@Inject only works in page, component and mixin classes
(as stated on the mailinglist some hours ago :))
Services can be injected into other services by declaring them in the
constructor of the service:
your dao constructor:
...
public DAO (EntityManager em){...}
your module:
public static void bind(ServiceBinder binder) {
binder.bind(DAOInterface.class,DAOImpl.class)
}
or you can have your own build method
buildDAO(EntityManager em) {
return new DAOImpl(em)
}
or even:
buildDAO(EntityManager em) {
DAO d = new DAOImpl();
d.setEntityManager(em);
return d;
}
This works only if the EntityManager itself is declared as a Tapestry IOC
service
i'd also recommend you to look into the source of the Tapestry-Hibernate
project
to see how it works. see Tapestry-IOC documentation for more details,
especially
the tapestry-ioc cookbook
g,
kris
Leon Derks <[EMAIL PROTECTED]>
28.04.2008 14:40
Bitte antworten an
"Tapestry users" <[email protected]>
An
"[email protected] >> Tapestry users" <[email protected]>
Kopie
Thema
T5: JPA EntityManager + Tapestry Injection
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);
}
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
