RequestFactory Proxies and Generics - Compile problem

[otth2oskier]

I am writing a bunch of screens using CellTable and the AsyncDataProvider along with RequestFactory calls. I would like to get away from the pattern of making a server call for data and a second call for row count to update the AsyncDataProvider's data and row count. I would like create a generic return object that contains both data and count and make only one cal to the server.

My code looks like:

public class Result<T extends EntityBase> {

private final List<T> data;

private final long count;

public Result(List<T> data, long count) {

this.data = data;

this.count = count;

}

public List<T> getData() {

return data;

}

public long getCount() {

return count;

}

}

@ProxyFor(value = Result.class, locator = EntityLocator.class)

public interface ResultProxy<T extends EntityProxy> extends ValueProxy {

List<T> getData();

public long getCount();

}

@Service(value=UserDao.class,locator=BaseServiceLocator.class)

@ExtraTypes({ResultProxy.class})

public interface UserRequest extends RequestContext {

Request<Long> count();

Request<UserProxy> find(Long id);

Request<ResultProxy<UserProxy>> findAll(int firstResult, int maxResults);

Request<Void> persist(UserProxy instance);

Request<Void> remove(UserProxy instance);

}

@Stateless

public class UserDao {

@PersistenceContext(unitName = "acdb")

private EntityManager entityManager;

private static Logger LOGGER = Logger.getLogger(UserDao.class.getName());

public long count() {

...

}

public User find(Long id) {

return entityManager.find(User.class, id);

}

public Result<User> findAll(int firstResult, int maxResults) {

...

}

public void persist(User instance) {

LOGGER.info("Persisting instance:" + instance);

entityManager.merge(instance);

LOGGER.info("Persisted instance:" + instance);

}

public void remove(User instance) {

...

}

}

@ProxyFor(value = User.class, locator = EntityLocator.class)

public interface UserProxy extends EntityProxy {

Long getId();

String getFirstName();

void setFirstName(String firstName);

String getLastName();

void setLastName(String lastName);

}

When I compile, I am getting:

ResultProxy.java:13: warning: Cannot validate this method because the domain mapping for  the return type (java.util.List) could not be resolved to a domain type

UserRequest.java:19: Could not find domain method similar to com.avaya.gwtproto.shared.model.Result<T> findAll(intint)

Lines are highlighted in red above. 

I cannot figure out what I am doing wrong. I am guessing that the compiler is not handling the generics as I would expect it to. I don't want to write a separate return value for each EntityProxy and I don't want to make 2 server calls to get data and count to refresh my CellTable.

[Andrea Boscolo]

I guess, you can't. See http://code.google.com/p/google-web-toolkit/issues/detail?id=6967 and http://code.google.com/p/google-web-toolkit/issues/detail?id=5974

For the 2 server calls you can simply (and probabily better) call two different service methods with two different receivers in the same request context, before firing it (that will end up in a single http request, if I remember right).