[eclipselink-users] T5: JPA EntityManager + Tapestry Injection

[Leon Derks <leon.derks@xxxxxxxxxx>]

I have added an JPA entity manager to my AppModule, in the same way this 
is done for an HibernateSessionManager/Session in the tapestry-hibernate 
project.
See the code below for some details.

I inject this entity manager with the @Inject into my DAO object.
@Inject
private EntityManager entityManager

In my DAO method I use the injected entityManager to build queries like 
this:
entityManager.createNamedQuery("findProductsByCategory").setParameter("productCategory", 
ProductCategory.Lamps).getResultList();

But the problem is that the entityManager is null. It seems that the 
entityManager is not correctly injected into my DAO class.
Because when I use the entityManager directly in my Java Page class and 
execute the same code, everything works well.

Java Page code:
public void onActivate() {
   // this results in an null pointer exception.
   products = productDAO.findAllByCategory(ProductCategory.Lamps);

   //this is working.
   products = 
entityManager.createNamedQuery("findProductsByCategory").setParameter("productCategory", 
ProductCategory.Lamps).getResultList();
}

What do I need to do so I can use my DAO classes?

Leon


AppModule.java:
   /**
    * The JPAEnitityManagerService manages the entity manager on a 
per-thread/per-request basis. A {@link 
javax.persistence.EntityTransaction} is created
    * initially, and is committed at the end of the request.
    */
   @Scope(PERTHREAD_SCOPE)
   public static JPAEntityManagerService build(PerthreadManager 
perthreadManager) {
       JPAEntityManagerServiceImpl jpaService = new 
JPAEntityManagerServiceImpl();
       perthreadManager.addThreadCleanupListener(jpaService);
       return jpaService;

   }

   public static EntityManager build(JPAEntityManagerService 
jpaService, PropertyShadowBuilder propertyShadowBuilder) {
      return propertyShadowBuilder.build(jpaService, "entityManager", 
EntityManager.class);
   }