change java default lib to okhttp-gson

modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache

@@ -790,6 +790,7 @@ public class ApiClient {
      * @throws ApiException If fail to deserialize response body, i.e. cannot read response body
      *   or the Content-Type of the response is not supported.
      */
+    @SuppressWarnings("unchecked")
     public <T> T deserialize(Response response, Type returnType) throws ApiException {
         if (response == null || returnType == null) {
             return null;
@@ -984,6 +985,7 @@ public class ApiClient {
      * @param returnType Return type
      * @param callback ApiCallback
      */
+    @SuppressWarnings("unchecked")
     public <T> void executeAsync(Call call, final Type returnType, final ApiCallback<T> callback) {
         call.enqueue(new Callback() {
             @Override

modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/JSON.mustache

@@ -92,6 +92,7 @@ public class JSON {
      * @param returnType The type to deserialize inot
      * @return The deserialized Java object
      */
+    @SuppressWarnings("unchecked")
     public <T> T deserialize(String body, Type returnType) {
         try {
             if (apiClient.isLenientOnJson()) {
@@ -287,4 +288,4 @@ class LocalDateTypeAdapter extends TypeAdapter<LocalDate> {
         }
     }
 }
-{{/java8}}
+{{/java8}}