jpa-2.0

I have few tables with very few entries in them and they will never change dynamically . so i want to cache the whole table in memory to reduce load on DB. I can easily achieve that by a static Map and populating the map in a static block. i was wondering whether the same is possible in a more effective way by Ehcache + hibernate? The advantage of a real second-level cache over a static map is that you get the advantage of in-memory access by still keeping the same way of defining, accessing and traversing your entities: by using the Hibernate session (or entity manager). You may keep

I am using JPA-2.0 with Hibernate in my data access layer. For audit logging purposes, I am using Hibernate's EmptyInterceptor by configuring below property in persistence.xml: <property name="hibernate.ejb.interceptor" value="com.mycom.audit.AuditLogInterceptor" /> Where AuditLogInterceptor extends hibernate's ' org.hibernate.EmptyInterceptor '. public class AuditLogInterceptor extends EmptyInterceptor { private Long userId; public AuditLogInterceptor() {} @Override public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws

Assume I have two classic non-abstract JPA classes: Person and Student. @Entity @Inheritance(strategy = InheritanceType.JOINED) public class Person { @Id @GeneratedValue(strategy = GenerationType.AUTO) private String id; // ... } @Entity public class Student extends Person { // ... } Now person having some id enters the university and becomes a student. How do I process that fact in JPA and keep person's id? student = new Student(); student.setPersonData(person.getPersonData()); student.setId(person.getId()); entityManager.persist(student); Code above produces 'Detached entity passed to

What's going on here? @Stateless @LocalBean public class AppointmentCommentDao { public void delete(long appointmentCommentId) { AppointmentComment ac = em.find(AppointmentComment.class, appointmentCommentId); if (ac != null) { em.merge(ac); em.remove(ac); } } @PersistenceContext private EntityManager em; } On the call to remove I get an IllegalArgumentException with the message being Entity must be managed to call remove: ...., try merging the detached and try the remove again. In your case merge is not needed, because ac is not deattached in any point between em.find and em.remove . In

I have the following entity: @Entity public class TestCaseStep implements JPAEntity<Integer> { ... @Column(name="STEP_NUMBER") private Integer stepNumber; @Enumerated(EnumType.STRING) @Column(name="ACTION") private Action action; **@ManyToOne @JoinColumn(name="connector") private ScriptItem connector;** My attribute ScriptItem is a interface for 3 other classes. Is it possible to configure JPA to set the correct class id in runtime execution? Other resources: public interface ScriptItem { String getValue(); ScriptItemType getType(); } @Entity @Table(name="DAT_FEED_XML") public class FeedXml