[Java][Client][RestTemplate] Do not create new Object for empty body

modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/api.mustache

@@ -61,7 +61,7 @@ public class {{classname}} {
 {{/externalDocs}}
      */
     public {{#returnType}}{{{returnType}}} {{/returnType}}{{^returnType}}void {{/returnType}}{{operationId}}({{#allParams}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}) throws RestClientException {
-        Object {{localVariablePrefix}}postBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}new Object(){{/bodyParam}};
+        Object {{localVariablePrefix}}postBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}null{{/bodyParam}};
         {{#allParams}}{{#required}}
         // verify the required parameter '{{paramName}}' is set
         if ({{paramName}} == null) {

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/api/FakeApi.java

@@ -300,7 +300,7 @@ public Client testClientModel(Client client) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testEndpointParameters(BigDecimal number, Double _double, String patternWithoutDelimiter, byte[] _byte, Integer integer, Integer int32, Long int64, Float _float, String string, File binary, LocalDate date, OffsetDateTime dateTime, String password, String paramCallback) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'number' is set
         if (number == null) {
@@ -385,7 +385,7 @@ public void testEndpointParameters(BigDecimal number, Double _double, String pat
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testEnumParameters(List<String> enumHeaderStringArray, String enumHeaderString, List<String> enumQueryStringArray, String enumQueryString, Integer enumQueryInteger, Double enumQueryDouble, List<String> enumFormStringArray, String enumFormString) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/fake").build().toUriString();
 
@@ -462,7 +462,7 @@ public void testInlineAdditionalProperties(Map<String, String> requestBody) thro
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testJsonFormData(String param, String param2) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'param' is set
         if (param == null) {

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/api/PetApi.java

@@ -89,7 +89,7 @@ public void addPet(Pet pet) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deletePet(Long petId, String apiKey) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -128,7 +128,7 @@ public void deletePet(Long petId, String apiKey) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public List<Pet> findPetsByStatus(List<String> status) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'status' is set
         if (status == null) {
@@ -165,7 +165,7 @@ public List<Pet> findPetsByStatus(List<String> status) throws RestClientExceptio
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public List<Pet> findPetsByTags(List<String> tags) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'tags' is set
         if (tags == null) {
@@ -203,7 +203,7 @@ public List<Pet> findPetsByTags(List<String> tags) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Pet getPetById(Long petId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -276,7 +276,7 @@ public void updatePet(Pet pet) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void updatePetWithForm(Long petId, String name, String status) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -320,7 +320,7 @@ public void updatePetWithForm(Long petId, String name, String status) throws Res
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File file) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -366,7 +366,7 @@ public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File f
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public ModelApiResponse uploadFileWithRequiredFile(Long petId, File requiredFile, String additionalMetadata) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/api/StoreApi.java

@@ -54,7 +54,7 @@ public void setApiClient(ApiClient apiClient) {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deleteOrder(String orderId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'orderId' is set
         if (orderId == null) {
@@ -88,7 +88,7 @@ public void deleteOrder(String orderId) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Map<String, Integer> getInventory() throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/store/inventory").build().toUriString();
 
@@ -119,7 +119,7 @@ public Map<String, Integer> getInventory() throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Order getOrderById(Long orderId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'orderId' is set
         if (orderId == null) {

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/api/UserApi.java

@@ -147,7 +147,7 @@ public void createUsersWithListInput(List<User> user) throws RestClientException
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deleteUser(String username) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -184,7 +184,7 @@ public void deleteUser(String username) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public User getUserByName(String username) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -223,7 +223,7 @@ public User getUserByName(String username) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public String loginUser(String username, String password) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -263,7 +263,7 @@ public String loginUser(String username, String password) throws RestClientExcep
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void logoutUser() throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/user/logout").build().toUriString();
 

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

@@ -300,7 +300,7 @@ public Client testClientModel(Client client) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testEndpointParameters(BigDecimal number, Double _double, String patternWithoutDelimiter, byte[] _byte, Integer integer, Integer int32, Long int64, Float _float, String string, File binary, LocalDate date, OffsetDateTime dateTime, String password, String paramCallback) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'number' is set
         if (number == null) {
@@ -385,7 +385,7 @@ public void testEndpointParameters(BigDecimal number, Double _double, String pat
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testEnumParameters(List<String> enumHeaderStringArray, String enumHeaderString, List<String> enumQueryStringArray, String enumQueryString, Integer enumQueryInteger, Double enumQueryDouble, List<String> enumFormStringArray, String enumFormString) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/fake").build().toUriString();
 
@@ -462,7 +462,7 @@ public void testInlineAdditionalProperties(Map<String, String> requestBody) thro
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void testJsonFormData(String param, String param2) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'param' is set
         if (param == null) {

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

@@ -89,7 +89,7 @@ public void addPet(Pet pet) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deletePet(Long petId, String apiKey) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -128,7 +128,7 @@ public void deletePet(Long petId, String apiKey) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public List<Pet> findPetsByStatus(List<String> status) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'status' is set
         if (status == null) {
@@ -165,7 +165,7 @@ public List<Pet> findPetsByStatus(List<String> status) throws RestClientExceptio
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public List<Pet> findPetsByTags(List<String> tags) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'tags' is set
         if (tags == null) {
@@ -203,7 +203,7 @@ public List<Pet> findPetsByTags(List<String> tags) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Pet getPetById(Long petId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -276,7 +276,7 @@ public void updatePet(Pet pet) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void updatePetWithForm(Long petId, String name, String status) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -320,7 +320,7 @@ public void updatePetWithForm(Long petId, String name, String status) throws Res
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File file) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {
@@ -366,7 +366,7 @@ public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File f
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public ModelApiResponse uploadFileWithRequiredFile(Long petId, File requiredFile, String additionalMetadata) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'petId' is set
         if (petId == null) {

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

@@ -54,7 +54,7 @@ public void setApiClient(ApiClient apiClient) {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deleteOrder(String orderId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'orderId' is set
         if (orderId == null) {
@@ -88,7 +88,7 @@ public void deleteOrder(String orderId) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Map<String, Integer> getInventory() throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/store/inventory").build().toUriString();
 
@@ -119,7 +119,7 @@ public Map<String, Integer> getInventory() throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public Order getOrderById(Long orderId) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'orderId' is set
         if (orderId == null) {

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

@@ -147,7 +147,7 @@ public void createUsersWithListInput(List<User> user) throws RestClientException
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void deleteUser(String username) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -184,7 +184,7 @@ public void deleteUser(String username) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public User getUserByName(String username) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -223,7 +223,7 @@ public User getUserByName(String username) throws RestClientException {
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public String loginUser(String username, String password) throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         // verify the required parameter 'username' is set
         if (username == null) {
@@ -263,7 +263,7 @@ public String loginUser(String username, String password) throws RestClientExcep
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
     public void logoutUser() throws RestClientException {
-        Object postBody = new Object();
+        Object postBody = null;
 
         String path = UriComponentsBuilder.fromPath("/user/logout").build().toUriString();