ?');
-        return $response;
+        $message = "How about implementing deleteUser as a DELETE method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -110,12 +140,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function getUserByName($request, $response, $args)
     {
         $username = $args['username'];
-        $response->write('How about implementing getUserByName as a GET method ?');
-        return $response;
+        $message = "How about implementing getUserByName as a GET method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -126,14 +160,18 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function loginUser($request, $response, $args)
     {
         $queryParams = $request->getQueryParams();
         $username = $request->getQueryParam('username');
         $password = $request->getQueryParam('password');
-        $response->write('How about implementing loginUser as a GET method ?');
-        return $response;
+        $message = "How about implementing loginUser as a GET method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -143,11 +181,15 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function logoutUser($request, $response, $args)
     {
-        $response->write('How about implementing logoutUser as a GET method ?');
-        return $response;
+        $message = "How about implementing logoutUser as a GET method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 
     /**
@@ -158,12 +200,16 @@ class UserApi extends AbstractApiController
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
+     *
+     * @return \Psr\Http\Message\ResponseInterface
      */
     public function updateUser($request, $response, $args)
     {
         $username = $args['username'];
         $body = $request->getParsedBody();
-        $response->write('How about implementing updateUser as a PUT method ?');
-        return $response;
+        $message = "How about implementing updateUser as a PUT method in OpenAPIServer\Api\UserApi class?";
+        throw new \Exception($message);
+
+        return $response->write($message)->withStatus(501);
     }
 }
diff --git a/samples/server/petstore/php-slim/lib/Model/AnimalFarm.php b/samples/server/petstore/php-slim/lib/Model/AnimalFarm.php
deleted file mode 100644
index 36466e01819..00000000000
--- a/samples/server/petstore/php-slim/lib/Model/AnimalFarm.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-/**
- * AnimalFarm
- */
-namespace OpenAPIServer\Model;
-
-/**
- * AnimalFarm
- */
-class AnimalFarm
-{
-}
diff --git a/samples/server/petstore/php-slim/lib/Model/StringBooleanMap.php b/samples/server/petstore/php-slim/lib/Model/StringBooleanMap.php
deleted file mode 100644
index 5d501968961..00000000000
--- a/samples/server/petstore/php-slim/lib/Model/StringBooleanMap.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-/**
- * StringBooleanMap
- */
-namespace OpenAPIServer\Model;
-
-/**
- * StringBooleanMap
- */
-class StringBooleanMap
-{
-}
diff --git a/samples/server/petstore/php-slim/lib/SlimRouter.php b/samples/server/petstore/php-slim/lib/SlimRouter.php
index 51071bb2f8f..9f195312bbd 100644
--- a/samples/server/petstore/php-slim/lib/SlimRouter.php
+++ b/samples/server/petstore/php-slim/lib/SlimRouter.php
@@ -25,12 +25,6 @@
  */
 namespace OpenAPIServer;
 
-use OpenAPIServer\Api\AnotherFakeApi;
-use OpenAPIServer\Api\FakeApi;
-use OpenAPIServer\Api\FakeClassnameTags123Api;
-use OpenAPIServer\Api\PetApi;
-use OpenAPIServer\Api\StoreApi;
-use OpenAPIServer\Api\UserApi;
 use Slim\App;
 use Psr\Container\ContainerInterface;
 use InvalidArgumentException;
@@ -42,7 +36,7 @@ use Tuupola\Middleware\HttpBasicAuthentication;
  * PHP version 5
  *
  * @category Class
- * @package  OpenAPIServer\Api
+ * @package  OpenAPIServer
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
  */
@@ -54,6 +48,399 @@ class SlimRouter
      */
     private $slimApp;
 
+    /** @var array[] list of all api operations */
+    private $operations = [
+        [
+            'httpMethod' => 'PATCH',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/another-fake/dummy',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractAnotherFakeApi',
+            'userClassname' => 'AnotherFakeApi',
+            'operationId' => 'call123TestSpecialTags',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/outer/boolean',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'fakeOuterBooleanSerialize',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/outer/composite',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'fakeOuterCompositeSerialize',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/outer/number',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'fakeOuterNumberSerialize',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/outer/string',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'fakeOuterStringSerialize',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PUT',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/body-with-file-schema',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testBodyWithFileSchema',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PUT',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/body-with-query-params',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testBodyWithQueryParams',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PATCH',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testClientModel',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testEndpointParameters',
+            'authMethods' => [
+                [
+                    'type' => 'http',
+                    'isBasic' => true,
+                ],
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testEnumParameters',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'DELETE',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testGroupParameters',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/inline-additionalProperties',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testInlineAdditionalProperties',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/jsonFormData',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeApi',
+            'userClassname' => 'FakeApi',
+            'operationId' => 'testJsonFormData',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PATCH',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake_classname_test',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractFakeClassnameTags123Api',
+            'userClassname' => 'FakeClassnameTags123Api',
+            'operationId' => 'testClassname',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'addPet',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/findByStatus',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'findPetsByStatus',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/findByTags',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'findPetsByTags',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PUT',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'updatePet',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'DELETE',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/{petId}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'deletePet',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/{petId}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'getPetById',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/{petId}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'updatePetWithForm',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/pet/{petId}/uploadImage',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'uploadFile',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/fake/{petId}/uploadImageWithRequiredFile',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractPetApi',
+            'userClassname' => 'PetApi',
+            'operationId' => 'uploadFileWithRequiredFile',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/store/inventory',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractStoreApi',
+            'userClassname' => 'StoreApi',
+            'operationId' => 'getInventory',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/store/order',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractStoreApi',
+            'userClassname' => 'StoreApi',
+            'operationId' => 'placeOrder',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'DELETE',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/store/order/{order_id}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractStoreApi',
+            'userClassname' => 'StoreApi',
+            'operationId' => 'deleteOrder',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/store/order/{order_id}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractStoreApi',
+            'userClassname' => 'StoreApi',
+            'operationId' => 'getOrderById',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'createUser',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/createWithArray',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'createUsersWithArrayInput',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'POST',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/createWithList',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'createUsersWithListInput',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/login',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'loginUser',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/logout',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'logoutUser',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'DELETE',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/{username}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'deleteUser',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'GET',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/{username}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'getUserByName',
+            'authMethods' => [
+            ],
+        ],
+        [
+            'httpMethod' => 'PUT',
+            'basePathWithoutHost' => '/v2',
+            'path' => '/user/{username}',
+            'apiPackage' => 'OpenAPIServer\Api',
+            'classname' => 'AbstractUserApi',
+            'userClassname' => 'UserApi',
+            'operationId' => 'updateUser',
+            'authMethods' => [
+            ],
+        ],
+    ];
+
     /**
      * Class constructor
      *
@@ -62,7 +449,7 @@ class SlimRouter
      */
     public function __construct($container = [])
     {
-        $app = new App($container);
+        $this->slimApp = new App($container);
 
         $basicAuth = new HttpBasicAuthentication([
             "secure" => false,
@@ -73,150 +460,53 @@ class SlimRouter
             }
         ]);
 
-        $app->PATCH(
-            '/v2/another-fake/dummy',
-            AnotherFakeApi::class . ':call123TestSpecialTags'
-        );
-        $app->POST(
-            '/v2/fake/outer/boolean',
-            FakeApi::class . ':fakeOuterBooleanSerialize'
-        );
-        $app->POST(
-            '/v2/fake/outer/composite',
-            FakeApi::class . ':fakeOuterCompositeSerialize'
-        );
-        $app->POST(
-            '/v2/fake/outer/number',
-            FakeApi::class . ':fakeOuterNumberSerialize'
-        );
-        $app->POST(
-            '/v2/fake/outer/string',
-            FakeApi::class . ':fakeOuterStringSerialize'
-        );
-        $app->PUT(
-            '/v2/fake/body-with-file-schema',
-            FakeApi::class . ':testBodyWithFileSchema'
-        );
-        $app->PUT(
-            '/v2/fake/body-with-query-params',
-            FakeApi::class . ':testBodyWithQueryParams'
-        );
-        $app->PATCH(
-            '/v2/fake',
-            FakeApi::class . ':testClientModel'
-        );
-        $app->POST(
-            '/v2/fake',
-            FakeApi::class . ':testEndpointParameters'
-        )->add(
-            $basicAuth
-        );
-        $app->GET(
-            '/v2/fake',
-            FakeApi::class . ':testEnumParameters'
-        );
-        $app->DELETE(
-            '/v2/fake',
-            FakeApi::class . ':testGroupParameters'
-        );
-        $app->POST(
-            '/v2/fake/inline-additionalProperties',
-            FakeApi::class . ':testInlineAdditionalProperties'
-        );
-        $app->GET(
-            '/v2/fake/jsonFormData',
-            FakeApi::class . ':testJsonFormData'
-        );
-        $app->PATCH(
-            '/v2/fake_classname_test',
-            FakeClassnameTags123Api::class . ':testClassname'
-        );
-        $app->POST(
-            '/v2/pet',
-            PetApi::class . ':addPet'
-        );
-        $app->GET(
-            '/v2/pet/findByStatus',
-            PetApi::class . ':findPetsByStatus'
-        );
-        $app->GET(
-            '/v2/pet/findByTags',
-            PetApi::class . ':findPetsByTags'
-        );
-        $app->PUT(
-            '/v2/pet',
-            PetApi::class . ':updatePet'
-        );
-        $app->DELETE(
-            '/v2/pet/{petId}',
-            PetApi::class . ':deletePet'
-        );
-        $app->GET(
-            '/v2/pet/{petId}',
-            PetApi::class . ':getPetById'
-        );
-        $app->POST(
-            '/v2/pet/{petId}',
-            PetApi::class . ':updatePetWithForm'
-        );
-        $app->POST(
-            '/v2/pet/{petId}/uploadImage',
-            PetApi::class . ':uploadFile'
-        );
-        $app->POST(
-            '/v2/fake/{petId}/uploadImageWithRequiredFile',
-            PetApi::class . ':uploadFileWithRequiredFile'
-        );
-        $app->GET(
-            '/v2/store/inventory',
-            StoreApi::class . ':getInventory'
-        );
-        $app->POST(
-            '/v2/store/order',
-            StoreApi::class . ':placeOrder'
-        );
-        $app->DELETE(
-            '/v2/store/order/{order_id}',
-            StoreApi::class . ':deleteOrder'
-        );
-        $app->GET(
-            '/v2/store/order/{order_id}',
-            StoreApi::class . ':getOrderById'
-        );
-        $app->POST(
-            '/v2/user',
-            UserApi::class . ':createUser'
-        );
-        $app->POST(
-            '/v2/user/createWithArray',
-            UserApi::class . ':createUsersWithArrayInput'
-        );
-        $app->POST(
-            '/v2/user/createWithList',
-            UserApi::class . ':createUsersWithListInput'
-        );
-        $app->GET(
-            '/v2/user/login',
-            UserApi::class . ':loginUser'
-        );
-        $app->GET(
-            '/v2/user/logout',
-            UserApi::class . ':logoutUser'
-        );
-        $app->DELETE(
-            '/v2/user/{username}',
-            UserApi::class . ':deleteUser'
-        );
-        $app->GET(
-            '/v2/user/{username}',
-            UserApi::class . ':getUserByName'
-        );
-        $app->PUT(
-            '/v2/user/{username}',
-            UserApi::class . ':updateUser'
-        );
+        foreach ($this->operations as $operation) {
+            $callback = function ($request, $response, $arguments) use ($operation) {
+                $message = "How about extending {$operation['classname']} by {$operation['apiPackage']}\\{$operation['userClassname']} class implementing {$operation['operationId']} as a {$operation['httpMethod']} method?";
+                throw new \Exception($message);
+                return $response->withStatus(501)->write($message);
+            };
+            $middlewares = [];
 
-        $this->slimApp = $app;
+            if (class_exists("\\{$operation['apiPackage']}\\{$operation['userClassname']}")) {
+                $callback = "\\{$operation['apiPackage']}\\{$operation['userClassname']}:{$operation['operationId']}";
+            }
+
+
+            foreach ($operation['authMethods'] as $authMethod) {
+                if ($authMethod['type'] === 'http') {
+                    $middlewares[] = $basicAuth;
+                }
+            }
+
+            $this->addRoute(
+                [$operation['httpMethod']],
+                "{$operation['basePathWithoutHost']}{$operation['path']}",
+                $callback,
+                $middlewares
+            )->setName($operation['operationId']);
+        }
+    }
+
+    /**
+     * Add route with multiple methods
+     *
+     * @param string[]        $methods     Numeric array of HTTP method names
+     * @param string          $pattern     The route URI pattern
+     * @param callable|string $callable    The route callback routine
+     * @param array|null      $middlewares List of middlewares
+     *
+     * @return Slim\Interfaces\RouteInterface
+     *
+     * @throws InvalidArgumentException if the route pattern isn't a string
+     */
+    public function addRoute($methods, $pattern, $callable, $middlewares = [])
+    {
+        $route = $this->slimApp->map($methods, $pattern, $callable);
+        foreach ($middlewares as $middleware) {
+            $route->add($middleware);
+        }
+        return $route;
     }
 
     /**
diff --git a/samples/server/petstore/php-slim/test/Api/AnotherFakeApiTest.php b/samples/server/petstore/php-slim/test/Api/AnotherFakeApiTest.php
index a41b3878aa8..768b017a867 100644
--- a/samples/server/petstore/php-slim/test/Api/AnotherFakeApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/AnotherFakeApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\AnotherFakeApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\AnotherFakeApi
+ * @coversDefaultClass \OpenAPIServer\Api\AnotherFakeApi
  */
 class AnotherFakeApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/test/Api/FakeApiTest.php b/samples/server/petstore/php-slim/test/Api/FakeApiTest.php
index 76347875b33..5b5146ec853 100644
--- a/samples/server/petstore/php-slim/test/Api/FakeApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/FakeApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\FakeApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\FakeApi
+ * @coversDefaultClass \OpenAPIServer\Api\FakeApi
  */
 class FakeApiTest extends TestCase
 {
@@ -158,6 +158,16 @@ class FakeApiTest extends TestCase
     {
     }
 
+    /**
+     * Test case for testGroupParameters
+     *
+     * Fake endpoint to test group parameters (optional).
+     * @covers ::testGroupParameters
+     */
+    public function testTestGroupParameters()
+    {
+    }
+
     /**
      * Test case for testInlineAdditionalProperties
      *
diff --git a/samples/server/petstore/php-slim/test/Api/FakeClassnameTags123ApiTest.php b/samples/server/petstore/php-slim/test/Api/FakeClassnameTags123ApiTest.php
index 5fce14937ef..c64a2428151 100644
--- a/samples/server/petstore/php-slim/test/Api/FakeClassnameTags123ApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/FakeClassnameTags123ApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\FakeClassnameTags123Api;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\FakeClassnameTags123Api
+ * @coversDefaultClass \OpenAPIServer\Api\FakeClassnameTags123Api
  */
 class FakeClassnameTags123ApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/test/Api/PetApiTest.php b/samples/server/petstore/php-slim/test/Api/PetApiTest.php
index b6849de70b3..764761c9d7f 100644
--- a/samples/server/petstore/php-slim/test/Api/PetApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/PetApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\PetApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\PetApi
+ * @coversDefaultClass \OpenAPIServer\Api\PetApi
  */
 class PetApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/test/Api/StoreApiTest.php b/samples/server/petstore/php-slim/test/Api/StoreApiTest.php
index edc3c6a0e75..306e9e7e46b 100644
--- a/samples/server/petstore/php-slim/test/Api/StoreApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/StoreApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\StoreApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\StoreApi
+ * @coversDefaultClass \OpenAPIServer\Api\StoreApi
  */
 class StoreApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/test/Api/UserApiTest.php b/samples/server/petstore/php-slim/test/Api/UserApiTest.php
index a1d09015bb0..9dd3247ec8e 100644
--- a/samples/server/petstore/php-slim/test/Api/UserApiTest.php
+++ b/samples/server/petstore/php-slim/test/Api/UserApiTest.php
@@ -35,7 +35,7 @@ use OpenAPIServer\Api\UserApi;
  * @package  OpenAPIServer\Api
  * @author   OpenAPI Generator team
  * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\UserApi
+ * @coversDefaultClass \OpenAPIServer\Api\UserApi
  */
 class UserApiTest extends TestCase
 {
diff --git a/samples/server/petstore/php-slim/test/Model/AnimalFarmTest.php b/samples/server/petstore/php-slim/test/Model/AnimalFarmTest.php
deleted file mode 100644
index 7177a6d1a0e..00000000000
--- a/samples/server/petstore/php-slim/test/Model/AnimalFarmTest.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-/**
- * AnimalFarmTest
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer\Model
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-
-/**
- * OpenAPI Petstore
- *
- * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
- * OpenAPI spec version: 1.0.0
- * Generated by: https://github.com/openapitools/openapi-generator.git
- */
-
-/**
- * NOTE: This class is auto generated by the openapi generator program.
- * https://github.com/openapitools/openapi-generator
- * Please update the test case below to test the model.
- */
-namespace OpenAPIServer\Model;
-
-use PHPUnit\Framework\TestCase;
-use OpenAPIServer\Model\AnimalFarm;
-
-/**
- * AnimalFarmTest Class Doc Comment
- *
- * @category Class
- * @description AnimalFarm
- * @package  OpenAPIServer\Model
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\AnimalFarm
- */
-class AnimalFarmTest extends TestCase
-{
-
-    /**
-     * Setup before running any test cases
-     */
-    public static function setUpBeforeClass()
-    {
-    }
-
-    /**
-     * Setup before running each test case
-     */
-    public function setUp()
-    {
-    }
-
-    /**
-     * Clean up after running each test case
-     */
-    public function tearDown()
-    {
-    }
-
-    /**
-     * Clean up after running all test cases
-     */
-    public static function tearDownAfterClass()
-    {
-    }
-
-    /**
-     * Test "AnimalFarm"
-     */
-    public function testAnimalFarm()
-    {
-        $testAnimalFarm = new AnimalFarm();
-    }
-}
diff --git a/samples/server/petstore/php-slim/test/Model/StringBooleanMapTest.php b/samples/server/petstore/php-slim/test/Model/StringBooleanMapTest.php
deleted file mode 100644
index 151a34bb631..00000000000
--- a/samples/server/petstore/php-slim/test/Model/StringBooleanMapTest.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-/**
- * StringBooleanMapTest
- * PHP version 5
- *
- * @category Class
- * @package  OpenAPIServer\Model
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- */
-
-/**
- * OpenAPI Petstore
- *
- * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
- * OpenAPI spec version: 1.0.0
- * Generated by: https://github.com/openapitools/openapi-generator.git
- */
-
-/**
- * NOTE: This class is auto generated by the openapi generator program.
- * https://github.com/openapitools/openapi-generator
- * Please update the test case below to test the model.
- */
-namespace OpenAPIServer\Model;
-
-use PHPUnit\Framework\TestCase;
-use OpenAPIServer\Model\StringBooleanMap;
-
-/**
- * StringBooleanMapTest Class Doc Comment
- *
- * @category Class
- * @description StringBooleanMap
- * @package  OpenAPIServer\Model
- * @author   OpenAPI Generator team
- * @link     https://github.com/openapitools/openapi-generator
- * @coversDefaultClass \OpenAPIServer\Model\StringBooleanMap
- */
-class StringBooleanMapTest extends TestCase
-{
-
-    /**
-     * Setup before running any test cases
-     */
-    public static function setUpBeforeClass()
-    {
-    }
-
-    /**
-     * Setup before running each test case
-     */
-    public function setUp()
-    {
-    }
-
-    /**
-     * Clean up after running each test case
-     */
-    public function tearDown()
-    {
-    }
-
-    /**
-     * Clean up after running all test cases
-     */
-    public static function tearDownAfterClass()
-    {
-    }
-
-    /**
-     * Test "StringBooleanMap"
-     */
-    public function testStringBooleanMap()
-    {
-        $testStringBooleanMap = new StringBooleanMap();
-    }
-}