code: void createMethodBody(String classname, ExecutableElement methodElement, List<String> arguments, Writer writer) throws IOException {
  		String methodName = getMethodName(methodElement);
  		boolean ws = isWebsocketDataService(methodElement);
  		String args = stringJoinAndDecorate(arguments, COMMA, new NothingDecorator());
  		String keys = computeKeys(methodElement, arguments);
  		createReturnOcelotPromiseFactory(classname, methodName, ws, args, keys, writer);
  	}
docs: Create javascript method body
  
  @param classname
  @param methodElement
  @param arguments
  @param writer
  @throws IOException