diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
index 33c4d1ec91..7909a65a41 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
@@ -671,7 +671,7 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
     public <T> ResponseEntity<T> invokeAPI(String path, HttpMethod method, Map<String, Object> pathParams, MultiValueMap<String, String> queryParams, Object body, HttpHeaders headerParams, MultiValueMap<String, String> cookieParams, MultiValueMap<String, Object> formParams, List<MediaType> accept, MediaType contentType, String[] authNames, ParameterizedTypeReference<T> returnType) throws RestClientException {
         updateParamsForAuth(authNames, queryParams, headerParams, cookieParams);
 
-   	    Map<String,Object> uriParams = new HashMap();
+   	    Map<String,Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         String finalUri = path;
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
index cabd6408ab..2cc373ae78 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
@@ -654,7 +654,7 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         final UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(basePath).path(path);
 
         String finalUri = builder.build(false).toUriString();
-        Map<String, Object> uriParams = new HashMap();
+        Map<String, Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         if (queryParams != null && !queryParams.isEmpty()) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
index 422daa4c21..244cbd852d 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
@@ -627,7 +627,7 @@ public class ApiClient extends JavaTimeFormatter {
     public <T> ResponseEntity<T> invokeAPI(String path, HttpMethod method, Map<String, Object> pathParams, MultiValueMap<String, String> queryParams, Object body, HttpHeaders headerParams, MultiValueMap<String, String> cookieParams, MultiValueMap<String, Object> formParams, List<MediaType> accept, MediaType contentType, String[] authNames, ParameterizedTypeReference<T> returnType) throws RestClientException {
         updateParamsForAuth(authNames, queryParams, headerParams, cookieParams);
 
-   	    Map<String,Object> uriParams = new HashMap();
+   	    Map<String,Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         String finalUri = path;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
index 1912fef80a..37788fa281 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
@@ -622,7 +622,7 @@ public class ApiClient extends JavaTimeFormatter {
     public <T> ResponseEntity<T> invokeAPI(String path, HttpMethod method, Map<String, Object> pathParams, MultiValueMap<String, String> queryParams, Object body, HttpHeaders headerParams, MultiValueMap<String, String> cookieParams, MultiValueMap<String, Object> formParams, List<MediaType> accept, MediaType contentType, String[] authNames, ParameterizedTypeReference<T> returnType) throws RestClientException {
         updateParamsForAuth(authNames, queryParams, headerParams, cookieParams);
 
-   	    Map<String,Object> uriParams = new HashMap();
+   	    Map<String,Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         String finalUri = path;
diff --git a/samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/ApiClient.java
index 8cdcbac35c..7694b7d9b9 100644
--- a/samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/ApiClient.java
@@ -620,7 +620,7 @@ public class ApiClient extends JavaTimeFormatter {
         final UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(basePath).path(path);
 
         String finalUri = builder.build(false).toUriString();
-        Map<String, Object> uriParams = new HashMap();
+        Map<String, Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         if (queryParams != null && !queryParams.isEmpty()) {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
index 74e87d2c7b..3510c9f459 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
@@ -641,7 +641,7 @@ public class ApiClient extends JavaTimeFormatter {
         final UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(basePath).path(path);
 
         String finalUri = builder.build(false).toUriString();
-        Map<String, Object> uriParams = new HashMap();
+        Map<String, Object> uriParams = new HashMap<>();
         uriParams.putAll(pathParams);
 
         if (queryParams != null && !queryParams.isEmpty()) {