we are running a JavaEE 6 Environment with EclipseLink and JBoss Weld. For the EntityManager, we currently are using the @ConversationScoped scope and it works very well for the JSF interactions.
We now want to include a @Schedule method for some automated checking of data (check for deadlines etc.). However, i don't know whether this is even possible, as the automated call doesn't seem to create a conversation. This is currently our approach:
@Stateless
public class Scheduler
@Inject
private CampaignService campaignService;
// CampaignService is @ApplicationScoped and uses an EntityManager
@Schedule(second="*/3", ...)
public void checkDeadlines(){
campaignService.getAll() // fetches all campaigns from EntityManager
...
}
}
However, the injection does not work as long as the EntityManager is @ConversationScoped. (ContextNotActiveException)
Is there a possibility to "create" a conversation other than by calling some JSF? Or is the only possibility creating a custom scope, as in How to use CDI-@SessionScoped without a http-session?
If you're going to be using schedulers your best solution is to use @PersistenceContext to get an EntityManager. The other option is to not use a conversation scoped entitymanager (which should be considered bad practice anyway), and use a default scoped or request scoped entitymanager.
I say a conversation scoped entitymanager is bad practice because it can easily lead to lazy initialization issues, detached entities and memory leaks.