code: private <D,S> JMapper<D,S> getJMapper(HashMap<String,JMapper> map,Object source){
  		Class<?> sourceClass = source instanceof Class?((Class<?>)source):source.getClass();
  		JMapper<D,S> jMapper = map.get(sourceClass.getName());
  		if(jMapper == null) Error.classNotMapped(source, configuredClass);
  		return jMapper;
  	}
docs: Returns the desired JMapper instance.
  @param map the map of relationships
  @param source key of the map
  @return the instance of JMapper