Problem accessing a service that extends a generic superclass

I have a simple service:

public class ArticleService {

   public Article findArticle(Long id) {

   ..

   }

   public void persist(Article artilce) {

   ..

   }

}

I use it with RequestFactory like this:

@Service(value = ArticleService.class, locator = DefaultServiceLocator.class)

public interface ArticleRequestContext extends RequestContext {

..

}

everything works as expected...

then I tried to refactor the service:

public class ArticleService extends BasicService<Article, ArticleDao> {

...

}

wherein I moved methods like persist(), etc to the generic BasicService. Now, requests for persist() do no longer work.

any ideas? is there a problem with generic classes?

thanks in advance,

-g.

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