FSchumacher commented on a change in pull request #651:
URL: https://github.com/apache/jmeter/pull/651#discussion_r597106256



##########
File path: 
src/protocol/http/src/main/java/org/apache/jmeter/protocol/http/util/GraphQLRequestParamUtils.java
##########
@@ -79,27 +76,32 @@ public static boolean isGraphQLContentType(final String 
contentType) {
      * @throws RuntimeException if JSON serialization fails for some reason 
due to any runtime environment issues
      */
     public static String toPostBodyString(final GraphQLRequestParams params) {
-        final ObjectMapper mapper = new ObjectMapper();
-        final ObjectNode postBodyJson = mapper.createObjectNode();
-        postBodyJson.set(OPERATION_NAME_FIELD,
-                
JsonNodeFactory.instance.textNode(StringUtils.trimToNull(params.getOperationName())));
-
+        final StringBuilder result = new StringBuilder();

Review comment:
       I don't think, that we should add code to `HttpSamplerBase` as it 
doesn't have anything to do with the GraphQL stuff (other than being used by 
the *GraphQlSampler*. I think we should create a new class (we could call it 
`GraphQlSampler` :) ) that extends `HttpSamplerProxy` and overrides the 
`sample` method. The new class could be injected by overriding 
`HttpTestSampleGui#createTestElement()` in `GraphQLHTTPSampler`.
   Alternatively we could try to override the `modifyTestElement` method and do 
the JSON conversion in there, when the test element is being prepared with the 
real data.




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