[jboss-user] [JBoss Seam] - Re: When to use @PersistenceContext vrs @In EntityManager (S

[reind]

I have a SFSB that is invoked in multiple requests without a clear Begin or End. It uses a SLSB to get a reference to an entity.

Here's an example from my project (note this worked in 1.2.1):

Foo is session scoped, so I expect its instance variables to stay around and managed. When I invoke a() the 'entity' ref is set. When I then invoke b(), entity is not-null and I can even get lazy loaded properties.

With Seam 1.2.1 this worked, now with 2.0 it no longer works. I'm not sure what's changed between versions that would cause this.

With 2.0. I get a NPE when trying to access 'entity' from a seperate request. I can get around this by creating a @Begin @Create public void init() {} method in Foo, but that's an ugly workaround. 

The seam SMPC in a Session bean should be session scoped, and any entities that it retrieves should also be managed throughout the session, right? 


  | @Name
  | @Scope(STATEFULL)
  | @Stateful
  | public class FooImpl implenents Foo {
  |    @In
  |    EntityManager entityManager;
  | 
  |    @In
  |    Bar bar;
  |  
  |    private entity;
  | 
  |     // several methods that access 'entity' and access lazy loaded  
  |     // properties of entity
  |     public void a() {
  |         entity = bar.getEntity();
  |         // do something
  |     }
  | 
  |     public void b() {
  |        entity.getProperty();
  |        entity.getLazyProperty();
  |     }
  | }
  | 
  | @Name
  | @Stateless
  | public class BarImpl implenents Bar {
  |    @In
  |    EntityManager entityManager;
  | 
  |    public Entity getEntity() {
  |        entityManager.find(Bar.class, ...);
  |    }
  | }
  | 

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