[Java] Deprecate feignVersion option (#6824)

* deprecate feign option

* update doc

* udpate samples

bin/configs/java-feign.yaml

@@ -1,9 +1,9 @@
 generatorName: java
-outputDir: samples/client/petstore/java/feign10x
+outputDir: samples/client/petstore/java/feign
 library: feign
 inputSpec: modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml
 templateDir: modules/openapi-generator/src/main/resources/Java
 additionalProperties:
   booleanGetterPrefix: is
-  artifactId: petstore-feign-10x
+  artifactId: petstore-feign
   hideGenerationTimestamp: "true"

docs/generators/java.md

@@ -25,14 +25,13 @@ sidebar_label: java
 |disallowAdditionalPropertiesIfNotPresent|Specify the behavior when the 'additionalProperties' keyword is not present in the OAS document. If false: the 'additionalProperties' implementation is compliant with the OAS and JSON schema specifications. If true: when the 'additionalProperties' keyword is not present in a schema, the value of 'additionalProperties' is set to false, i.e. no additional properties are allowed. Note: this mode is not compliant with the JSON schema specification. This is the original openapi-generator behavior.This setting is currently ignored for OAS 2.0 documents:  1) When the 'additionalProperties' keyword is not present in a 2.0 schema, additional properties are NOT allowed.  2) Boolean values of the 'additionalProperties' keyword are ignored. It's as if additional properties are NOT allowed.Note: the root cause are issues #1369 and #1371, which must be resolved in the swagger-parser project.|<dl><dt>**false**</dt><dd>The 'additionalProperties' implementation is compliant with the OAS and JSON schema specifications.</dd><dt>**true**</dt><dd>when the 'additionalProperties' keyword is not present in a schema, the value of 'additionalProperties' is automatically set to false, i.e. no additional properties are allowed. Note: this mode is not compliant with the JSON schema specification. This is the original openapi-generator behavior.</dd></dl>|true|
 |discriminatorCaseSensitive|Whether the discriminator value lookup should be case-sensitive or not. This option only works for Java API client| |true|
 |ensureUniqueParams|Whether to ensure parameter names are unique in an operation (rename parameters that are not).| |true|
-|feignVersion|Version of OpenFeign: '10.x' (default), '9.x' (deprecated)| |false|
 |fullJavaUtil|whether to use fully qualified name for classes under java.util. This option only works for Java API client| |false|
 |groupId|groupId in generated pom.xml| |org.openapitools|
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |false|
 |invokerPackage|root package for generated code| |org.openapitools.client|
 |java8|Use Java8 classes instead of third party equivalents. Starting in 5.x, JDK8 is the default and the support for JDK7, JDK6 has been dropped|<dl><dt>**true**</dt><dd>Use Java 8 classes such as Base64</dd><dt>**false**</dt><dd>Various third party libraries as needed</dd></dl>|true|
 |legacyDiscriminatorBehavior|This flag is used by OpenAPITools codegen to influence the processing of the discriminator attribute in OpenAPI documents. This flag has no impact if the OAS document does not use the discriminator attribute. The default value of this flag is set in each language-specific code generator (e.g. Python, Java, go...)using the method toModelName. Note to developers supporting a language generator in OpenAPITools; to fully support the discriminator attribute as defined in the OAS specification 3.x, language generators should set this flag to true by default; however this requires updating the mustache templates to generate a language-specific discriminator lookup function that iterates over {{#mappedModels}} and does not iterate over {{children}}, {{#anyOf}}, or {{#oneOf}}.|<dl><dt>**true**</dt><dd>The mapping in the discriminator includes descendent schemas that allOf inherit from self and the discriminator mapping schemas in the OAS document.</dd><dt>**false**</dt><dd>The mapping in the discriminator includes any descendent schemas that allOf inherit from self, any oneOf schemas, any anyOf schemas, any x-discriminator-values, and the discriminator mapping schemas in the OAS document AND Codegen validates that oneOf and anyOf schemas contain the required discriminator and throws an error if the discriminator is missing.</dd></dl>|true|
-|library|library template (sub-template) to use|<dl><dt>**jersey1**</dt><dd>HTTP client: Jersey client 1.19.x. JSON processing: Jackson 2.9.x. Enable Java6 support using '-DsupportJava6=true'. Enable gzip request encoding using '-DuseGzipFeature=true'. IMPORTANT NOTE: jersey 1.x is no longer actively maintained so please upgrade to 'jersey2' or other HTTP libaries instead.</dd><dt>**jersey2**</dt><dd>HTTP client: Jersey client 2.25.1. JSON processing: Jackson 2.9.x</dd><dt>**feign**</dt><dd>HTTP client: OpenFeign 9.x (deprecated) or 10.x (default). JSON processing: Jackson 2.9.x.</dd><dt>**okhttp-gson**</dt><dd>[DEFAULT] HTTP client: OkHttp 3.x. JSON processing: Gson 2.8.x. Enable Parcelable models on Android using '-DparcelableModel=true'. Enable gzip request encoding using '-DuseGzipFeature=true'.</dd><dt>**retrofit2**</dt><dd>HTTP client: OkHttp 3.x. JSON processing: Gson 2.x (Retrofit 2.3.0). Enable the RxJava adapter using '-DuseRxJava[2/3]=true'. (RxJava 1.x or 2.x or 3.x)</dd><dt>**resttemplate**</dt><dd>HTTP client: Spring RestTemplate 4.x. JSON processing: Jackson 2.9.x</dd><dt>**webclient**</dt><dd>HTTP client: Spring WebClient 5.x. JSON processing: Jackson 2.9.x</dd><dt>**resteasy**</dt><dd>HTTP client: Resteasy client 3.x. JSON processing: Jackson 2.9.x</dd><dt>**vertx**</dt><dd>HTTP client: VertX client 3.x. JSON processing: Jackson 2.9.x</dd><dt>**google-api-client**</dt><dd>HTTP client: Google API client 1.x. JSON processing: Jackson 2.9.x</dd><dt>**rest-assured**</dt><dd>HTTP client: rest-assured : 4.x. JSON processing: Gson 2.x or Jackson 2.10.x. Only for Java 8</dd><dt>**native**</dt><dd>HTTP client: Java native HttpClient. JSON processing: Jackson 2.9.x. Only for Java11+</dd><dt>**microprofile**</dt><dd>HTTP client: Microprofile client 1.x. JSON processing: Jackson 2.9.x</dd></dl>|okhttp-gson|
+|library|library template (sub-template) to use|<dl><dt>**jersey1**</dt><dd>HTTP client: Jersey client 1.19.x. JSON processing: Jackson 2.9.x. Enable Java6 support using '-DsupportJava6=true'. Enable gzip request encoding using '-DuseGzipFeature=true'. IMPORTANT NOTE: jersey 1.x is no longer actively maintained so please upgrade to 'jersey2' or other HTTP libaries instead.</dd><dt>**jersey2**</dt><dd>HTTP client: Jersey client 2.25.1. JSON processing: Jackson 2.9.x</dd><dt>**feign**</dt><dd>HTTP client: OpenFeign 11.x. JSON processing: Jackson 2.9.x.</dd><dt>**okhttp-gson**</dt><dd>[DEFAULT] HTTP client: OkHttp 3.x. JSON processing: Gson 2.8.x. Enable Parcelable models on Android using '-DparcelableModel=true'. Enable gzip request encoding using '-DuseGzipFeature=true'.</dd><dt>**retrofit2**</dt><dd>HTTP client: OkHttp 3.x. JSON processing: Gson 2.x (Retrofit 2.3.0). Enable the RxJava adapter using '-DuseRxJava[2/3]=true'. (RxJava 1.x or 2.x or 3.x)</dd><dt>**resttemplate**</dt><dd>HTTP client: Spring RestTemplate 4.x. JSON processing: Jackson 2.9.x</dd><dt>**webclient**</dt><dd>HTTP client: Spring WebClient 5.x. JSON processing: Jackson 2.9.x</dd><dt>**resteasy**</dt><dd>HTTP client: Resteasy client 3.x. JSON processing: Jackson 2.9.x</dd><dt>**vertx**</dt><dd>HTTP client: VertX client 3.x. JSON processing: Jackson 2.9.x</dd><dt>**google-api-client**</dt><dd>HTTP client: Google API client 1.x. JSON processing: Jackson 2.9.x</dd><dt>**rest-assured**</dt><dd>HTTP client: rest-assured : 4.x. JSON processing: Gson 2.x or Jackson 2.10.x. Only for Java 8</dd><dt>**native**</dt><dd>HTTP client: Java native HttpClient. JSON processing: Jackson 2.9.x. Only for Java11+</dd><dt>**microprofile**</dt><dd>HTTP client: Microprofile client 1.x. JSON processing: Jackson 2.9.x</dd></dl>|okhttp-gson|
 |licenseName|The name of the license| |Unlicense|
 |licenseUrl|The URL of the license| |http://unlicense.org|
 |modelPackage|package for generated models| |org.openapitools.client.model|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java

@@ -55,7 +55,6 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String DO_NOT_USE_RX = "doNotUseRx";
     public static final String USE_PLAY_WS = "usePlayWS";
     public static final String PLAY_VERSION = "playVersion";
-    public static final String FEIGN_VERSION = "feignVersion";
     public static final String ASYNC_NATIVE = "asyncNative";
     public static final String PARCELABLE_MODEL = "parcelableModel";
     public static final String USE_RUNTIME_EXCEPTION = "useRuntimeException";
@@ -66,9 +65,6 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String PLAY_25 = "play25";
     public static final String PLAY_26 = "play26";
 
-    public static final String FEIGN_9 = "9.x";
-    public static final String FEIGN_10 = "10.x";
-
     public static final String FEIGN = "feign";
     public static final String GOOGLE_API_CLIENT = "google-api-client";
     public static final String JERSEY1 = "jersey1";
@@ -95,7 +91,6 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     protected boolean doNotUseRx = true;
     protected boolean usePlayWS = false;
     protected String playVersion = PLAY_26;
-    protected String feignVersion = FEIGN_10;
     protected boolean asyncNative = false;
     protected boolean parcelableModel = false;
     protected boolean useBeanValidation = false;
@@ -143,13 +138,12 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         cliOptions.add(CliOption.newBoolean(USE_GZIP_FEATURE, "Send gzip-encoded requests"));
         cliOptions.add(CliOption.newBoolean(USE_RUNTIME_EXCEPTION, "Use RuntimeException instead of Exception"));
         cliOptions.add(CliOption.newBoolean(ASYNC_NATIVE, "If true, async handlers will be used, instead of the sync version"));
-        cliOptions.add(CliOption.newBoolean(FEIGN_VERSION, "Version of OpenFeign: '10.x' (default), '9.x' (deprecated)"));
         cliOptions.add(CliOption.newBoolean(USE_REFLECTION_EQUALS_HASHCODE, "Use org.apache.commons.lang3.builder for equals and hashCode in the models. WARNING: This will fail under a security manager, unless the appropriate permissions are set up correctly and also there's potential performance impact."));
         cliOptions.add(CliOption.newBoolean(CASE_INSENSITIVE_RESPONSE_HEADERS, "Make API response's headers case-insensitive. Available on " + OKHTTP_GSON + ", " + JERSEY2 + " libraries"));
 
         supportedLibraries.put(JERSEY1, "HTTP client: Jersey client 1.19.x. JSON processing: Jackson 2.9.x. Enable Java6 support using '-DsupportJava6=true'. Enable gzip request encoding using '-DuseGzipFeature=true'. IMPORTANT NOTE: jersey 1.x is no longer actively maintained so please upgrade to 'jersey2' or other HTTP libaries instead.");
         supportedLibraries.put(JERSEY2, "HTTP client: Jersey client 2.25.1. JSON processing: Jackson 2.9.x");
-        supportedLibraries.put(FEIGN, "HTTP client: OpenFeign 9.x (deprecated) or 10.x (default). JSON processing: Jackson 2.9.x.");
+        supportedLibraries.put(FEIGN, "HTTP client: OpenFeign 11.x. JSON processing: Jackson 2.9.x.");
         supportedLibraries.put(OKHTTP_GSON, "[DEFAULT] HTTP client: OkHttp 3.x. JSON processing: Gson 2.8.x. Enable Parcelable models on Android using '-DparcelableModel=true'. Enable gzip request encoding using '-DuseGzipFeature=true'.");
         supportedLibraries.put(RETROFIT_2, "HTTP client: OkHttp 3.x. JSON processing: Gson 2.x (Retrofit 2.3.0). Enable the RxJava adapter using '-DuseRxJava[2/3]=true'. (RxJava 1.x or 2.x or 3.x)");
         supportedLibraries.put(RESTTEMPLATE, "HTTP client: Spring RestTemplate 4.x. JSON processing: Jackson 2.9.x");
@@ -257,12 +251,6 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         }
         additionalProperties.put(PLAY_VERSION, playVersion);
 
-        // default to feign 10.x
-        if (additionalProperties.containsKey(FEIGN_VERSION)) {
-            once(LOGGER).warn("feignVersion has been deprecated. 10.x is the default.");
-        }
-        additionalProperties.put(FEIGN_VERSION, feignVersion);
-
         if (additionalProperties.containsKey(ASYNC_NATIVE)) {
             this.setAsyncNative(convertPropertyToBooleanAndWriteBack(ASYNC_NATIVE));
         }
@@ -845,10 +833,6 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         this.playVersion = playVersion;
     }
 
-    public void setFeignVersion(String feignVersion) {
-        this.feignVersion = feignVersion;
-    }
-
     public void setAsyncNative(boolean asyncNative) {
         this.asyncNative = asyncNative;
     }

modules/openapi-generator/src/main/resources/Java/libraries/feign/auth/OAuth.mustache

@@ -19,9 +19,7 @@ import org.apache.oltu.oauth2.common.message.types.GrantType;
 import org.apache.oltu.oauth2.common.token.BasicOAuthToken;
 
 import feign.Client;
-{{#useFeign10}}
 import feign.Request.HttpMethod;
-{{/useFeign10}}
 import feign.Request.Options;
 import feign.RequestInterceptor;
 import feign.RequestTemplate;
@@ -95,12 +93,7 @@ public class OAuth implements RequestInterceptor {
         try {
             accessTokenResponse = oauthClient.accessToken(tokenRequestBuilder.buildBodyMessage());
         } catch (Exception e) {
-            {{#useFeign10}}
             throw new RetryableException(0, e.getMessage(), HttpMethod.POST, e, null, template.request());
-            {{/useFeign10}}
-            {{^useFeign10}}
-            throw new RetryableException(e.getMessage(), e,null);
-            {{/useFeign10}}
         }
         if (accessTokenResponse != null && accessTokenResponse.getAccessToken() != null) {
             setAccessToken(accessTokenResponse.getAccessToken(), accessTokenResponse.getExpiresIn());

modules/openapi-generator/src/main/resources/Java/libraries/feign/build.gradle.mustache

@@ -126,8 +126,8 @@ ext {
     {{#threetenbp}}
     jackson_threetenbp_version = "2.9.10"
     {{/threetenbp}}
-    feign_version = "{{#useFeign10}}11.0{{/useFeign10}}{{^useFeign10}}9.7.0{{/useFeign10}}"
-    feign_form_version = "{{#useFeign10}}3.8.0{{/useFeign10}}{{^useFeign10}}2.1.0{{/useFeign10}}"
+    feign_version = "11.0"
+    feign_form_version = "3.8.0"
     junit_version = "4.13"
     oltu_version = "1.0.1"
 }

modules/openapi-generator/src/main/resources/Java/libraries/feign/build.sbt.mustache

@@ -10,10 +10,10 @@ lazy val root = (project in file(".")).
     resolvers += Resolver.mavenLocal,
     libraryDependencies ++= Seq(
       "io.swagger" % "swagger-annotations" % "1.5.24" % "compile",
-      "io.github.openfeign" % "feign-core" % "{{#useFeign10}}11.0{{/useFeign10}}{{^useFeign10}}9.7.0{{/useFeign10}}" % "compile",
-      "io.github.openfeign" % "feign-jackson" % "{{#useFeign10}}11.0{{/useFeign10}}{{^useFeign10}}9.7.0{{/useFeign10}}" % "compile",
-      "io.github.openfeign" % "feign-slf4j" % "{{#useFeign10}}11.0{{/useFeign10}}{{^useFeign10}}9.7.0{{/useFeign10}}" % "compile",
-      "io.github.openfeign.form" % "feign-form" % "{{#useFeign10}}3.8.0{{/useFeign10}}{{^useFeign10}}2.1.0{{/useFeign10}}" % "compile",
+      "io.github.openfeign" % "feign-core" % "11.0" % "compile",
+      "io.github.openfeign" % "feign-jackson" % "11.0" % "compile",
+      "io.github.openfeign" % "feign-slf4j" % "11.0" % "compile",
+      "io.github.openfeign.form" % "feign-form" % "3.8.0" % "compile",
       "com.fasterxml.jackson.core" % "jackson-core" % "2.10.3" % "compile",
       "com.fasterxml.jackson.core" % "jackson-annotations" % "2.10.3" % "compile",
       "com.fasterxml.jackson.core" % "jackson-databind" % "2.10.3" % "compile",

modules/openapi-generator/src/main/resources/Java/libraries/feign/pom.mustache

@@ -348,8 +348,8 @@
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <swagger-annotations-version>1.5.24</swagger-annotations-version>
-        <feign-version>{{#useFeign10}}11.0{{/useFeign10}}{{^useFeign10}}9.7.0{{/useFeign10}}</feign-version>
-        <feign-form-version>{{#useFeign10}}3.8.0{{/useFeign10}}{{^useFeign10}}2.1.0{{/useFeign10}}</feign-form-version>
+        <feign-version>11.0</feign-version>
+        <feign-form-version>3.8.0</feign-form-version>
         <jackson-version>2.10.3</jackson-version>
         <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
         <jackson-databind-version>2.10.3</jackson-databind-version>

pom.xml

@@ -731,7 +731,7 @@
                 </property>
             </activation>
             <modules>
-                <module>samples/client/petstore/java/feign10x</module>
+                <module>samples/client/petstore/java/feign</module>
             </modules>
         </profile>
         <profile>
@@ -1252,7 +1252,7 @@
                 <module>samples/client/petstore/scala-httpclient</module>
                 <module>samples/client/petstore/scalaz</module>
                 <module>samples/client/petstore/clojure</module>
-                <module>samples/client/petstore/java/feign10x</module>
+                <module>samples/client/petstore/java/feign</module>
                 <module>samples/client/petstore/java/jersey1</module>
                 <module>samples/client/petstore/java/jersey2-java8</module>
                 <module>samples/openapi3/client/petstore/java/jersey2-java8</module>

samples/client/petstore/java/feign/.openapi-generator-ignore

@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/petstore/java/feign/README.md

@@ -0,0 +1,43 @@
+# petstore-feign
+
+## Requirements
+
+Building the API client library requires [Maven](https://maven.apache.org/) to be installed.
+
+## Installation & Usage
+
+To install the API client library to your local Maven repository, simply execute:
+
+```shell
+mvn install
+```
+
+To deploy it to a remote Maven repository instead, configure the settings of the repository and execute:
+
+```shell
+mvn deploy
+```
+
+Refer to the [official documentation](https://maven.apache.org/plugins/maven-deploy-plugin/usage.html) for more information.
+
+After the client library is installed/deployed, you can use it in your Maven project by adding the following to your *pom.xml*:
+
+```xml
+<dependency>
+    <groupId>org.openapitools</groupId>
+    <artifactId>petstore-feign</artifactId>
+    <version>1.0.0</version>
+    <scope>compile</scope>
+</dependency>
+
+```
+
+## Recommendation
+
+It's recommended to create an instance of `ApiClient` per thread in a multithreaded environment to avoid any potential issues.
+
+## Author
+
+
+
+

samples/client/petstore/java/feign/build.gradle

@@ -0,0 +1,125 @@
+apply plugin: 'idea'
+apply plugin: 'eclipse'
+
+group = 'org.openapitools'
+version = '1.0.0'
+
+buildscript {
+    repositories {
+        maven { url "https://repo1.maven.org/maven2" }
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.3.+'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
+    }
+}
+
+repositories {
+    jcenter()
+}
+
+
+if(hasProperty('target') && target == 'android') {
+
+    apply plugin: 'com.android.library'
+    apply plugin: 'com.github.dcendents.android-maven'
+
+    android {
+        compileSdkVersion 25
+        buildToolsVersion '25.0.2'
+        defaultConfig {
+            minSdkVersion 14
+            targetSdkVersion 25
+        }
+        compileOptions {
+            sourceCompatibility JavaVersion.VERSION_1_7
+            targetCompatibility JavaVersion.VERSION_1_7
+        }
+
+        // Rename the aar correctly
+        libraryVariants.all { variant ->
+            variant.outputs.each { output ->
+                def outputFile = output.outputFile
+                if (outputFile != null && outputFile.name.endsWith('.aar')) {
+                    def fileName = "${project.name}-${variant.baseName}-${version}.aar"
+                    output.outputFile = new File(outputFile.parent, fileName)
+                }
+            }
+        }
+
+        dependencies {
+            provided 'javax.annotation:jsr250-api:1.0'
+        }
+    }
+
+    afterEvaluate {
+        android.libraryVariants.all { variant ->
+            def task = project.tasks.create "jar${variant.name.capitalize()}", Jar
+            task.description = "Create jar artifact for ${variant.name}"
+            task.dependsOn variant.javaCompile
+            task.from variant.javaCompile.destinationDir
+            task.destinationDir = project.file("${project.buildDir}/outputs/jar")
+            task.archiveName = "${project.name}-${variant.baseName}-${version}.jar"
+            artifacts.add('archives', task);
+        }
+    }
+
+    task sourcesJar(type: Jar) {
+        from android.sourceSets.main.java.srcDirs
+        classifier = 'sources'
+    }
+
+    artifacts {
+        archives sourcesJar
+    }
+
+} else {
+
+    apply plugin: 'java'
+    apply plugin: 'maven'
+
+    sourceCompatibility = JavaVersion.VERSION_1_7
+    targetCompatibility = JavaVersion.VERSION_1_7
+
+    install {
+        repositories.mavenInstaller {
+            pom.artifactId = 'petstore-feign'
+        }
+    }
+
+    task execute(type:JavaExec) {
+       main = System.getProperty('mainClass')
+       classpath = sourceSets.main.runtimeClasspath
+    }
+}
+
+ext {
+    swagger_annotations_version = "1.5.24"
+    jackson_version = "2.10.3"
+    jackson_databind_version = "2.10.3"
+    jackson_databind_nullable_version = "0.2.1"
+    jackson_threetenbp_version = "2.9.10"
+    feign_version = "11.0"
+    feign_form_version = "3.8.0"
+    junit_version = "4.13"
+    oltu_version = "1.0.1"
+}
+
+dependencies {
+    compile "io.swagger:swagger-annotations:$swagger_annotations_version"
+    compile "com.google.code.findbugs:jsr305:3.0.2"
+    compile "io.github.openfeign:feign-core:$feign_version"
+    compile "io.github.openfeign:feign-jackson:$feign_version"
+    compile "io.github.openfeign:feign-slf4j:$feign_version"
+    compile "io.github.openfeign.form:feign-form:$feign_form_version"
+    compile "com.fasterxml.jackson.core:jackson-core:$jackson_version"
+    compile "com.fasterxml.jackson.core:jackson-annotations:$jackson_version"
+    compile "com.fasterxml.jackson.core:jackson-databind:$jackson_databind_version"
+    compile "org.openapitools:jackson-databind-nullable:$jackson_databind_nullable_version"
+    compile "com.github.joschi.jackson:jackson-datatype-threetenbp:$jackson_threetenbp_version"
+    compile "org.apache.oltu.oauth2:org.apache.oltu.oauth2.client:$oltu_version"
+    compile "com.brsanthu:migbase64:2.2"
+    compile 'javax.annotation:javax.annotation-api:1.3.2'
+    testCompile "junit:junit:$junit_version"
+}

samples/client/petstore/java/feign/build.sbt

@@ -0,0 +1,28 @@
+lazy val root = (project in file(".")).
+  settings(
+    organization := "org.openapitools",
+    name := "petstore-feign",
+    version := "1.0.0",
+    scalaVersion := "2.11.4",
+    scalacOptions ++= Seq("-feature"),
+    javacOptions in compile ++= Seq("-Xlint:deprecation"),
+    publishArtifact in (Compile, packageDoc) := false,
+    resolvers += Resolver.mavenLocal,
+    libraryDependencies ++= Seq(
+      "io.swagger" % "swagger-annotations" % "1.5.24" % "compile",
+      "io.github.openfeign" % "feign-core" % "11.0" % "compile",
+      "io.github.openfeign" % "feign-jackson" % "11.0" % "compile",
+      "io.github.openfeign" % "feign-slf4j" % "11.0" % "compile",
+      "io.github.openfeign.form" % "feign-form" % "3.8.0" % "compile",
+      "com.fasterxml.jackson.core" % "jackson-core" % "2.10.3" % "compile",
+      "com.fasterxml.jackson.core" % "jackson-annotations" % "2.10.3" % "compile",
+      "com.fasterxml.jackson.core" % "jackson-databind" % "2.10.3" % "compile",
+      "com.fasterxml.jackson.datatype" % "jackson-datatype-joda" % "2.9.10" % "compile",
+      "com.github.joschi.jackson" % "jackson-datatype-threetenbp" % "2.9.10" % "compile",
+      "org.apache.oltu.oauth2" % "org.apache.oltu.oauth2.client" % "1.0.1" % "compile",
+      "com.brsanthu" % "migbase64" % "2.2" % "compile",
+      "javax.annotation" % "javax.annotation-api" % "1.3.2" % "compile",
+      "junit" % "junit" % "4.13" % "test",
+      "com.novocode" % "junit-interface" % "0.10" % "test"
+    )
+  )

samples/client/petstore/java/feign/feign10x/.gitignore

@@ -0,0 +1,21 @@
+*.class
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# exclude jar for gradle wrapper
+!gradle/wrapper/*.jar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# build files
+**/target
+target
+.gradle
+build

samples/client/petstore/java/feign/feign10x/.openapi-generator/FILES

@@ -0,0 +1,80 @@
+.gitignore
+.travis.yml
+README.md
+api/openapi.yaml
+build.gradle
+build.sbt
+git_push.sh
+gradle.properties
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+pom.xml
+settings.gradle
+src/main/AndroidManifest.xml
+src/main/java/org/openapitools/client/ApiClient.java
+src/main/java/org/openapitools/client/CustomInstantDeserializer.java
+src/main/java/org/openapitools/client/EncodingUtils.java
+src/main/java/org/openapitools/client/ParamExpander.java
+src/main/java/org/openapitools/client/RFC3339DateFormat.java
+src/main/java/org/openapitools/client/ServerConfiguration.java
+src/main/java/org/openapitools/client/ServerVariable.java
+src/main/java/org/openapitools/client/StringUtil.java
+src/main/java/org/openapitools/client/api/AnotherFakeApi.java
+src/main/java/org/openapitools/client/api/FakeApi.java
+src/main/java/org/openapitools/client/api/FakeClassnameTags123Api.java
+src/main/java/org/openapitools/client/api/PetApi.java
+src/main/java/org/openapitools/client/api/StoreApi.java
+src/main/java/org/openapitools/client/api/UserApi.java
+src/main/java/org/openapitools/client/auth/ApiKeyAuth.java
+src/main/java/org/openapitools/client/auth/HttpBasicAuth.java
+src/main/java/org/openapitools/client/auth/HttpBearerAuth.java
+src/main/java/org/openapitools/client/auth/OAuth.java
+src/main/java/org/openapitools/client/auth/OAuthFlow.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+src/main/java/org/openapitools/client/model/Animal.java
+src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+src/main/java/org/openapitools/client/model/ArrayTest.java
+src/main/java/org/openapitools/client/model/BigCat.java
+src/main/java/org/openapitools/client/model/BigCatAllOf.java
+src/main/java/org/openapitools/client/model/Capitalization.java
+src/main/java/org/openapitools/client/model/Cat.java
+src/main/java/org/openapitools/client/model/CatAllOf.java
+src/main/java/org/openapitools/client/model/Category.java
+src/main/java/org/openapitools/client/model/ClassModel.java
+src/main/java/org/openapitools/client/model/Client.java
+src/main/java/org/openapitools/client/model/Dog.java
+src/main/java/org/openapitools/client/model/DogAllOf.java
+src/main/java/org/openapitools/client/model/EnumArrays.java
+src/main/java/org/openapitools/client/model/EnumClass.java
+src/main/java/org/openapitools/client/model/EnumTest.java
+src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+src/main/java/org/openapitools/client/model/FormatTest.java
+src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+src/main/java/org/openapitools/client/model/MapTest.java
+src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+src/main/java/org/openapitools/client/model/Model200Response.java
+src/main/java/org/openapitools/client/model/ModelApiResponse.java
+src/main/java/org/openapitools/client/model/ModelReturn.java
+src/main/java/org/openapitools/client/model/Name.java
+src/main/java/org/openapitools/client/model/NumberOnly.java
+src/main/java/org/openapitools/client/model/Order.java
+src/main/java/org/openapitools/client/model/OuterComposite.java
+src/main/java/org/openapitools/client/model/OuterEnum.java
+src/main/java/org/openapitools/client/model/Pet.java
+src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+src/main/java/org/openapitools/client/model/SpecialModelName.java
+src/main/java/org/openapitools/client/model/Tag.java
+src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+src/main/java/org/openapitools/client/model/TypeHolderExample.java
+src/main/java/org/openapitools/client/model/User.java
+src/main/java/org/openapitools/client/model/XmlItem.java

samples/client/petstore/java/feign/feign10x/.openapi-generator/VERSION

@@ -0,0 +1 @@
+5.0.0-SNAPSHOT

samples/client/petstore/java/feign/feign10x/.travis.yml

@@ -0,0 +1,22 @@
+#
+# Generated by OpenAPI Generator: https://openapi-generator.tech
+#
+# Ref: https://docs.travis-ci.com/user/languages/java/
+#
+language: java
+jdk:
+  - openjdk12
+  - openjdk11
+  - openjdk10
+  - openjdk9
+  - openjdk8
+before_install:
+  # ensure gradlew has proper permission
+  - chmod a+x ./gradlew
+script:
+  # test using maven
+  #- mvn test
+  # test using gradle
+  - gradle test
+  # test using sbt 
+  # - sbt test