update test, suppress warnings in java apache client (#14098)

Author: wing328

modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/ApiClient.mustache

@@ -782,8 +782,16 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
   }
 
   /**
-   * Deserialize response content
+   * Deserialize response body to Java object according to the Content-Type.
+   *
+   * @param <T> Type
+   * @param response Response
+   * @param valueType Return type
+   * @return Deserialized object
+   * @throws ApiException API exception
+   * @throws IOException IO exception
    */
+  @SuppressWarnings("unchecked")
   public <T> T deserialize(HttpResponse response, TypeReference<T> valueType) throws ApiException, IOException {
     if (valueType == null) {
       return null;

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/apachehttpclient/ApacheHttpClientCodegenTest.java

@@ -1,6 +1,5 @@
 /*
  * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
- * Copyright 2018 SmartBear Software
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/ApiClient.java

@@ -737,8 +737,16 @@ public HttpEntity serialize(Object obj, Map<String, Object> formParams, ContentT
   }
 
   /**
-   * Deserialize response content
+   * Deserialize response body to Java object according to the Content-Type.
+   *
+   * @param <T> Type
+   * @param response Response
+   * @param valueType Return type
+   * @return Deserialized object
+   * @throws ApiException API exception
+   * @throws IOException IO exception
    */
+  @SuppressWarnings("unchecked")
   public <T> T deserialize(HttpResponse response, TypeReference<T> valueType) throws ApiException, IOException {
     if (valueType == null) {
       return null;