Temat: Data Binding w Spring 4

Cześć,
mam problem. Chciałbym zamieniać mapę wartość na obiekt.

Object newObject = getClazz().getConstructor().newInstance();

BeanWrapper db = new BeanWrapperImpl(newObject);

db.setPropertyValues(values);

newObject = db.getWrappedClass();

getSession().saveOrUpdate(newObject);

getSession().refresh(newObject);

ten kod wywala mi wyjątek:

Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'groups'; 

nested exception is java.lang.IllegalStateException: Cannot convert value of type 

[java.lang.String] to required type [pl.flomedia.springtpl.models.Group] 

for property 'groups[0]': no matching editors or conversion strategy found

Wiem że muszę napisać jakie konwertery ale jakie? Napisałem taki:

public class StringToGroupConverter implements Converter<String, Group> {



    @Autowired

    private GroupService service;



    public Group convert(String source) {



        return service.get(Long.valueOf(source));



    }



}

i dodałem go na dwa sposoby ani jeden nic nie daje:

//    public ConversionService conversionService(){

//        DefaultConversionService dcs = new DefaultConversionService();

//        dcs.addConverter(new StringToAbstractEntityConverter());

//        dcs.addConverter(new ArrayListToListConverter());

//        dcs.addConverter(new StringToGroupConverter());

//        return dcs;

//    }



    @Override

    protected void addFormatters(FormatterRegistry registry) {

        registry.addConverter(new StringToGroupConverter());

        registry.addConverter(new ArrayListToListConverter());

        registry.addConverter(new StringToAbstractEntityConverter());

    }

    

Co źle robię?