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 [EMAIL PROTECTED]
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);
}
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