genericdao

I know this is very often asked , but I cannot find a working solution : This is my AbstractDAO : public interface AbstractDao<T> { public T get(Serializable id); //other CRUD operations } And this is my JPA's implementation: public abstract class AbstractDaoJpaImpl<T> implements AbstractDao<T> , Serializable { protected EntityManager em; protected Class<T> clazz; @SuppressWarnings("unchecked") public AbstractDaoJpaImpl() { ParameterizedType genericSuperclass = (ParameterizedType) getClass().getGenericSuperclass(); this.clazz = (Class<T>) genericSuperclass.getActualTypeArguments()[0]; } public

I have configured a custom generic service DAO for my spring / hibernate project - the idea being that I can reuse it easily from my controllers. It essentially looks like this: public class DefaultService<T> { private Class<T> e; public String className(Class<T> e) { String clip = e.getName(); clip = clip.substring(clip.lastIndexOf('.') + 1, clip.length()); return clip; } public List<T> getAll(Integer status) { Session session = sessionFactory.getCurrentSession(); Query query = session.createQuery("FROM " + className(e) + " WHERE status = " + status); return query.list(); } ... Which gets

Following my previous question, DAO and Service layers (JPA/Hibernate + Spring) , I decided to use just a single DAO for my data layer (at least at the beginning) in an application using JPA/Hibernate, Spring and Wicket. The use of generic CRUD methods was proposed, but I'm not very sure how to implement this using JPA. Could you please give me an example or share a link regarding this? Here is an example interface: public interface GenericDao<T, PK extends Serializable> { T create(T t); T read(PK id); T update(T t); void delete(T t); } And an implementation: public class GenericDaoJpaImpl<T,