code: TypeConverter getDeclaredTypeConverter(MappedBy mappedBy) {
          if (null == mappedBy) {
              return null;
          }
          return getDeclaredTypeConverter(mappedBy.typeConverterClass().getName(), mappedBy.typeConverter());
      }
docs: Get declared type converter for a @MappedBy annotation.
  
  @param mappedBy MappedBy annotation
  @return type converter with highest precedence