code: public JsonValueProcessor findJsonValueProcessor( Class propertyType ) {
        if( !typeMap.isEmpty() ) {
           Object key = jsonValueProcessorMatcher.getMatch( propertyType, typeMap.keySet() );
           return (JsonValueProcessor) typeMap.get( key );
  
        }
        return null;
     }
docs: Finds a JsonValueProcessor registered to the target type.<br>
  Returns null if none is registered.<br>
  [Java -&gt; JSON]
  
  @param propertyType a class used for searching a JsonValueProcessor.