jpa-2.0

Does anyone know a link, post, book or something else where are explained and nominalized all properties that you need and can use in persistence.xml file? Piotr Nowicki The JPA 2.0 supported properties ( javax.persistence.* ) can be found in JPA 2.0 specification . Vendor-specific properties can be found in appropriate vendor documentation: Hibernate properties ( hibernate.* ) EclipseLink properties ( eclipselink.* ) Ilya Full list of properties, that hibernate uses, you can find in class org\hibernate\cfg\Environment.java in Hibernate distribution. Javadoc here I think there are actually 2

I'm trying to use JPA 2.0 to create polymorphic entities with generic relations. There should be two tables, an event table and a notification table. Inside those table are concrete entities that are related to one another, like so: Event <---------- Notification<X extends Event> | | LoginEvent <------ LoginNotification extends Notification<LoginEvent> Logically this should be possible in hibernate, as it is possible in SQL: +----------+ +----------+ | Event | | Notif | +----------+ +----------+ | | | Id | | Id | <- | Evt_id | | Type | <- | Type | | ... | | ... | +----------+ +----------+ This

This is an academic question; I have no broken code in relation to this. I just want to expand my understanding of what is happening under the hood. The code pattern I have been using (copied from books and tutorials) in my JPA DAO for my typical JSF web applications is basically this: public class someDAO { @PersistenceContext protected EntityManager em; @Resource private UserTransaction utx; public void persist(Entity entity) { try { utx.begin(); em.persist(entity); utx.commit(); } catch ( // gawd awful long list of possible exceptions ) // etc So my questions are as follows: Why are the

I am trying to write a NOT IN constraint using JPA Criteria . I've tried something like this: builder.not(builder.in(root.get(property1))); though I know it will not work. In the above syntax, how can I add the collection / list against which property1 that will be checked? jYeory builder.not(root.get({field_name}).in(seqs)) seqs is collection. 来源： https://stackoverflow.com/questions/5115422/not-in-constraint-using-jpa-criteria

Consider the scenario two methods exists in different stateless bean public class Bean_A { Bean_B beanB; // Injected or whatever public void methodA() { Entity e1 = // get from db e1.setName("Blah"); entityManager.persist(e1); int age = beanB.methodB(); } } public class Bean_B { //Note transaction @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) public void methodB() { // complex calc to calculate age } } The transaction started by BeanA.methodA would be suspended and new transaction would be started in BeanB.methodB. What if the methodB needs to access same entity that was