code: protected Map jsonMap() {
          checkJsonContentType();
          try {
              return JsonHelper.toMap(getRequestString());
          } catch (IOException e) {
              throw new WebException(e);
          }
      }
docs: Converts posted JSON map to a Java Map. Example JSON map: <code>{"name":"John", "age":21}</code>.
  
  @return Java Map converted from posted JSON string map.