From 21657f80cf1ee2d96f832008170617672b314690 Mon Sep 17 00:00:00 2001
From: eblis <eblis102@gmail.com>
Date: Mon, 20 Mar 2017 16:12:29 +0200
Subject: [PATCH] Not using files from template folders with libraries inside
 them (#4628)

* #4627 - When looking for template files also look in the libraries subfolder of the supplied templateFolder, before checking the embedded locations.

* Reworked the order in which template files are searched for:
 - 1st the code will check if there's a <template folder>/libraries/<library> folder containing the file
 - 2nd it will check for the file in the specified <template folder> folder
 - 3rd it will check if there's an <embedded template>/libraries/<library> folder containing the file
 - 4th and last it will assume the file is in <embedded template> folder.

 Added unit test to test template dir overloading.
---
 .../io/swagger/codegen/AbstractGenerator.java |  48 +-
 .../swagger/codegen/DefaultGeneratorTest.java |  59 ++
 .../2_0/templates/Java/ApiClient.mustache     | 725 +++++++++++++++++
 .../Java/libraries/jersey2/ApiClient.mustache | 770 ++++++++++++++++++
 .../Java/libraries/jersey2/JSON.mustache      |  50 ++
 .../Java/libraries/jersey2/api.mustache       | 105 +++
 .../libraries/jersey2/build.gradle.mustache   | 144 ++++
 .../Java/libraries/jersey2/build.sbt.mustache |  36 +
 .../Java/libraries/jersey2/pom.mustache       | 289 +++++++
 .../2_0/templates/Java/model.mustache         |  31 +
 10 files changed, 2243 insertions(+), 14 deletions(-)
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/ApiClient.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/ApiClient.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/JSON.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/api.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.gradle.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.sbt.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/pom.mustache
 create mode 100644 modules/swagger-codegen/src/test/resources/2_0/templates/Java/model.mustache

diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/AbstractGenerator.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/AbstractGenerator.java
index abf77b59cb1..234cdaeef45 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/AbstractGenerator.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/AbstractGenerator.java
@@ -13,6 +13,7 @@ import java.io.Writer;
 import java.util.Scanner;
 import java.util.regex.Pattern;
 
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -63,6 +64,10 @@ public abstract class AbstractGenerator {
         throw new RuntimeException("can't load template " + name);
     }
 
+    private String buildLibraryFilePath(String dir, String library, String file) {
+        return dir + File.separator + "libraries" + File.separator + library + File.separator + file;
+    }
+
     /**
      * Get the template file path with template dir prepended, and use the
      * library template if exists.
@@ -72,23 +77,38 @@ public abstract class AbstractGenerator {
      * @return String Full template file path
      */
     public String getFullTemplateFile(CodegenConfig config, String templateFile) {
-        String template = config.templateDir() + File.separator + templateFile;
+        //1st the code will check if there's a <template folder>/libraries/<library> folder containing the file
+        //2nd it will check for the file in the specified <template folder> folder
+        //3rd it will check if there's an <embedded template>/libraries/<library> folder containing the file
+        //4th and last it will assume the file is in <embedded template> folder.
+
+        //check the supplied template library folder for the file
+        final String library = config.getLibrary();
+        if (StringUtils.isNotEmpty(library)) {
+            //look for the file in the library subfolder of the supplied template
+            final String libTemplateFile = buildLibraryFilePath(config.templateDir(), library, templateFile);
+            if (new File(libTemplateFile).exists()) {
+                return libTemplateFile;
+            }
+        }
+
+        //check the supplied template main folder for the file
+        final String template = config.templateDir() + File.separator + templateFile;
         if (new File(template).exists()) {
             return template;
-        } else {
-            String library = config.getLibrary();
-            if (library != null && !"".equals(library)) {
-                String libTemplateFile = config.embeddedTemplateDir() + File.separator +
-                    "libraries" + File.separator + library + File.separator +
-                    templateFile;
-                if (embeddedTemplateExists(libTemplateFile)) {
-                    // Fall back to the template file embedded/packaged in the JAR file...
-                    return libTemplateFile;
-                }
-            }
-            // Fall back to the template file embedded/packaged in the JAR file...
-            return config.embeddedTemplateDir() + File.separator + templateFile;
         }
+
+        //try the embedded template library folder next
+        if (StringUtils.isNotEmpty(library)) {
+            final String embeddedLibTemplateFile = buildLibraryFilePath(config.embeddedTemplateDir(), library, templateFile);
+            if (embeddedTemplateExists(embeddedLibTemplateFile)) {
+                // Fall back to the template file embedded/packaged in the JAR file library folder...
+                return embeddedLibTemplateFile;
+            }
+        }
+            
+        // Fall back to the template file embedded/packaged in the JAR file...
+        return config.embeddedTemplateDir() + File.separator + templateFile;
     }
 
     public String readResourceContents(String resourceFilePath) {
diff --git a/modules/swagger-codegen/src/test/java/io/swagger/codegen/DefaultGeneratorTest.java b/modules/swagger-codegen/src/test/java/io/swagger/codegen/DefaultGeneratorTest.java
index f05c0e32700..9f66283fbde 100644
--- a/modules/swagger-codegen/src/test/java/io/swagger/codegen/DefaultGeneratorTest.java
+++ b/modules/swagger-codegen/src/test/java/io/swagger/codegen/DefaultGeneratorTest.java
@@ -4,18 +4,22 @@ import io.swagger.codegen.languages.JavaClientCodegen;
 import io.swagger.models.Swagger;
 import io.swagger.parser.SwaggerParser;
 import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.junit.rules.TemporaryFolder;
 import org.testng.annotations.AfterMethod;
 import org.testng.annotations.BeforeMethod;
 import org.testng.annotations.Test;
 
 import java.io.*;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import static io.swagger.codegen.CodegenConstants.TEMPLATE_DIR;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.fail;
 import static org.testng.Assert.*;
@@ -28,6 +32,11 @@ public class DefaultGeneratorTest {
     private static final String TEST_SKIP_OVERWRITE = "testSkipOverwrite";
     private static final String POM_FILE = "pom.xml";
     private static final String MODEL_ORDER_FILE = "/src/main/java/io/swagger/client/model/Order.java";
+    private static final String API_CLIENT_FILE = "/src/main/java/io/swagger/client/ApiClient.java";
+    private static final String BUILD_GRADLE_FILE = "build.gradle";
+
+    private static final String LIBRARY_COMMENT = "//overloaded template file within library folder to add this comment";
+    private static final String TEMPLATE_COMMENT = "//overloaded main template file to add this comment";
 
     public TemporaryFolder folder = new TemporaryFolder();
 
@@ -198,6 +207,56 @@ public class DefaultGeneratorTest {
 //        assertTrue(pom.exists());
     }
 
+    private boolean containsOverloadedComments(File file, String ...search) throws IOException {
+        for (String line : Files.readAllLines(file.toPath(), Charset.defaultCharset())) {
+            if (StringUtils.containsAny(line, search)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    @Test
+    public void testOverloadingTemplateFiles() throws Exception {
+        final File output = folder.getRoot();
+
+        final Swagger swagger = new SwaggerParser().read("src/test/resources/petstore.json");
+        CodegenConfig codegenConfig = new JavaClientCodegen();
+        codegenConfig.setLibrary("jersey2");
+        codegenConfig.setOutputDir(output.getAbsolutePath());
+
+        ClientOptInput clientOptInput = new ClientOptInput().opts(new ClientOpts()).swagger(swagger).config(codegenConfig);
+        //generate content first time without specifying an overloaded template file, so the default mustache files are used instead
+        new DefaultGenerator().opts(clientOptInput).generate();
+
+        final File order = new File(output, MODEL_ORDER_FILE);
+        assertTrue(order.exists());
+        assertFalse(containsOverloadedComments(order, TEMPLATE_COMMENT, LIBRARY_COMMENT));
+
+        final File gradle = new File(output, BUILD_GRADLE_FILE);
+        assertTrue(gradle.exists());
+        assertFalse(containsOverloadedComments(gradle, TEMPLATE_COMMENT, LIBRARY_COMMENT));
+
+        final File apiClient = new File(output, API_CLIENT_FILE);
+        assertTrue(apiClient.exists());
+        assertFalse(containsOverloadedComments(apiClient, TEMPLATE_COMMENT, LIBRARY_COMMENT));
+
+        codegenConfig.additionalProperties().put(TEMPLATE_DIR, "src/test/resources/2_0/templates/Java");
+        //generate content second time while specifying a template folder, so the files from the template are used instead
+        new DefaultGenerator().opts(clientOptInput).generate();
+
+        //this file won't contain the library comment because Jersey2 doesn't override the model template
+        assertTrue(order.exists());
+        assertTrue(containsOverloadedComments(order, TEMPLATE_COMMENT));
+
+        assertTrue(gradle.exists());
+        assertTrue(containsOverloadedComments(gradle, LIBRARY_COMMENT));
+
+        assertTrue(apiClient.exists());
+        assertTrue(containsOverloadedComments(apiClient, LIBRARY_COMMENT));
+    }
+
     @Test
     public void testGenerateUniqueOperationIds() {
         final File output = folder.getRoot();
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/ApiClient.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/ApiClient.mustache
new file mode 100644
index 00000000000..fa5ff8676e8
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/ApiClient.mustache
@@ -0,0 +1,725 @@
+//overloaded main template file to add this comment
+
+{{>licenseInfo}}
+package {{invokerPackage}};
+
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.databind.*;
+{{#java8}}
+import com.fasterxml.jackson.datatype.jsr310.*;
+{{/java8}}
+{{^java8}}
+import com.fasterxml.jackson.datatype.joda.*;
+{{/java8}}
+import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.GenericType;
+import com.sun.jersey.api.client.config.DefaultClientConfig;
+import com.sun.jersey.api.client.filter.LoggingFilter;
+import com.sun.jersey.api.client.WebResource.Builder;
+
+import com.sun.jersey.multipart.FormDataMultiPart;
+import com.sun.jersey.multipart.file.FileDataBodyPart;
+
+import javax.ws.rs.core.Response.Status.Family;
+import javax.ws.rs.core.MediaType;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.HashMap;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.TimeZone;
+
+import java.net.URLEncoder;
+
+import java.io.File;
+import java.io.UnsupportedEncodingException;
+
+import java.text.DateFormat;
+
+import {{invokerPackage}}.auth.Authentication;
+import {{invokerPackage}}.auth.HttpBasicAuth;
+import {{invokerPackage}}.auth.ApiKeyAuth;
+import {{invokerPackage}}.auth.OAuth;
+
+{{>generatedAnnotation}}
+public class ApiClient {
+  private Map<String, String> defaultHeaderMap = new HashMap<String, String>();
+  private String basePath = "{{basePath}}";
+  private boolean debugging = false;
+  private int connectionTimeout = 0;
+
+  private Client httpClient;
+  private ObjectMapper objectMapper;
+
+  private Map<String, Authentication> authentications;
+
+  private int statusCode;
+  private Map<String, List<String>> responseHeaders;
+
+  private DateFormat dateFormat;
+
+  public ApiClient() {
+    objectMapper = new ObjectMapper();
+    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+    objectMapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
+    objectMapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
+    {{#java8}}
+    objectMapper.registerModule(new JavaTimeModule());
+    {{/java8}}
+    {{^java8}}
+    objectMapper.registerModule(new JodaModule());
+    {{/java8}}
+    objectMapper.setDateFormat(ApiClient.buildDefaultDateFormat());
+
+    dateFormat = ApiClient.buildDefaultDateFormat();
+
+    // Set default User-Agent.
+    setUserAgent("{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}Swagger-Codegen/{{{artifactVersion}}}/java{{/httpUserAgent}}");
+
+    // Setup authentications (key: authentication name, value: authentication).
+    authentications = new HashMap<String, Authentication>();{{#authMethods}}{{#isBasic}}
+    authentications.put("{{name}}", new HttpBasicAuth());{{/isBasic}}{{#isApiKey}}
+    authentications.put("{{name}}", new ApiKeyAuth({{#isKeyInHeader}}"header"{{/isKeyInHeader}}{{^isKeyInHeader}}"query"{{/isKeyInHeader}}, "{{keyParamName}}"));{{/isApiKey}}{{#isOAuth}}
+    authentications.put("{{name}}", new OAuth());{{/isOAuth}}{{/authMethods}}
+    // Prevent the authentications from being modified.
+    authentications = Collections.unmodifiableMap(authentications);
+
+    rebuildHttpClient();
+  }
+
+  public static DateFormat buildDefaultDateFormat() {
+    return new RFC3339DateFormat();
+  }
+
+  /**
+   * Build the Client used to make HTTP requests with the latest settings,
+   * i.e. objectMapper and debugging.
+   * TODO: better to use the Builder Pattern?
+   * @return API client
+   */
+  public ApiClient rebuildHttpClient() {
+    // Add the JSON serialization support to Jersey
+    JacksonJsonProvider jsonProvider = new JacksonJsonProvider(objectMapper);
+    DefaultClientConfig conf = new DefaultClientConfig();
+    conf.getSingletons().add(jsonProvider);
+    Client client = Client.create(conf);
+    if (debugging) {
+      client.addFilter(new LoggingFilter());
+    }
+    this.httpClient = client;
+    return this;
+  }
+
+  /**
+   * Returns the current object mapper used for JSON serialization/deserialization.
+   * <p>
+   * Note: If you make changes to the object mapper, remember to set it back via
+   * <code>setObjectMapper</code> in order to trigger HTTP client rebuilding.
+   * </p>
+   * @return Object mapper
+   */
+  public ObjectMapper getObjectMapper() {
+    return objectMapper;
+  }
+
+  public ApiClient setObjectMapper(ObjectMapper objectMapper) {
+    this.objectMapper = objectMapper;
+    // Need to rebuild the Client as it depends on object mapper.
+    rebuildHttpClient();
+    return this;
+  }
+
+  public Client getHttpClient() {
+    return httpClient;
+  }
+
+  public ApiClient setHttpClient(Client httpClient) {
+    this.httpClient = httpClient;
+    return this;
+  }
+
+  public String getBasePath() {
+    return basePath;
+  }
+
+  public ApiClient setBasePath(String basePath) {
+    this.basePath = basePath;
+    return this;
+  }
+
+  /**
+   * Gets the status code of the previous request
+   * @return Status code
+   */
+  public int getStatusCode() {
+    return statusCode;
+  }
+
+  /**
+   * Gets the response headers of the previous request
+   * @return Response headers
+   */
+  public Map<String, List<String>> getResponseHeaders() {
+    return responseHeaders;
+  }
+
+  /**
+   * Get authentications (key: authentication name, value: authentication).
+   * @return Map of authentication
+   */
+  public Map<String, Authentication> getAuthentications() {
+    return authentications;
+  }
+
+  /**
+   * Get authentication for the given name.
+   *
+   * @param authName The authentication name
+   * @return The authentication, null if not found
+   */
+  public Authentication getAuthentication(String authName) {
+    return authentications.get(authName);
+  }
+
+  /**
+   * Helper method to set username for the first HTTP basic authentication.
+   * @param username Username
+   */
+  public void setUsername(String username) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBasicAuth) {
+        ((HttpBasicAuth) auth).setUsername(username);
+        return;
+      }
+    }
+    throw new RuntimeException("No HTTP basic authentication configured!");
+  }
+
+  /**
+   * Helper method to set password for the first HTTP basic authentication.
+   * @param password Password
+   */
+  public void setPassword(String password) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBasicAuth) {
+        ((HttpBasicAuth) auth).setPassword(password);
+        return;
+      }
+    }
+    throw new RuntimeException("No HTTP basic authentication configured!");
+  }
+
+  /**
+   * Helper method to set API key value for the first API key authentication.
+   * @param apiKey API key
+   */
+  public void setApiKey(String apiKey) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof ApiKeyAuth) {
+        ((ApiKeyAuth) auth).setApiKey(apiKey);
+        return;
+      }
+    }
+    throw new RuntimeException("No API key authentication configured!");
+  }
+
+  /**
+   * Helper method to set API key prefix for the first API key authentication.
+   * @param apiKeyPrefix API key prefix
+   */
+  public void setApiKeyPrefix(String apiKeyPrefix) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof ApiKeyAuth) {
+        ((ApiKeyAuth) auth).setApiKeyPrefix(apiKeyPrefix);
+        return;
+      }
+    }
+    throw new RuntimeException("No API key authentication configured!");
+  }
+
+  /**
+   * Helper method to set access token for the first OAuth2 authentication.
+   * @param accessToken Access token
+   */
+  public void setAccessToken(String accessToken) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof OAuth) {
+        ((OAuth) auth).setAccessToken(accessToken);
+        return;
+      }
+    }
+    throw new RuntimeException("No OAuth2 authentication configured!");
+  }
+
+  /**
+   * Set the User-Agent header's value (by adding to the default header map).
+   * @param userAgent User agent
+   * @return API client
+   */
+  public ApiClient setUserAgent(String userAgent) {
+    addDefaultHeader("User-Agent", userAgent);
+    return this;
+  }
+
+  /**
+   * Add a default header.
+   *
+   * @param key The header's key
+   * @param value The header's value
+   * @return API client
+   */
+  public ApiClient addDefaultHeader(String key, String value) {
+    defaultHeaderMap.put(key, value);
+    return this;
+  }
+
+  /**
+   * Check that whether debugging is enabled for this API client.
+   * @return True if debugging is on
+   */
+  public boolean isDebugging() {
+    return debugging;
+  }
+
+  /**
+   * Enable/disable debugging for this API client.
+   *
+   * @param debugging To enable (true) or disable (false) debugging
+   * @return API client
+   */
+  public ApiClient setDebugging(boolean debugging) {
+    this.debugging = debugging;
+    // Need to rebuild the Client as it depends on the value of debugging.
+    rebuildHttpClient();
+    return this;
+  }
+
+  /**
+   * Connect timeout (in milliseconds).
+   * @return Connection timeout
+   */
+  public int getConnectTimeout() {
+    return connectionTimeout;
+  }
+
+  /**
+   * Set the connect timeout (in milliseconds).
+   * A value of 0 means no timeout, otherwise values must be between 1 and
+   * {@link Integer#MAX_VALUE}.
+   * @param connectionTimeout Connection timeout in milliseconds
+   * @return API client
+   */
+   public ApiClient setConnectTimeout(int connectionTimeout) {
+     this.connectionTimeout = connectionTimeout;
+     httpClient.setConnectTimeout(connectionTimeout);
+     return this;
+   }
+
+  /**
+   * Get the date format used to parse/format date parameters.
+   * @return Date format
+   */
+  public DateFormat getDateFormat() {
+    return dateFormat;
+  }
+
+  /**
+   * Set the date format used to parse/format date parameters.
+   * @param dateFormat Date format
+   * @return API client
+   */
+  public ApiClient setDateFormat(DateFormat dateFormat) {
+    this.dateFormat = dateFormat;
+    // Also set the date format for model (de)serialization with Date properties.
+    this.objectMapper.setDateFormat((DateFormat) dateFormat.clone());
+    // Need to rebuild the Client as objectMapper changes.
+    rebuildHttpClient();
+    return this;
+  }
+
+  /**
+   * Parse the given string into Date object.
+   * @param str String
+   * @return Date
+   */
+  public Date parseDate(String str) {
+    try {
+      return dateFormat.parse(str);
+    } catch (java.text.ParseException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  /**
+   * Format the given Date object into string.
+   * @param date Date
+   * @return Date in string format
+   */
+  public String formatDate(Date date) {
+    return dateFormat.format(date);
+  }
+
+  /**
+   * Format the given parameter object into string.
+   * @param param Object
+   * @return Object in string format
+   */
+  public String parameterToString(Object param) {
+    if (param == null) {
+      return "";
+    } else if (param instanceof Date) {
+      return formatDate((Date) param);
+    } else if (param instanceof Collection) {
+      StringBuilder b = new StringBuilder();
+      for(Object o : (Collection<?>)param) {
+        if(b.length() > 0) {
+          b.append(',');
+        }
+        b.append(String.valueOf(o));
+      }
+      return b.toString();
+    } else {
+      return String.valueOf(param);
+    }
+  }
+
+  /*
+   * Format to {@code Pair} objects.
+   * @param collectionFormat Collection format
+   * @param name Name
+   * @param value Value
+   * @return List of pair
+   */
+  public List<Pair> parameterToPairs(String collectionFormat, String name, Object value){
+    List<Pair> params = new ArrayList<Pair>();
+
+    // preconditions
+    if (name == null || name.isEmpty() || value == null) return params;
+
+    Collection<?> valueCollection;
+    if (value instanceof Collection<?>) {
+      valueCollection = (Collection<?>) value;
+    } else {
+      params.add(new Pair(name, parameterToString(value)));
+      return params;
+    }
+
+    if (valueCollection.isEmpty()){
+      return params;
+    }
+
+    // get the collection format
+    String format = (collectionFormat == null || collectionFormat.isEmpty() ? "csv" : collectionFormat); // default: csv
+
+    // create the params based on the collection format
+    if ("multi".equals(format)) {
+      for (Object item : valueCollection) {
+        params.add(new Pair(name, parameterToString(item)));
+      }
+
+      return params;
+    }
+
+    String delimiter = ",";
+
+    if ("csv".equals(format)) {
+      delimiter = ",";
+    } else if ("ssv".equals(format)) {
+      delimiter = " ";
+    } else if ("tsv".equals(format)) {
+      delimiter = "\t";
+    } else if ("pipes".equals(format)) {
+      delimiter = "|";
+    }
+
+    StringBuilder sb = new StringBuilder() ;
+    for (Object item : valueCollection) {
+      sb.append(delimiter);
+      sb.append(parameterToString(item));
+    }
+
+    params.add(new Pair(name, sb.substring(1)));
+
+    return params;
+  }
+
+  /**
+   * Check if the given MIME is a JSON MIME.
+   * JSON MIME examples:
+   *   application/json
+   *   application/json; charset=UTF8
+   *   APPLICATION/JSON
+   * @param mime MIME
+   * @return True if MIME type is boolean
+   */
+  public boolean isJsonMime(String mime) {
+    return mime != null && mime.matches("(?i)application\\/json(;.*)?");
+  }
+
+  /**
+   * Select the Accept header's value from the given accepts array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use all of them (joining into a string)
+   *
+   * @param accepts The accepts array to select from
+   * @return The Accept header to use. If the given array is empty,
+   *   null will be returned (not to set the Accept header explicitly).
+   */
+  public String selectHeaderAccept(String[] accepts) {
+    if (accepts.length == 0) {
+      return null;
+    }
+    for (String accept : accepts) {
+      if (isJsonMime(accept)) {
+        return accept;
+      }
+    }
+    return StringUtil.join(accepts, ",");
+  }
+
+  /**
+   * Select the Content-Type header's value from the given array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use the first one of the array.
+   *
+   * @param contentTypes The Content-Type array to select from
+   * @return The Content-Type header to use. If the given array is empty,
+   *   JSON will be used.
+   */
+  public String selectHeaderContentType(String[] contentTypes) {
+    if (contentTypes.length == 0) {
+      return "application/json";
+    }
+    for (String contentType : contentTypes) {
+      if (isJsonMime(contentType)) {
+        return contentType;
+      }
+    }
+    return contentTypes[0];
+  }
+
+  /**
+   * Escape the given string to be used as URL query value.
+   * @param str String
+   * @return Escaped string
+   */
+  public String escapeString(String str) {
+    try {
+      return URLEncoder.encode(str, "utf8").replaceAll("\\+", "%20");
+    } catch (UnsupportedEncodingException e) {
+      return str;
+    }
+  }
+
+  /**
+   * Serialize the given Java object into string according the given
+   * Content-Type (only JSON is supported for now).
+   * @param obj Object
+   * @param contentType Content type
+   * @param formParams Form parameters
+   * @return Object
+   * @throws ApiException API exception
+   */
+  public Object serialize(Object obj, String contentType, Map<String, Object> formParams) throws ApiException {
+    if (contentType.startsWith("multipart/form-data")) {
+      FormDataMultiPart mp = new FormDataMultiPart();
+      for (Entry<String, Object> param: formParams.entrySet()) {
+        if( param.getValue() instanceof List && !( ( List ) param.getValue() ).isEmpty()
+                  && ( ( List ) param.getValue() ).get( 0 ) instanceof File ) {
+            @SuppressWarnings( "unchecked" )
+            List<File> files = ( List<File> ) param.getValue();
+            for( File file : files ) {
+              mp.bodyPart( new FileDataBodyPart( param.getKey(), file, MediaType.APPLICATION_OCTET_STREAM_TYPE ) );
+            }
+        } else if (param.getValue() instanceof File) {
+          File file = (File) param.getValue();
+          mp.bodyPart(new FileDataBodyPart(param.getKey(), file, MediaType.APPLICATION_OCTET_STREAM_TYPE));
+        } else {
+          mp.field(param.getKey(), parameterToString(param.getValue()), MediaType.MULTIPART_FORM_DATA_TYPE);
+        }
+      }
+      return mp;
+    } else if (contentType.startsWith("application/x-www-form-urlencoded")) {
+      return this.getXWWWFormUrlencodedParams(formParams);
+    } else {
+      // We let Jersey attempt to serialize the body
+      return obj;
+    }
+  }
+
+  /**
+   * Build full URL by concatenating base path, the given sub path and query parameters.
+   *
+   * @param path The sub path
+   * @param queryParams The query parameters
+   * @return The full URL
+   */
+  private String buildUrl(String path, List<Pair> queryParams) {
+    final StringBuilder url = new StringBuilder();
+    url.append(basePath).append(path);
+
+    if (queryParams != null && !queryParams.isEmpty()) {
+      // support (constant) query string in `path`, e.g. "/posts?draft=1"
+      String prefix = path.contains("?") ? "&" : "?";
+      for (Pair param : queryParams) {
+        if (param.getValue() != null) {
+          if (prefix != null) {
+            url.append(prefix);
+            prefix = null;
+          } else {
+            url.append("&");
+          }
+          String value = parameterToString(param.getValue());
+          url.append(escapeString(param.getName())).append("=").append(escapeString(value));
+        }
+      }
+    }
+
+    return url.toString();
+  }
+
+  private ClientResponse getAPIResponse(String path, String method, List<Pair> queryParams, Object body, Map<String, String> headerParams, Map<String, Object> formParams, String accept, String contentType, String[] authNames) throws ApiException {
+    if (body != null && !formParams.isEmpty()) {
+      throw new ApiException(500, "Cannot have body and form params");
+    }
+
+    updateParamsForAuth(authNames, queryParams, headerParams);
+
+    final String url = buildUrl(path, queryParams);
+    Builder builder;
+    if (accept == null) {
+      builder = httpClient.resource(url).getRequestBuilder();
+    } else {
+      builder = httpClient.resource(url).accept(accept);
+    }
+
+    for (String key : headerParams.keySet()) {
+      builder = builder.header(key, headerParams.get(key));
+    }
+    for (String key : defaultHeaderMap.keySet()) {
+      if (!headerParams.containsKey(key)) {
+        builder = builder.header(key, defaultHeaderMap.get(key));
+      }
+    }
+
+    ClientResponse response = null;
+
+    if ("GET".equals(method)) {
+      response = (ClientResponse) builder.get(ClientResponse.class);
+    } else if ("POST".equals(method)) {
+      response = builder.type(contentType).post(ClientResponse.class, serialize(body, contentType, formParams));
+    } else if ("PUT".equals(method)) {
+      response = builder.type(contentType).put(ClientResponse.class, serialize(body, contentType, formParams));
+    } else if ("DELETE".equals(method)) {
+      response = builder.type(contentType).delete(ClientResponse.class, serialize(body, contentType, formParams));
+    } else if ("PATCH".equals(method)) {
+      response = builder.type(contentType).header("X-HTTP-Method-Override", "PATCH").post(ClientResponse.class, serialize(body, contentType, formParams));
+    }
+    else {
+      throw new ApiException(500, "unknown method type " + method);
+    }
+    return response;
+  }
+
+  /**
+   * Invoke API by sending HTTP request with the given options.
+   *
+   * @param <T> Type
+   * @param path The sub-path of the HTTP URL
+   * @param method The request method, one of "GET", "POST", "PUT", and "DELETE"
+   * @param queryParams The query parameters
+   * @param body The request body object - if it is not binary, otherwise null
+   * @param headerParams The header parameters
+   * @param formParams The form parameters
+   * @param accept The request's Accept header
+   * @param contentType The request's Content-Type header
+   * @param authNames The authentications to apply
+   * @param returnType Return type
+   * @return The response body in type of string
+   * @throws ApiException API exception
+   */
+   public <T> T invokeAPI(String path, String method, List<Pair> queryParams, Object body, Map<String, String> headerParams, Map<String, Object> formParams, String accept, String contentType, String[] authNames, GenericType<T> returnType) throws ApiException {
+
+    ClientResponse response = getAPIResponse(path, method, queryParams, body, headerParams, formParams, accept, contentType, authNames);
+
+    statusCode = response.getStatusInfo().getStatusCode();
+    responseHeaders = response.getHeaders();
+
+    if(response.getStatusInfo().getStatusCode() == ClientResponse.Status.NO_CONTENT.getStatusCode()) {
+      return null;
+    } else if (response.getStatusInfo().getFamily() == Family.SUCCESSFUL) {
+      if (returnType == null)
+        return null;
+      else
+        return response.getEntity(returnType);
+    } else {
+      String message = "error";
+      String respBody = null;
+      if (response.hasEntity()) {
+        try {
+          respBody = response.getEntity(String.class);
+          message = respBody;
+        } catch (RuntimeException e) {
+          // e.printStackTrace();
+        }
+      }
+      throw new ApiException(
+        response.getStatusInfo().getStatusCode(),
+        message,
+        response.getHeaders(),
+        respBody);
+    }
+  }
+
+  /**
+   * Update query and header parameters based on authentication settings.
+   *
+   * @param authNames The authentications to apply
+   * @param queryParams Query parameters
+   * @param headerParams Header parameters
+   */
+  private void updateParamsForAuth(String[] authNames, List<Pair> queryParams, Map<String, String> headerParams) {
+    for (String authName : authNames) {
+      Authentication auth = authentications.get(authName);
+      if (auth == null) throw new RuntimeException("Authentication undefined: " + authName);
+      auth.applyToParams(queryParams, headerParams);
+    }
+  }
+
+  /**
+   * Encode the given form parameters as request body.
+   * @param formParams Form parameters
+   * @return HTTP form encoded parameters
+   */
+  private String getXWWWFormUrlencodedParams(Map<String, Object> formParams) {
+    StringBuilder formParamBuilder = new StringBuilder();
+
+    for (Entry<String, Object> param : formParams.entrySet()) {
+      String valueStr = parameterToString(param.getValue());
+      try {
+        formParamBuilder.append(URLEncoder.encode(param.getKey(), "utf8"))
+            .append("=")
+            .append(URLEncoder.encode(valueStr, "utf8"));
+        formParamBuilder.append("&");
+      } catch (UnsupportedEncodingException e) {
+        // move on to next
+      }
+    }
+
+    String encodedFormParams = formParamBuilder.toString();
+    if (encodedFormParams.endsWith("&")) {
+      encodedFormParams = encodedFormParams.substring(0, encodedFormParams.length() - 1);
+    }
+
+    return encodedFormParams;
+  }
+}
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/ApiClient.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/ApiClient.mustache
new file mode 100644
index 00000000000..07e857e75df
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/ApiClient.mustache
@@ -0,0 +1,770 @@
+//overloaded template file within library folder to add this comment
+
+package {{invokerPackage}};
+
+import javax.ws.rs.client.Client;
+import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.Entity;
+import javax.ws.rs.client.Invocation;
+import javax.ws.rs.client.WebTarget;
+import javax.ws.rs.core.Form;
+import javax.ws.rs.core.GenericType;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.Response.Status;
+
+import org.glassfish.jersey.client.ClientConfig;
+import org.glassfish.jersey.client.ClientProperties;
+import org.glassfish.jersey.filter.LoggingFilter;
+import org.glassfish.jersey.jackson.JacksonFeature;
+import org.glassfish.jersey.media.multipart.FormDataBodyPart;
+import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
+import org.glassfish.jersey.media.multipart.MultiPart;
+import org.glassfish.jersey.media.multipart.MultiPartFeature;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+{{^supportJava6}}
+import java.nio.file.Files;
+{{/supportJava6}}
+{{#supportJava6}}
+import org.apache.commons.io.FileUtils;
+{{/supportJava6}}
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.HashMap;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.TimeZone;
+
+import java.net.URLEncoder;
+
+import java.io.File;
+import java.io.UnsupportedEncodingException;
+
+import java.text.DateFormat;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import {{invokerPackage}}.auth.Authentication;
+import {{invokerPackage}}.auth.HttpBasicAuth;
+import {{invokerPackage}}.auth.ApiKeyAuth;
+import {{invokerPackage}}.auth.OAuth;
+
+{{>generatedAnnotation}}
+public class ApiClient {
+  private Map<String, String> defaultHeaderMap = new HashMap<String, String>();
+  private String basePath = "{{{basePath}}}";
+  private boolean debugging = false;
+  private int connectionTimeout = 0;
+
+  private Client httpClient;
+  private JSON json;
+  private String tempFolderPath = null;
+
+  private Map<String, Authentication> authentications;
+
+  private int statusCode;
+  private Map<String, List<String>> responseHeaders;
+
+  private DateFormat dateFormat;
+
+  public ApiClient() {
+    json = new JSON();
+    httpClient = buildHttpClient(debugging);
+
+    this.dateFormat = new RFC3339DateFormat();
+
+    // Set default User-Agent.
+    setUserAgent("{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}Swagger-Codegen/{{{artifactVersion}}}/java{{/httpUserAgent}}");
+
+    // Setup authentications (key: authentication name, value: authentication).
+    authentications = new HashMap<String, Authentication>();{{#authMethods}}{{#isBasic}}
+    authentications.put("{{name}}", new HttpBasicAuth());{{/isBasic}}{{#isApiKey}}
+    authentications.put("{{name}}", new ApiKeyAuth({{#isKeyInHeader}}"header"{{/isKeyInHeader}}{{^isKeyInHeader}}"query"{{/isKeyInHeader}}, "{{keyParamName}}"));{{/isApiKey}}{{#isOAuth}}
+    authentications.put("{{name}}", new OAuth());{{/isOAuth}}{{/authMethods}}
+    // Prevent the authentications from being modified.
+    authentications = Collections.unmodifiableMap(authentications);
+  }
+
+  /**
+   * Gets the JSON instance to do JSON serialization and deserialization.
+   * @return JSON
+   */
+  public JSON getJSON() {
+    return json;
+  }
+
+  public Client getHttpClient() {
+    return httpClient;
+  }
+
+  public ApiClient setHttpClient(Client httpClient) {
+    this.httpClient = httpClient;
+    return this;
+  }
+
+  public String getBasePath() {
+    return basePath;
+  }
+
+  public ApiClient setBasePath(String basePath) {
+    this.basePath = basePath;
+    return this;
+  }
+
+  /**
+   * Gets the status code of the previous request
+   * @return Status code
+   */
+  public int getStatusCode() {
+    return statusCode;
+  }
+
+  /**
+   * Gets the response headers of the previous request
+   * @return Response headers
+   */
+  public Map<String, List<String>> getResponseHeaders() {
+    return responseHeaders;
+  }
+
+  /**
+   * Get authentications (key: authentication name, value: authentication).
+   * @return Map of authentication object
+   */
+  public Map<String, Authentication> getAuthentications() {
+    return authentications;
+  }
+
+  /**
+   * Get authentication for the given name.
+   *
+   * @param authName The authentication name
+   * @return The authentication, null if not found
+   */
+  public Authentication getAuthentication(String authName) {
+    return authentications.get(authName);
+  }
+
+  /**
+   * Helper method to set username for the first HTTP basic authentication.
+   * @param username Username
+   */
+  public void setUsername(String username) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBasicAuth) {
+        ((HttpBasicAuth) auth).setUsername(username);
+        return;
+      }
+    }
+    throw new RuntimeException("No HTTP basic authentication configured!");
+  }
+
+  /**
+   * Helper method to set password for the first HTTP basic authentication.
+   * @param password Password
+   */
+  public void setPassword(String password) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof HttpBasicAuth) {
+        ((HttpBasicAuth) auth).setPassword(password);
+        return;
+      }
+    }
+    throw new RuntimeException("No HTTP basic authentication configured!");
+  }
+
+  /**
+   * Helper method to set API key value for the first API key authentication.
+   * @param apiKey API key
+   */
+  public void setApiKey(String apiKey) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof ApiKeyAuth) {
+        ((ApiKeyAuth) auth).setApiKey(apiKey);
+        return;
+      }
+    }
+    throw new RuntimeException("No API key authentication configured!");
+  }
+
+  /**
+   * Helper method to set API key prefix for the first API key authentication.
+   * @param apiKeyPrefix API key prefix
+   */
+  public void setApiKeyPrefix(String apiKeyPrefix) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof ApiKeyAuth) {
+        ((ApiKeyAuth) auth).setApiKeyPrefix(apiKeyPrefix);
+        return;
+      }
+    }
+    throw new RuntimeException("No API key authentication configured!");
+  }
+
+  /**
+   * Helper method to set access token for the first OAuth2 authentication.
+   * @param accessToken Access token
+   */
+  public void setAccessToken(String accessToken) {
+    for (Authentication auth : authentications.values()) {
+      if (auth instanceof OAuth) {
+        ((OAuth) auth).setAccessToken(accessToken);
+        return;
+      }
+    }
+    throw new RuntimeException("No OAuth2 authentication configured!");
+  }
+
+  /**
+   * Set the User-Agent header's value (by adding to the default header map).
+   * @param userAgent Http user agent
+   * @return API client
+   */
+  public ApiClient setUserAgent(String userAgent) {
+    addDefaultHeader("User-Agent", userAgent);
+    return this;
+  }
+
+  /**
+   * Add a default header.
+   *
+   * @param key The header's key
+   * @param value The header's value
+   * @return API client
+   */
+  public ApiClient addDefaultHeader(String key, String value) {
+    defaultHeaderMap.put(key, value);
+    return this;
+  }
+
+  /**
+   * Check that whether debugging is enabled for this API client.
+   * @return True if debugging is switched on
+   */
+  public boolean isDebugging() {
+    return debugging;
+  }
+
+  /**
+   * Enable/disable debugging for this API client.
+   *
+   * @param debugging To enable (true) or disable (false) debugging
+   * @return API client
+   */
+  public ApiClient setDebugging(boolean debugging) {
+    this.debugging = debugging;
+    // Rebuild HTTP Client according to the new "debugging" value.
+    this.httpClient = buildHttpClient(debugging);
+    return this;
+  }
+
+  /**
+   * The path of temporary folder used to store downloaded files from endpoints
+   * with file response. The default value is <code>null</code>, i.e. using
+   * the system's default tempopary folder.
+   *
+   * @return Temp folder path
+   */
+  public String getTempFolderPath() {
+    return tempFolderPath;
+  }
+
+  /**
+   * Set temp folder path
+   * @param tempFolderPath Temp folder path
+   * @return API client
+   */
+  public ApiClient setTempFolderPath(String tempFolderPath) {
+    this.tempFolderPath = tempFolderPath;
+    return this;
+  }
+
+  /**
+   * Connect timeout (in milliseconds).
+   * @return Connection timeout
+   */
+  public int getConnectTimeout() {
+    return connectionTimeout;
+  }
+
+  /**
+   * Set the connect timeout (in milliseconds).
+   * A value of 0 means no timeout, otherwise values must be between 1 and
+   * {@link Integer#MAX_VALUE}.
+   * @param connectionTimeout Connection timeout in milliseconds
+   * @return API client
+   */
+  public ApiClient setConnectTimeout(int connectionTimeout) {
+    this.connectionTimeout = connectionTimeout;
+    httpClient.property(ClientProperties.CONNECT_TIMEOUT, connectionTimeout);
+    return this;
+  }
+
+  /**
+   * Get the date format used to parse/format date parameters.
+   * @return Date format
+   */
+  public DateFormat getDateFormat() {
+    return dateFormat;
+  }
+
+  /**
+   * Set the date format used to parse/format date parameters.
+   * @param dateFormat Date format
+   * @return API client
+   */
+  public ApiClient setDateFormat(DateFormat dateFormat) {
+    this.dateFormat = dateFormat;
+    // also set the date format for model (de)serialization with Date properties
+    this.json.setDateFormat((DateFormat) dateFormat.clone());
+    return this;
+  }
+
+  /**
+   * Parse the given string into Date object.
+   * @param str String
+   * @return Date
+   */
+  public Date parseDate(String str) {
+    try {
+      return dateFormat.parse(str);
+    } catch (java.text.ParseException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  /**
+   * Format the given Date object into string.
+   * @param date Date
+   * @return Date in string format
+   */
+  public String formatDate(Date date) {
+    return dateFormat.format(date);
+  }
+
+  /**
+   * Format the given parameter object into string.
+   * @param param Object
+   * @return Object in string format
+   */
+  public String parameterToString(Object param) {
+    if (param == null) {
+      return "";
+    } else if (param instanceof Date) {
+      return formatDate((Date) param);
+    } else if (param instanceof Collection) {
+      StringBuilder b = new StringBuilder();
+      for(Object o : (Collection)param) {
+        if(b.length() > 0) {
+          b.append(',');
+        }
+        b.append(String.valueOf(o));
+      }
+      return b.toString();
+    } else {
+      return String.valueOf(param);
+    }
+  }
+
+  /*
+   * Format to {@code Pair} objects.
+   * @param collectionFormat Collection format
+   * @param name Name
+   * @param value Value
+   * @return List of pairs
+   */
+  public List<Pair> parameterToPairs(String collectionFormat, String name, Object value){
+    List<Pair> params = new ArrayList<Pair>();
+
+    // preconditions
+    if (name == null || name.isEmpty() || value == null) return params;
+
+    Collection valueCollection;
+    if (value instanceof Collection) {
+      valueCollection = (Collection) value;
+    } else {
+      params.add(new Pair(name, parameterToString(value)));
+      return params;
+    }
+
+    if (valueCollection.isEmpty()){
+      return params;
+    }
+
+    // get the collection format (default: csv)
+    String format = (collectionFormat == null || collectionFormat.isEmpty() ? "csv" : collectionFormat);
+
+    // create the params based on the collection format
+    if ("multi".equals(format)) {
+      for (Object item : valueCollection) {
+        params.add(new Pair(name, parameterToString(item)));
+      }
+
+      return params;
+    }
+
+    String delimiter = ",";
+
+    if ("csv".equals(format)) {
+      delimiter = ",";
+    } else if ("ssv".equals(format)) {
+      delimiter = " ";
+    } else if ("tsv".equals(format)) {
+      delimiter = "\t";
+    } else if ("pipes".equals(format)) {
+      delimiter = "|";
+    }
+
+    StringBuilder sb = new StringBuilder() ;
+    for (Object item : valueCollection) {
+      sb.append(delimiter);
+      sb.append(parameterToString(item));
+    }
+
+    params.add(new Pair(name, sb.substring(1)));
+
+    return params;
+  }
+
+  /**
+   * Check if the given MIME is a JSON MIME.
+   * JSON MIME examples:
+   *   application/json
+   *   application/json; charset=UTF8
+   *   APPLICATION/JSON
+   * @param mime MIME
+   * @return True if the MIME type is JSON
+   */
+  public boolean isJsonMime(String mime) {
+    return mime != null && mime.matches("(?i)application\\/json(;.*)?");
+  }
+
+  /**
+   * Select the Accept header's value from the given accepts array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use all of them (joining into a string)
+   *
+   * @param accepts The accepts array to select from
+   * @return The Accept header to use. If the given array is empty,
+   *   null will be returned (not to set the Accept header explicitly).
+   */
+  public String selectHeaderAccept(String[] accepts) {
+    if (accepts.length == 0) {
+      return null;
+    }
+    for (String accept : accepts) {
+      if (isJsonMime(accept)) {
+        return accept;
+      }
+    }
+    return StringUtil.join(accepts, ",");
+  }
+
+  /**
+   * Select the Content-Type header's value from the given array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use the first one of the array.
+   *
+   * @param contentTypes The Content-Type array to select from
+   * @return The Content-Type header to use. If the given array is empty,
+   *   JSON will be used.
+   */
+  public String selectHeaderContentType(String[] contentTypes) {
+    if (contentTypes.length == 0) {
+      return "application/json";
+    }
+    for (String contentType : contentTypes) {
+      if (isJsonMime(contentType)) {
+        return contentType;
+      }
+    }
+    return contentTypes[0];
+  }
+
+  /**
+   * Escape the given string to be used as URL query value.
+   * @param str String
+   * @return Escaped string
+   */
+  public String escapeString(String str) {
+    try {
+      return URLEncoder.encode(str, "utf8").replaceAll("\\+", "%20");
+    } catch (UnsupportedEncodingException e) {
+      return str;
+    }
+  }
+
+  /**
+   * Serialize the given Java object into string entity according the given
+   * Content-Type (only JSON is supported for now).
+   * @param obj Object
+   * @param formParams Form parameters
+   * @param contentType Context type
+   * @return Entity
+   * @throws ApiException API exception
+   */
+  public Entity<?> serialize(Object obj, Map<String, Object> formParams, String contentType) throws ApiException {
+    Entity<?> entity;
+    if (contentType.startsWith("multipart/form-data")) {
+      MultiPart multiPart = new MultiPart();
+      for (Entry<String, Object> param: formParams.entrySet()) {
+        if (param.getValue() instanceof File) {
+          File file = (File) param.getValue();
+          FormDataContentDisposition contentDisp = FormDataContentDisposition.name(param.getKey())
+              .fileName(file.getName()).size(file.length()).build();
+          multiPart.bodyPart(new FormDataBodyPart(contentDisp, file, MediaType.APPLICATION_OCTET_STREAM_TYPE));
+        } else {
+          FormDataContentDisposition contentDisp = FormDataContentDisposition.name(param.getKey()).build();
+          multiPart.bodyPart(new FormDataBodyPart(contentDisp, parameterToString(param.getValue())));
+        }
+      }
+      entity = Entity.entity(multiPart, MediaType.MULTIPART_FORM_DATA_TYPE);
+    } else if (contentType.startsWith("application/x-www-form-urlencoded")) {
+      Form form = new Form();
+      for (Entry<String, Object> param: formParams.entrySet()) {
+        form.param(param.getKey(), parameterToString(param.getValue()));
+      }
+      entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE);
+    } else {
+      // We let jersey handle the serialization
+      entity = Entity.entity(obj, contentType);
+    }
+    return entity;
+  }
+
+  /**
+   * Deserialize response body to Java object according to the Content-Type.
+   * @param <T> Type
+   * @param response Response
+   * @param returnType Return type
+   * @return Deserialize object
+   * @throws ApiException API exception
+   */
+  @SuppressWarnings("unchecked")
+  public <T> T deserialize(Response response, GenericType<T> returnType) throws ApiException {
+    if (response == null || returnType == null) {
+      return null;
+    }
+
+    if ("byte[]".equals(returnType.toString())) {
+      // Handle binary response (byte array).
+      return (T) response.readEntity(byte[].class);
+    } else if (returnType.getRawType() == File.class) {
+      // Handle file downloading.
+      T file = (T) downloadFileFromResponse(response);
+      return file;
+    }
+
+    String contentType = null;
+    List<Object> contentTypes = response.getHeaders().get("Content-Type");
+    if (contentTypes != null && !contentTypes.isEmpty())
+      contentType = String.valueOf(contentTypes.get(0));
+    if (contentType == null)
+      throw new ApiException(500, "missing Content-Type in response");
+
+    return response.readEntity(returnType);
+  }
+
+  /**
+   * Download file from the given response.
+   * @param response Response
+   * @return File
+   * @throws ApiException If fail to read file content from response and write to disk
+   */
+  public File downloadFileFromResponse(Response response) throws ApiException {
+    try {
+      File file = prepareDownloadFile(response);
+{{^supportJava6}}
+      Files.copy(response.readEntity(InputStream.class), file.toPath());
+{{/supportJava6}}
+{{#supportJava6}}
+      // Java6 falls back to commons.io for file copying
+      FileUtils.copyToFile(response.readEntity(InputStream.class), file);
+{{/supportJava6}}
+      return file;
+    } catch (IOException e) {
+      throw new ApiException(e);
+    }
+  }
+
+  public File prepareDownloadFile(Response response) throws IOException {
+    String filename = null;
+    String contentDisposition = (String) response.getHeaders().getFirst("Content-Disposition");
+    if (contentDisposition != null && !"".equals(contentDisposition)) {
+      // Get filename from the Content-Disposition header.
+      Pattern pattern = Pattern.compile("filename=['\"]?([^'\"\\s]+)['\"]?");
+      Matcher matcher = pattern.matcher(contentDisposition);
+      if (matcher.find())
+        filename = matcher.group(1);
+    }
+
+    String prefix;
+    String suffix = null;
+    if (filename == null) {
+      prefix = "download-";
+      suffix = "";
+    } else {
+      int pos = filename.lastIndexOf('.');
+      if (pos == -1) {
+        prefix = filename + "-";
+      } else {
+        prefix = filename.substring(0, pos) + "-";
+        suffix = filename.substring(pos);
+      }
+      // File.createTempFile requires the prefix to be at least three characters long
+      if (prefix.length() < 3)
+        prefix = "download-";
+    }
+
+    if (tempFolderPath == null)
+      return File.createTempFile(prefix, suffix);
+    else
+      return File.createTempFile(prefix, suffix, new File(tempFolderPath));
+  }
+
+  /**
+   * Invoke API by sending HTTP request with the given options.
+   *
+   * @param <T> Type
+   * @param path The sub-path of the HTTP URL
+   * @param method The request method, one of "GET", "POST", "PUT", and "DELETE"
+   * @param queryParams The query parameters
+   * @param body The request body object
+   * @param headerParams The header parameters
+   * @param formParams The form parameters
+   * @param accept The request's Accept header
+   * @param contentType The request's Content-Type header
+   * @param authNames The authentications to apply
+   * @param returnType The return type into which to deserialize the response
+   * @return The response body in type of string
+   * @throws ApiException API exception
+   */
+  public <T> T invokeAPI(String path, String method, List<Pair> queryParams, Object body, Map<String, String> headerParams, Map<String, Object> formParams, String accept, String contentType, String[] authNames, GenericType<T> returnType) throws ApiException {
+    updateParamsForAuth(authNames, queryParams, headerParams);
+
+    // Not using `.target(this.basePath).path(path)` below,
+    // to support (constant) query string in `path`, e.g. "/posts?draft=1"
+    WebTarget target = httpClient.target(this.basePath + path);
+
+    if (queryParams != null) {
+      for (Pair queryParam : queryParams) {
+        if (queryParam.getValue() != null) {
+          target = target.queryParam(queryParam.getName(), queryParam.getValue());
+        }
+      }
+    }
+
+    Invocation.Builder invocationBuilder = target.request().accept(accept);
+
+    for (Entry<String, String> entry : headerParams.entrySet()) {
+      String value = entry.getValue();
+      if (value != null) {
+        invocationBuilder = invocationBuilder.header(entry.getKey(), value);
+      }
+    }
+
+    for (Entry<String, String> entry : defaultHeaderMap.entrySet()) {
+      String key = entry.getKey();
+      if (!headerParams.containsKey(key)) {
+        String value = entry.getValue();
+        if (value != null) {
+          invocationBuilder = invocationBuilder.header(key, value);
+        }
+      }
+    }
+
+    Entity<?> entity = serialize(body, formParams, contentType);
+
+    Response response;
+
+    if ("GET".equals(method)) {
+      response = invocationBuilder.get();
+    } else if ("POST".equals(method)) {
+      response = invocationBuilder.post(entity);
+    } else if ("PUT".equals(method)) {
+      response = invocationBuilder.put(entity);
+    } else if ("DELETE".equals(method)) {
+      response = invocationBuilder.delete();
+    } else if ("PATCH".equals(method)) {
+      response = invocationBuilder.header("X-HTTP-Method-Override", "PATCH").post(entity);
+    } else {
+      throw new ApiException(500, "unknown method type " + method);
+    }
+
+    statusCode = response.getStatusInfo().getStatusCode();
+    responseHeaders = buildResponseHeaders(response);
+
+    if (response.getStatus() == Status.NO_CONTENT.getStatusCode()) {
+      return null;
+    } else if (response.getStatusInfo().getFamily() == Status.Family.SUCCESSFUL) {
+      if (returnType == null)
+        return null;
+      else
+        return deserialize(response, returnType);
+    } else {
+      String message = "error";
+      String respBody = null;
+      if (response.hasEntity()) {
+        try {
+          respBody = String.valueOf(response.readEntity(String.class));
+          message = respBody;
+        } catch (RuntimeException e) {
+          // e.printStackTrace();
+        }
+      }
+      throw new ApiException(
+        response.getStatus(),
+        message,
+        buildResponseHeaders(response),
+        respBody);
+    }
+  }
+
+  /**
+   * Build the Client used to make HTTP requests.
+   * @param debugging Debug setting
+   * @return Client
+   */
+  private Client buildHttpClient(boolean debugging) {
+    final ClientConfig clientConfig = new ClientConfig();
+    clientConfig.register(MultiPartFeature.class);
+    clientConfig.register(json);
+    clientConfig.register(JacksonFeature.class);
+    if (debugging) {
+      clientConfig.register(LoggingFilter.class);
+    }
+    return ClientBuilder.newClient(clientConfig);
+  }
+
+  private Map<String, List<String>> buildResponseHeaders(Response response) {
+    Map<String, List<String>> responseHeaders = new HashMap<String, List<String>>();
+    for (Entry<String, List<Object>> entry: response.getHeaders().entrySet()) {
+      List<Object> values = entry.getValue();
+      List<String> headers = new ArrayList<String>();
+      for (Object o : values) {
+        headers.add(String.valueOf(o));
+      }
+      responseHeaders.put(entry.getKey(), headers);
+    }
+    return responseHeaders;
+  }
+
+  /**
+   * Update query and header parameters based on authentication settings.
+   *
+   * @param authNames The authentications to apply
+   */
+  private void updateParamsForAuth(String[] authNames, List<Pair> queryParams, Map<String, String> headerParams) {
+    for (String authName : authNames) {
+      Authentication auth = authentications.get(authName);
+      if (auth == null) throw new RuntimeException("Authentication undefined: " + authName);
+      auth.applyToParams(queryParams, headerParams);
+    }
+  }
+}
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/JSON.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/JSON.mustache
new file mode 100644
index 00000000000..52e94ec9326
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/JSON.mustache
@@ -0,0 +1,50 @@
+//overloaded template file within library folder to add this comment
+
+package {{invokerPackage}};
+
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.databind.*;
+{{#java8}}
+import com.fasterxml.jackson.datatype.jsr310.*;
+{{/java8}}
+{{^java8}}
+import com.fasterxml.jackson.datatype.joda.*;
+{{/java8}}
+
+import java.text.DateFormat;
+
+import javax.ws.rs.ext.ContextResolver;
+
+{{>generatedAnnotation}}
+public class JSON implements ContextResolver<ObjectMapper> {
+  private ObjectMapper mapper;
+
+  public JSON() {
+    mapper = new ObjectMapper();
+    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+    mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
+    mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
+    mapper.setDateFormat(new RFC3339DateFormat());
+    {{#java8}}
+    mapper.registerModule(new JavaTimeModule());
+    {{/java8}}
+    {{^java8}}
+    mapper.registerModule(new JodaModule());
+    {{/java8}}
+  }
+
+  /**
+   * Set the date format for JSON (de)serialization with Date properties.
+   * @param dateFormat Date format
+   */
+  public void setDateFormat(DateFormat dateFormat) {
+    mapper.setDateFormat(dateFormat);
+  }
+
+  @Override
+  public ObjectMapper getContext(Class<?> type) {
+    return mapper;
+  }
+}
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/api.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/api.mustache
new file mode 100644
index 00000000000..85cd2b5f714
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/api.mustache
@@ -0,0 +1,105 @@
+//overloaded template file within library folder to add this comment
+
+package {{package}};
+
+import {{invokerPackage}}.ApiException;
+import {{invokerPackage}}.ApiClient;
+import {{invokerPackage}}.Configuration;
+import {{invokerPackage}}.Pair;
+
+import javax.ws.rs.core.GenericType;
+
+{{#imports}}import {{import}};
+{{/imports}}
+
+{{^fullJavaUtil}}
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+{{/fullJavaUtil}}
+
+{{>generatedAnnotation}}
+{{#operations}}
+public class {{classname}} {
+  private ApiClient {{localVariablePrefix}}apiClient;
+
+  public {{classname}}() {
+    this(Configuration.getDefaultApiClient());
+  }
+
+  public {{classname}}(ApiClient apiClient) {
+    this.{{localVariablePrefix}}apiClient = apiClient;
+  }
+
+  public ApiClient getApiClient() {
+    return {{localVariablePrefix}}apiClient;
+  }
+
+  public void setApiClient(ApiClient apiClient) {
+    this.{{localVariablePrefix}}apiClient = apiClient;
+  }
+
+  {{#operation}}
+  /**
+   * {{summary}}
+   * {{notes}}
+   {{#allParams}}
+   * @param {{paramName}} {{description}}{{#required}} (required){{/required}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
+   {{/allParams}}
+   {{#returnType}}
+   * @return {{returnType}}
+   {{/returnType}}
+   * @throws ApiException if fails to make API call
+   */
+  public {{#returnType}}{{{returnType}}} {{/returnType}}{{^returnType}}void {{/returnType}}{{operationId}}({{#allParams}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}) throws ApiException {
+    Object {{localVariablePrefix}}localVarPostBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}null{{/bodyParam}};
+    {{#allParams}}{{#required}}
+    // verify the required parameter '{{paramName}}' is set
+    if ({{paramName}} == null) {
+      throw new ApiException(400, "Missing the required parameter '{{paramName}}' when calling {{operationId}}");
+    }
+    {{/required}}{{/allParams}}
+    // create path and map variables
+    String {{localVariablePrefix}}localVarPath = "{{{path}}}".replaceAll("\\{format\\}","json"){{#pathParams}}
+      .replaceAll("\\{" + "{{baseName}}" + "\\}", {{localVariablePrefix}}apiClient.escapeString({{{paramName}}}.toString())){{/pathParams}};
+
+    // query params
+    {{javaUtilPrefix}}List<Pair> {{localVariablePrefix}}localVarQueryParams = new {{javaUtilPrefix}}ArrayList<Pair>();
+    {{javaUtilPrefix}}Map<String, String> {{localVariablePrefix}}localVarHeaderParams = new {{javaUtilPrefix}}HashMap<String, String>();
+    {{javaUtilPrefix}}Map<String, Object> {{localVariablePrefix}}localVarFormParams = new {{javaUtilPrefix}}HashMap<String, Object>();
+
+    {{#queryParams}}
+    {{localVariablePrefix}}localVarQueryParams.addAll({{localVariablePrefix}}apiClient.parameterToPairs("{{#collectionFormat}}{{{collectionFormat}}}{{/collectionFormat}}", "{{baseName}}", {{paramName}}));
+    {{/queryParams}}
+
+    {{#headerParams}}if ({{paramName}} != null)
+      {{localVariablePrefix}}localVarHeaderParams.put("{{baseName}}", {{localVariablePrefix}}apiClient.parameterToString({{paramName}}));
+    {{/headerParams}}
+
+    {{#formParams}}if ({{paramName}} != null)
+      {{localVariablePrefix}}localVarFormParams.put("{{baseName}}", {{paramName}});
+    {{/formParams}}
+
+    final String[] {{localVariablePrefix}}localVarAccepts = {
+      {{#produces}}"{{{mediaType}}}"{{#hasMore}}, {{/hasMore}}{{/produces}}
+    };
+    final String {{localVariablePrefix}}localVarAccept = {{localVariablePrefix}}apiClient.selectHeaderAccept({{localVariablePrefix}}localVarAccepts);
+
+    final String[] {{localVariablePrefix}}localVarContentTypes = {
+      {{#consumes}}"{{{mediaType}}}"{{#hasMore}}, {{/hasMore}}{{/consumes}}
+    };
+    final String {{localVariablePrefix}}localVarContentType = {{localVariablePrefix}}apiClient.selectHeaderContentType({{localVariablePrefix}}localVarContentTypes);
+
+    String[] {{localVariablePrefix}}localVarAuthNames = new String[] { {{#authMethods}}"{{name}}"{{#hasMore}}, {{/hasMore}}{{/authMethods}} };
+
+    {{#returnType}}
+    GenericType<{{{returnType}}}> {{localVariablePrefix}}localVarReturnType = new GenericType<{{{returnType}}}>() {};
+    return {{localVariablePrefix}}apiClient.invokeAPI({{localVariablePrefix}}localVarPath, "{{httpMethod}}", {{localVariablePrefix}}localVarQueryParams, {{localVariablePrefix}}localVarPostBody, {{localVariablePrefix}}localVarHeaderParams, {{localVariablePrefix}}localVarFormParams, {{localVariablePrefix}}localVarAccept, {{localVariablePrefix}}localVarContentType, {{localVariablePrefix}}localVarAuthNames, {{localVariablePrefix}}localVarReturnType);
+    {{/returnType}}{{^returnType}}
+    {{localVariablePrefix}}apiClient.invokeAPI({{localVariablePrefix}}localVarPath, "{{httpMethod}}", {{localVariablePrefix}}localVarQueryParams, {{localVariablePrefix}}localVarPostBody, {{localVariablePrefix}}localVarHeaderParams, {{localVariablePrefix}}localVarFormParams, {{localVariablePrefix}}localVarAccept, {{localVariablePrefix}}localVarContentType, {{localVariablePrefix}}localVarAuthNames, null);
+    {{/returnType}}
+  }
+  {{/operation}}
+}
+{{/operations}}
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.gradle.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.gradle.mustache
new file mode 100644
index 00000000000..739287b28c4
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.gradle.mustache
@@ -0,0 +1,144 @@
+//overloaded template file within library folder to add this comment
+
+apply plugin: 'idea'
+apply plugin: 'eclipse'
+
+group = '{{groupId}}'
+version = '{{artifactVersion}}'
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:1.5.+'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
+    }
+}
+
+repositories {
+    jcenter()
+}
+
+
+if(hasProperty('target') && target == 'android') {
+
+    apply plugin: 'com.android.library'
+    apply plugin: 'com.github.dcendents.android-maven'
+
+    android {
+        compileSdkVersion 23
+        buildToolsVersion '23.0.2'
+        defaultConfig {
+            minSdkVersion 14
+            targetSdkVersion 23
+        }
+        compileOptions {
+            {{#java8}}
+            sourceCompatibility JavaVersion.VERSION_1_8
+            targetCompatibility JavaVersion.VERSION_1_8
+            {{/java8}}
+            {{^java8}}
+            sourceCompatibility JavaVersion.VERSION_1_7
+            targetCompatibility JavaVersion.VERSION_1_7
+            {{/java8}}
+        }
+
+        // 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}-${version}.jar"
+            artifacts.add('archives', task);
+        }
+    }
+
+    task sourcesJar(type: Jar) {
+        from android.sourceSets.main.java.srcDirs
+        classifier = 'sources'
+    }
+
+    artifacts {
+        archives sourcesJar
+    }
+
+} else {
+
+    apply plugin: 'java'
+    apply plugin: 'maven'
+    {{#java8}}
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+    {{/java8}}
+    {{^java8}}
+    sourceCompatibility = JavaVersion.VERSION_1_7
+    targetCompatibility = JavaVersion.VERSION_1_7
+    {{/java8}}
+
+    install {
+        repositories.mavenInstaller {
+            pom.artifactId = '{{artifactId}}'
+        }
+    }
+
+    task execute(type:JavaExec) {
+       main = System.getProperty('mainClass')
+       classpath = sourceSets.main.runtimeClasspath
+    }
+}
+
+ext {
+    swagger_annotations_version = "1.5.8"
+    jackson_version = "2.7.5"
+    jersey_version = "2.22.2"
+    {{^java8}}
+    jodatime_version = "2.9.4"
+    {{/java8}}
+    {{#supportJava6}}
+    commons_io_version=2.5
+    commons_lang3_version=3.5
+    {{/supportJava6}}
+    junit_version = "4.12"
+}
+
+dependencies {
+    compile "io.swagger:swagger-annotations:$swagger_annotations_version"
+    compile "org.glassfish.jersey.core:jersey-client:$jersey_version"
+    compile "org.glassfish.jersey.media:jersey-media-multipart:$jersey_version"
+    compile "org.glassfish.jersey.media:jersey-media-json-jackson:$jersey_version"
+    compile "com.fasterxml.jackson.core:jackson-core:$jackson_version"
+    compile "com.fasterxml.jackson.core:jackson-annotations:$jackson_version"
+    compile "com.fasterxml.jackson.core:jackson-databind:$jackson_version"
+    {{#java8}}
+    compile "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:$jackson_version"
+    {{/java8}}
+    {{^java8}}
+    compile "com.fasterxml.jackson.datatype:jackson-datatype-joda:$jackson_version"
+    compile "joda-time:joda-time:$jodatime_version"
+    {{/java8}}
+    {{#supportJava6}}
+    compile "commons-io:commons-io:$commons_io_version"
+    compile "org.apache.commons:commons-lang3:$commons_lang3_version"
+    {{/supportJava6}}
+    compile "com.brsanthu:migbase64:2.2"
+    testCompile "junit:junit:$junit_version"
+}
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.sbt.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.sbt.mustache
new file mode 100644
index 00000000000..b2d31d23f7e
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/build.sbt.mustache
@@ -0,0 +1,36 @@
+//overloaded template file within library folder to add this comment
+
+lazy val root = (project in file(".")).
+  settings(
+    organization := "{{groupId}}",
+    name := "{{artifactId}}",
+    version := "{{artifactVersion}}",
+    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" % "1.5.8",
+      "org.glassfish.jersey.core" % "jersey-client" % "2.22.2",
+      "org.glassfish.jersey.media" % "jersey-media-multipart" % "2.22.2",
+      "org.glassfish.jersey.media" % "jersey-media-json-jackson" % "2.22.2",
+      "com.fasterxml.jackson.core" % "jackson-core" % "2.7.5",
+      "com.fasterxml.jackson.core" % "jackson-annotations" % "2.7.5",
+      "com.fasterxml.jackson.core" % "jackson-databind" % "2.7.5",
+      {{#java8}}
+	  "com.fasterxml.jackson.datatype" % "jackson-datatype-jsr310" % "2.7.5",
+	  {{/java8}}
+	  {{^java8}}
+      "com.fasterxml.jackson.datatype" % "jackson-datatype-joda" % "2.7.5",
+      "joda-time" % "joda-time" % "2.9.4",
+      {{/java8}}
+      "com.brsanthu" % "migbase64" % "2.2",
+      {{#supportJava6}}
+      "org.apache.commons" % "commons-lang3" % "3.5",
+      "commons-io" % "commons-io" % "2.5",
+      {{/supportJava6}}
+      "junit" % "junit" % "4.12" % "test",
+      "com.novocode" % "junit-interface" % "0.10" % "test"
+    )
+  )
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/pom.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/pom.mustache
new file mode 100644
index 00000000000..a865adc3c11
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/libraries/jersey2/pom.mustache
@@ -0,0 +1,289 @@
+//overloaded template file within library folder to add this comment
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>{{groupId}}</groupId>
+  <artifactId>{{artifactId}}</artifactId>
+  <packaging>jar</packaging>
+  <name>{{artifactId}}</name>
+  <version>{{artifactVersion}}</version>
+  <url>{{artifactUrl}}</url>
+  <description>{{artifactDescription}}</description>
+  <scm>
+    <connection>{{scmConnection}}</connection>
+    <developerConnection>{{scmDeveloperConnection}}</developerConnection>
+    <url>{{scmUrl}}</url>
+  </scm>
+  <prerequisites>
+    <maven>2.2.0</maven>
+  </prerequisites>
+
+  <licenses>
+    <license>
+      <name>{{licenseName}}</name>
+      <url>{{licenseUrl}}</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+
+  <developers>
+    <developer>
+      <name>{{developerName}}</name>
+      <email>{{developerEmail}}</email>
+      <organization>{{developerOrganization}}</organization>
+      <organizationUrl>{{developerOrganizationUrl}}</organizationUrl>
+    </developer>
+  </developers>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>2.12</version>
+        <configuration>
+          <systemProperties>
+            <property>
+              <name>loggerPath</name>
+              <value>conf/log4j.properties</value>
+            </property>
+          </systemProperties>
+          <argLine>-Xms512m -Xmx1500m</argLine>
+          <parallel>methods</parallel>
+          <forkMode>pertest</forkMode>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-dependency-plugin</artifactId>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>copy-dependencies</goal>
+            </goals>
+            <configuration>
+              <outputDirectory>${project.build.directory}/lib</outputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
+      <!-- attach test jar -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.6</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>jar</goal>
+              <goal>test-jar</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>build-helper-maven-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>add_sources</id>
+            <phase>generate-sources</phase>
+            <goals>
+              <goal>add-source</goal>
+            </goals>
+            <configuration>
+              <sources>
+                <source>src/main/java</source>
+              </sources>
+            </configuration>
+          </execution>
+          <execution>
+            <id>add_test_sources</id>
+            <phase>generate-test-sources</phase>
+            <goals>
+              <goal>add-test-source</goal>
+            </goals>
+            <configuration>
+              <sources>
+                <source>src/test/java</source>
+              </sources>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.5.1</version>
+        <configuration>
+          {{#java8}}
+          <source>1.8</source>
+          <target>1.8</target>
+          {{/java8}}
+          {{^java8}}
+          <source>1.7</source>
+          <target>1.7</target>
+          {{/java8}}
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <version>2.10.4</version>
+        <executions>
+          <execution>
+            <id>attach-javadocs</id>
+            <goals>
+              <goal>jar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <version>2.2.1</version>
+        <executions>
+          <execution>
+            <id>attach-sources</id>
+            <goals>
+              <goal>jar-no-fork</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+
+  <profiles>
+    <profile>
+      <id>sign-artifacts</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-gpg-plugin</artifactId>
+            <version>1.5</version>
+            <executions>
+              <execution>
+                <id>sign-artifacts</id>
+                <phase>verify</phase>
+                <goals>
+                  <goal>sign</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
+  <dependencies>
+    <dependency>
+      <groupId>io.swagger</groupId>
+      <artifactId>swagger-annotations</artifactId>
+      <version>${swagger-core-version}</version>
+    </dependency>
+
+    <!-- HTTP client: jersey-client -->
+    <dependency>
+      <groupId>org.glassfish.jersey.core</groupId>
+      <artifactId>jersey-client</artifactId>
+      <version>${jersey-version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.glassfish.jersey.media</groupId>
+      <artifactId>jersey-media-multipart</artifactId>
+      <version>${jersey-version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.glassfish.jersey.media</groupId>
+      <artifactId>jersey-media-json-jackson</artifactId>
+      <version>${jersey-version}</version>
+    </dependency>
+
+    <!-- JSON processing: jackson -->
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+      <version>${jackson-version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-annotations</artifactId>
+      <version>${jackson-version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+      <version>${jackson-version}</version>
+    </dependency>
+    {{#java8}}
+    <dependency>
+      <groupId>com.fasterxml.jackson.datatype</groupId>
+      <artifactId>jackson-datatype-jsr310</artifactId>
+      <version>${jackson-version}</version>
+    </dependency>
+    {{/java8}}
+    {{^java8}}
+    <dependency>
+      <groupId>com.fasterxml.jackson.datatype</groupId>
+      <artifactId>jackson-datatype-joda</artifactId>
+      <version>${jackson-version}</version>
+    </dependency>
+    <dependency>
+      <groupId>joda-time</groupId>
+      <artifactId>joda-time</artifactId>
+      <version>${jodatime-version}</version>
+    </dependency>
+    {{/java8}}
+
+    <!-- Base64 encoding that works in both JVM and Android -->
+    <dependency>
+      <groupId>com.brsanthu</groupId>
+      <artifactId>migbase64</artifactId>
+      <version>2.2</version>
+    </dependency>
+    {{#supportJava6}}
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-lang3</artifactId>
+      <version>${commons_lang3_version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>${commons_io_version}</version>
+    </dependency>
+    {{/supportJava6}}
+
+    <!-- test dependencies -->
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>${junit-version}</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <properties>
+    <swagger-core-version>1.5.9</swagger-core-version>
+    <jersey-version>2.22.2</jersey-version>
+    <jackson-version>2.7.5</jackson-version>
+    {{^java8}}
+    <jodatime-version>2.9.4</jodatime-version>
+    {{/java8}}
+    {{#supportJava6}}
+    <commons_io_version>2.5</commons_io_version>
+    <commons_lang3_version>3.5</commons_lang3_version>
+    {{/supportJava6}}
+    <maven-plugin-version>1.0.0</maven-plugin-version>
+    <junit-version>4.12</junit-version>
+  </properties>
+</project>
diff --git a/modules/swagger-codegen/src/test/resources/2_0/templates/Java/model.mustache b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/model.mustache
new file mode 100644
index 00000000000..07adf19139f
--- /dev/null
+++ b/modules/swagger-codegen/src/test/resources/2_0/templates/Java/model.mustache
@@ -0,0 +1,31 @@
+//overloaded main template file to add this comment
+
+{{>licenseInfo}}
+
+package {{package}};
+
+{{^supportJava6}}
+import java.util.Objects;
+{{/supportJava6}}
+{{#supportJava6}}
+import org.apache.commons.lang3.ObjectUtils;
+{{/supportJava6}}
+{{#imports}}
+import {{import}};
+{{/imports}}
+{{#serializableModel}}
+import java.io.Serializable;
+{{/serializableModel}}
+{{#parcelableModel}}
+import android.os.Parcelable;
+import android.os.Parcel;
+{{/parcelableModel}}
+{{#useBeanValidation}}
+import javax.validation.constraints.*;
+{{/useBeanValidation}}
+
+{{#models}}
+{{#model}}
+{{#isEnum}}{{>modelEnum}}{{/isEnum}}{{^isEnum}}{{>pojo}}{{/isEnum}}
+{{/model}}
+{{/models}}