Refactor default and example values in Java generators (#1045)

* fix default, example for java okhttp

* update java feign samples

* update samples, doc

* add new doc for dart-jaguar

* update model template

* update jaxrs spec model

* update resteasy sample

* update java samples

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -18,7 +18,7 @@ public interface AnotherFakeApi extends ApiClient.Api {
   /**
    * To test special tags
    * To test special tags and operation ID starting with number
-    * @param client client model (required)
+   * @param client client model (required)
    * @return Client
    */
   @RequestLine("PATCH /another-fake/dummy")

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/FakeApi.java

@@ -25,7 +25,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * Test serialization of outer boolean types
-    * @param body Input boolean as post body (optional)
+   * @param body Input boolean as post body (optional)
    * @return Boolean
    */
   @RequestLine("POST /fake/outer/boolean")
@@ -38,7 +38,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * Test serialization of object with outer number type
-    * @param outerComposite Input composite as post body (optional)
+   * @param outerComposite Input composite as post body (optional)
    * @return OuterComposite
    */
   @RequestLine("POST /fake/outer/composite")
@@ -51,7 +51,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * Test serialization of outer number types
-    * @param body Input number as post body (optional)
+   * @param body Input number as post body (optional)
    * @return BigDecimal
    */
   @RequestLine("POST /fake/outer/number")
@@ -64,7 +64,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * Test serialization of outer string types
-    * @param body Input string as post body (optional)
+   * @param body Input string as post body (optional)
    * @return String
    */
   @RequestLine("POST /fake/outer/string")
@@ -77,7 +77,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * For this test, the body for this request much reference a schema named `File`.
-    * @param fileSchemaTestClass  (required)
+   * @param fileSchemaTestClass  (required)
    */
   @RequestLine("PUT /fake/body-with-file-schema")
   @Headers({
@@ -89,8 +89,8 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * 
    * 
-    * @param query  (required)
-    * @param user  (required)
+   * @param query  (required)
+   * @param user  (required)
    */
   @RequestLine("PUT /fake/body-with-query-params?query={query}")
   @Headers({
@@ -135,7 +135,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * To test \"client\" model
    * To test \"client\" model
-    * @param client client model (required)
+   * @param client client model (required)
    * @return Client
    */
   @RequestLine("PATCH /fake")
@@ -148,20 +148,20 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
    * Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
-    * @param number None (required)
-    * @param _double None (required)
-    * @param patternWithoutDelimiter None (required)
-    * @param _byte None (required)
-    * @param integer None (optional, default to null)
-    * @param int32 None (optional, default to null)
-    * @param int64 None (optional, default to null)
-    * @param _float None (optional, default to null)
-    * @param string None (optional, default to null)
-    * @param binary None (optional, default to null)
-    * @param date None (optional, default to null)
-    * @param dateTime None (optional, default to null)
-    * @param password None (optional, default to null)
-    * @param paramCallback None (optional, default to null)
+   * @param number None (required)
+   * @param _double None (required)
+   * @param patternWithoutDelimiter None (required)
+   * @param _byte None (required)
+   * @param integer None (optional)
+   * @param int32 None (optional)
+   * @param int64 None (optional)
+   * @param _float None (optional)
+   * @param string None (optional)
+   * @param binary None (optional)
+   * @param date None (optional)
+   * @param dateTime None (optional)
+   * @param password None (optional)
+   * @param paramCallback None (optional)
    */
   @RequestLine("POST /fake")
   @Headers({
@@ -173,14 +173,14 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * To test enum parameters
    * To test enum parameters
-    * @param enumHeaderStringArray Header parameter enum test (string array) (optional)
-    * @param enumHeaderString Header parameter enum test (string) (optional, default to -efg)
-    * @param enumQueryStringArray Query parameter enum test (string array) (optional)
-    * @param enumQueryString Query parameter enum test (string) (optional, default to -efg)
-    * @param enumQueryInteger Query parameter enum test (double) (optional)
-    * @param enumQueryDouble Query parameter enum test (double) (optional)
-    * @param enumFormStringArray Form parameter enum test (string array) (optional, default to $)
-    * @param enumFormString Form parameter enum test (string) (optional, default to -efg)
+   * @param enumHeaderStringArray Header parameter enum test (string array) (optional)
+   * @param enumHeaderString Header parameter enum test (string) (optional, default to -efg)
+   * @param enumQueryStringArray Query parameter enum test (string array) (optional)
+   * @param enumQueryString Query parameter enum test (string) (optional, default to -efg)
+   * @param enumQueryInteger Query parameter enum test (double) (optional)
+   * @param enumQueryDouble Query parameter enum test (double) (optional)
+   * @param enumFormStringArray Form parameter enum test (string array) (optional)
+   * @param enumFormString Form parameter enum test (string) (optional, default to -efg)
    */
   @RequestLine("GET /fake?enum_query_string_array={enumQueryStringArray}&enum_query_string={enumQueryString}&enum_query_integer={enumQueryInteger}&enum_query_double={enumQueryDouble}")
   @Headers({
@@ -202,7 +202,7 @@ public interface FakeApi extends ApiClient.Api {
    * building up this map in a fluent style.
    * @param enumHeaderStringArray Header parameter enum test (string array) (optional)
    * @param enumHeaderString Header parameter enum test (string) (optional, default to -efg)
-   * @param enumFormStringArray Form parameter enum test (string array) (optional, default to $)
+   * @param enumFormStringArray Form parameter enum test (string array) (optional)
    * @param enumFormString Form parameter enum test (string) (optional, default to -efg)
    * @param queryParams Map of query parameters as name-value pairs
    *   <p>The following elements may be specified in the query map:</p>
@@ -249,7 +249,7 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * test inline additionalProperties
    * 
-    * @param requestBody request body (required)
+   * @param requestBody request body (required)
    */
   @RequestLine("POST /fake/inline-additionalProperties")
   @Headers({
@@ -261,8 +261,8 @@ public interface FakeApi extends ApiClient.Api {
   /**
    * test json serialization of form data
    * 
-    * @param param field1 (required)
-    * @param param2 field2 (required)
+   * @param param field1 (required)
+   * @param param2 field2 (required)
    */
   @RequestLine("GET /fake/jsonFormData")
   @Headers({

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/FakeClassnameTags123Api.java

@@ -18,7 +18,7 @@ public interface FakeClassnameTags123Api extends ApiClient.Api {
   /**
    * To test class name in snake case
    * To test class name in snake case
-    * @param client client model (required)
+   * @param client client model (required)
    * @return Client
    */
   @RequestLine("PATCH /fake_classname_test")

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/PetApi.java

@@ -20,7 +20,7 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Add a new pet to the store
    * 
-    * @param pet Pet object that needs to be added to the store (required)
+   * @param pet Pet object that needs to be added to the store (required)
    */
   @RequestLine("POST /pet")
   @Headers({
@@ -32,8 +32,8 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Deletes a pet
    * 
-    * @param petId Pet id to delete (required)
-    * @param apiKey  (optional)
+   * @param petId Pet id to delete (required)
+   * @param apiKey  (optional)
    */
   @RequestLine("DELETE /pet/{petId}")
   @Headers({
@@ -45,7 +45,7 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Finds Pets by status
    * Multiple status values can be provided with comma separated strings
-    * @param status Status values that need to be considered for filter (required)
+   * @param status Status values that need to be considered for filter (required)
    * @return List<Pet>
    */
   @RequestLine("GET /pet/findByStatus?status={status}")
@@ -89,7 +89,7 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Finds Pets by tags
    * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
-    * @param tags Tags to filter by (required)
+   * @param tags Tags to filter by (required)
    * @return List<Pet>
    */
   @RequestLine("GET /pet/findByTags?tags={tags}")
@@ -133,7 +133,7 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Find pet by ID
    * Returns a single pet
-    * @param petId ID of pet to return (required)
+   * @param petId ID of pet to return (required)
    * @return Pet
    */
   @RequestLine("GET /pet/{petId}")
@@ -145,7 +145,7 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Update an existing pet
    * 
-    * @param pet Pet object that needs to be added to the store (required)
+   * @param pet Pet object that needs to be added to the store (required)
    */
   @RequestLine("PUT /pet")
   @Headers({
@@ -157,9 +157,9 @@ public interface PetApi extends ApiClient.Api {
   /**
    * Updates a pet in the store with form data
    * 
-    * @param petId ID of pet that needs to be updated (required)
-    * @param name Updated name of the pet (optional, default to null)
-    * @param status Updated status of the pet (optional, default to null)
+   * @param petId ID of pet that needs to be updated (required)
+   * @param name Updated name of the pet (optional)
+   * @param status Updated status of the pet (optional)
    */
   @RequestLine("POST /pet/{petId}")
   @Headers({
@@ -171,9 +171,9 @@ public interface PetApi extends ApiClient.Api {
   /**
    * uploads an image
    * 
-    * @param petId ID of pet to update (required)
-    * @param additionalMetadata Additional data to pass to server (optional, default to null)
-    * @param file file to upload (optional, default to null)
+   * @param petId ID of pet to update (required)
+   * @param additionalMetadata Additional data to pass to server (optional)
+   * @param file file to upload (optional)
    * @return ModelApiResponse
    */
   @RequestLine("POST /pet/{petId}/uploadImage")
@@ -186,9 +186,9 @@ public interface PetApi extends ApiClient.Api {
   /**
    * uploads an image (required)
    * 
-    * @param petId ID of pet to update (required)
-    * @param requiredFile file to upload (required)
-    * @param additionalMetadata Additional data to pass to server (optional, default to null)
+   * @param petId ID of pet to update (required)
+   * @param requiredFile file to upload (required)
+   * @param additionalMetadata Additional data to pass to server (optional)
    * @return ModelApiResponse
    */
   @RequestLine("POST /fake/{petId}/uploadImageWithRequiredFile")

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/StoreApi.java

@@ -18,7 +18,7 @@ public interface StoreApi extends ApiClient.Api {
   /**
    * Delete purchase order by ID
    * For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors
-    * @param orderId ID of the order that needs to be deleted (required)
+   * @param orderId ID of the order that needs to be deleted (required)
    */
   @RequestLine("DELETE /store/order/{orderId}")
   @Headers({
@@ -40,7 +40,7 @@ public interface StoreApi extends ApiClient.Api {
   /**
    * Find purchase order by ID
    * For valid response try integer IDs with value <= 5 or > 10. Other values will generated exceptions
-    * @param orderId ID of pet that needs to be fetched (required)
+   * @param orderId ID of pet that needs to be fetched (required)
    * @return Order
    */
   @RequestLine("GET /store/order/{orderId}")
@@ -52,7 +52,7 @@ public interface StoreApi extends ApiClient.Api {
   /**
    * Place an order for a pet
    * 
-    * @param order order placed for purchasing the pet (required)
+   * @param order order placed for purchasing the pet (required)
    * @return Order
    */
   @RequestLine("POST /store/order")

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/UserApi.java

@@ -18,7 +18,7 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Create user
    * This can only be done by the logged in user.
-    * @param user Created user object (required)
+   * @param user Created user object (required)
    */
   @RequestLine("POST /user")
   @Headers({
@@ -30,7 +30,7 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Creates list of users with given input array
    * 
-    * @param user List of user object (required)
+   * @param user List of user object (required)
    */
   @RequestLine("POST /user/createWithArray")
   @Headers({
@@ -42,7 +42,7 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Creates list of users with given input array
    * 
-    * @param user List of user object (required)
+   * @param user List of user object (required)
    */
   @RequestLine("POST /user/createWithList")
   @Headers({
@@ -54,7 +54,7 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Delete user
    * This can only be done by the logged in user.
-    * @param username The name that needs to be deleted (required)
+   * @param username The name that needs to be deleted (required)
    */
   @RequestLine("DELETE /user/{username}")
   @Headers({
@@ -65,7 +65,7 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Get user by user name
    * 
-    * @param username The name that needs to be fetched. Use user1 for testing. (required)
+   * @param username The name that needs to be fetched. Use user1 for testing. (required)
    * @return User
    */
   @RequestLine("GET /user/{username}")
@@ -77,8 +77,8 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Logs user into the system
    * 
-    * @param username The user name for login (required)
-    * @param password The password for login in clear text (required)
+   * @param username The user name for login (required)
+   * @param password The password for login in clear text (required)
    * @return String
    */
   @RequestLine("GET /user/login?username={username}&password={password}")
@@ -137,8 +137,8 @@ public interface UserApi extends ApiClient.Api {
   /**
    * Updated user
    * This can only be done by the logged in user.
-    * @param username name that need to be deleted (required)
-    * @param user Updated user object (required)
+   * @param username name that need to be deleted (required)
+   * @param user Updated user object (required)
    */
   @RequestLine("PUT /user/{username}")
   @Headers({

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java

@@ -35,7 +35,7 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Animal {
   @JsonProperty("className")
-  private String className = null;
+  private String className;
 
   @JsonProperty("color")
   private String color = "red";

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java

@@ -27,22 +27,22 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Capitalization {
   @JsonProperty("smallCamel")
-  private String smallCamel = null;
+  private String smallCamel;
 
   @JsonProperty("CapitalCamel")
-  private String capitalCamel = null;
+  private String capitalCamel;
 
   @JsonProperty("small_Snake")
-  private String smallSnake = null;
+  private String smallSnake;
 
   @JsonProperty("Capital_Snake")
-  private String capitalSnake = null;
+  private String capitalSnake;
 
   @JsonProperty("SCA_ETH_Flow_Points")
-  private String scAETHFlowPoints = null;
+  private String scAETHFlowPoints;
 
   @JsonProperty("ATT_NAME")
-  private String ATT_NAME = null;
+  private String ATT_NAME;
 
   public Capitalization smallCamel(String smallCamel) {
     this.smallCamel = smallCamel;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java

@@ -28,7 +28,7 @@ import org.openapitools.client.model.Animal;
 
 public class Cat extends Animal {
   @JsonProperty("declawed")
-  private Boolean declawed = null;
+  private Boolean declawed;
 
   public Cat declawed(Boolean declawed) {
     this.declawed = declawed;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java

@@ -27,10 +27,10 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Category {
   @JsonProperty("id")
-  private Long id = null;
+  private Long id;
 
   @JsonProperty("name")
-  private String name = null;
+  private String name;
 
   public Category id(Long id) {
     this.id = id;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java

@@ -28,7 +28,7 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class ClassModel {
   @JsonProperty("_class")
-  private String propertyClass = null;
+  private String propertyClass;
 
   public ClassModel propertyClass(String propertyClass) {
     this.propertyClass = propertyClass;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java

@@ -27,7 +27,7 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Client {
   @JsonProperty("client")
-  private String client = null;
+  private String client;
 
   public Client client(String client) {
     this.client = client;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java

@@ -28,7 +28,7 @@ import org.openapitools.client.model.Animal;
 
 public class Dog extends Animal {
   @JsonProperty("breed")
-  private String breed = null;
+  private String breed;
 
   public Dog breed(String breed) {
     this.breed = breed;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java

@@ -64,7 +64,7 @@ public class EnumArrays {
   }
 
   @JsonProperty("just_symbol")
-  private JustSymbolEnum justSymbol = null;
+  private JustSymbolEnum justSymbol;
 
   /**
    * Gets or Sets arrayEnum

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java

@@ -65,7 +65,7 @@ public class EnumTest {
   }
 
   @JsonProperty("enum_string")
-  private EnumStringEnum enumString = null;
+  private EnumStringEnum enumString;
 
   /**
    * Gets or Sets enumStringRequired
@@ -105,7 +105,7 @@ public class EnumTest {
   }
 
   @JsonProperty("enum_string_required")
-  private EnumStringRequiredEnum enumStringRequired = null;
+  private EnumStringRequiredEnum enumStringRequired;
 
   /**
    * Gets or Sets enumInteger
@@ -143,7 +143,7 @@ public class EnumTest {
   }
 
   @JsonProperty("enum_integer")
-  private EnumIntegerEnum enumInteger = null;
+  private EnumIntegerEnum enumInteger;
 
   /**
    * Gets or Sets enumNumber
@@ -181,7 +181,7 @@ public class EnumTest {
   }
 
   @JsonProperty("enum_number")
-  private EnumNumberEnum enumNumber = null;
+  private EnumNumberEnum enumNumber;
 
   @JsonProperty("outerEnum")
   private OuterEnum outerEnum = null;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java

@@ -32,43 +32,43 @@ import org.threeten.bp.OffsetDateTime;
 
 public class FormatTest {
   @JsonProperty("integer")
-  private Integer integer = null;
+  private Integer integer;
 
   @JsonProperty("int32")
-  private Integer int32 = null;
+  private Integer int32;
 
   @JsonProperty("int64")
-  private Long int64 = null;
+  private Long int64;
 
   @JsonProperty("number")
-  private BigDecimal number = null;
+  private BigDecimal number;
 
   @JsonProperty("float")
-  private Float _float = null;
+  private Float _float;
 
   @JsonProperty("double")
-  private Double _double = null;
+  private Double _double;
 
   @JsonProperty("string")
-  private String string = null;
+  private String string;
 
   @JsonProperty("byte")
-  private byte[] _byte = null;
+  private byte[] _byte;
 
   @JsonProperty("binary")
-  private File binary = null;
+  private File binary;
 
   @JsonProperty("date")
-  private LocalDate date = null;
+  private LocalDate date;
 
   @JsonProperty("dateTime")
-  private OffsetDateTime dateTime = null;
+  private OffsetDateTime dateTime;
 
   @JsonProperty("uuid")
-  private UUID uuid = null;
+  private UUID uuid;
 
   @JsonProperty("password")
-  private String password = null;
+  private String password;
 
   public FormatTest integer(Integer integer) {
     this.integer = integer;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java

@@ -27,10 +27,10 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class HasOnlyReadOnly {
   @JsonProperty("bar")
-  private String bar = null;
+  private String bar;
 
   @JsonProperty("foo")
-  private String foo = null;
+  private String foo;
 
    /**
    * Get bar

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java

@@ -33,10 +33,10 @@ import org.threeten.bp.OffsetDateTime;
 
 public class MixedPropertiesAndAdditionalPropertiesClass {
   @JsonProperty("uuid")
-  private UUID uuid = null;
+  private UUID uuid;
 
   @JsonProperty("dateTime")
-  private OffsetDateTime dateTime = null;
+  private OffsetDateTime dateTime;
 
   @JsonProperty("map")
   private Map<String, Animal> map = null;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java

@@ -28,10 +28,10 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Model200Response {
   @JsonProperty("name")
-  private Integer name = null;
+  private Integer name;
 
   @JsonProperty("class")
-  private String propertyClass = null;
+  private String propertyClass;
 
   public Model200Response name(Integer name) {
     this.name = name;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java

@@ -27,13 +27,13 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class ModelApiResponse {
   @JsonProperty("code")
-  private Integer code = null;
+  private Integer code;
 
   @JsonProperty("type")
-  private String type = null;
+  private String type;
 
   @JsonProperty("message")
-  private String message = null;
+  private String message;
 
   public ModelApiResponse code(Integer code) {
     this.code = code;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java

@@ -28,7 +28,7 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class ModelReturn {
   @JsonProperty("return")
-  private Integer _return = null;
+  private Integer _return;
 
   public ModelReturn _return(Integer _return) {
     this._return = _return;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java

@@ -28,16 +28,16 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Name {
   @JsonProperty("name")
-  private Integer name = null;
+  private Integer name;
 
   @JsonProperty("snake_case")
-  private Integer snakeCase = null;
+  private Integer snakeCase;
 
   @JsonProperty("property")
-  private String property = null;
+  private String property;
 
   @JsonProperty("123Number")
-  private Integer _123number = null;
+  private Integer _123number;
 
   public Name name(Integer name) {
     this.name = name;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java

@@ -28,7 +28,7 @@ import java.math.BigDecimal;
 
 public class NumberOnly {
   @JsonProperty("JustNumber")
-  private BigDecimal justNumber = null;
+  private BigDecimal justNumber;
 
   public NumberOnly justNumber(BigDecimal justNumber) {
     this.justNumber = justNumber;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java

@@ -28,16 +28,16 @@ import org.threeten.bp.OffsetDateTime;
 
 public class Order {
   @JsonProperty("id")
-  private Long id = null;
+  private Long id;
 
   @JsonProperty("petId")
-  private Long petId = null;
+  private Long petId;
 
   @JsonProperty("quantity")
-  private Integer quantity = null;
+  private Integer quantity;
 
   @JsonProperty("shipDate")
-  private OffsetDateTime shipDate = null;
+  private OffsetDateTime shipDate;
 
   /**
    * Order Status
@@ -77,7 +77,7 @@ public class Order {
   }
 
   @JsonProperty("status")
-  private StatusEnum status = null;
+  private StatusEnum status;
 
   @JsonProperty("complete")
   private Boolean complete = false;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java

@@ -28,13 +28,13 @@ import java.math.BigDecimal;
 
 public class OuterComposite {
   @JsonProperty("my_number")
-  private BigDecimal myNumber = null;
+  private BigDecimal myNumber;
 
   @JsonProperty("my_string")
-  private String myString = null;
+  private String myString;
 
   @JsonProperty("my_boolean")
-  private Boolean myBoolean = null;
+  private Boolean myBoolean;
 
   public OuterComposite myNumber(BigDecimal myNumber) {
     this.myNumber = myNumber;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java

@@ -31,13 +31,13 @@ import org.openapitools.client.model.Tag;
 
 public class Pet {
   @JsonProperty("id")
-  private Long id = null;
+  private Long id;
 
   @JsonProperty("category")
   private Category category = null;
 
   @JsonProperty("name")
-  private String name = null;
+  private String name;
 
   @JsonProperty("photoUrls")
   private List<String> photoUrls = new ArrayList<String>();
@@ -83,7 +83,7 @@ public class Pet {
   }
 
   @JsonProperty("status")
-  private StatusEnum status = null;
+  private StatusEnum status;
 
   public Pet id(Long id) {
     this.id = id;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java

@@ -27,10 +27,10 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class ReadOnlyFirst {
   @JsonProperty("bar")
-  private String bar = null;
+  private String bar;
 
   @JsonProperty("baz")
-  private String baz = null;
+  private String baz;
 
    /**
    * Get bar

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java

@@ -27,7 +27,7 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class SpecialModelName {
   @JsonProperty("$special[property.name]")
-  private Long $specialPropertyName = null;
+  private Long $specialPropertyName;
 
   public SpecialModelName $specialPropertyName(Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java

@@ -27,10 +27,10 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class Tag {
   @JsonProperty("id")
-  private Long id = null;
+  private Long id;
 
   @JsonProperty("name")
-  private String name = null;
+  private String name;
 
   public Tag id(Long id) {
     this.id = id;

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java

@@ -27,28 +27,28 @@ import io.swagger.annotations.ApiModelProperty;
 
 public class User {
   @JsonProperty("id")
-  private Long id = null;
+  private Long id;
 
   @JsonProperty("username")
-  private String username = null;
+  private String username;
 
   @JsonProperty("firstName")
-  private String firstName = null;
+  private String firstName;
 
   @JsonProperty("lastName")
-  private String lastName = null;
+  private String lastName;
 
   @JsonProperty("email")
-  private String email = null;
+  private String email;
 
   @JsonProperty("password")
-  private String password = null;
+  private String password;
 
   @JsonProperty("phone")
-  private String phone = null;
+  private String phone;
 
   @JsonProperty("userStatus")
-  private Integer userStatus = null;
+  private Integer userStatus;
 
   public User id(Long id) {
     this.id = id;