code: public void registerJsonValueProcessor( String key, JsonValueProcessor jsonValueProcessor ) {
        if( key != null && jsonValueProcessor != null ) {
           keyMap.put( key, jsonValueProcessor );
        }
     }
docs: Registers a JsonValueProcessor.<br>
  [Java -&gt; JSON]
  
  @param key the property name to use as key
  @param jsonValueProcessor the processor to register