[jboss-user] [JBoss Seam] - Re: Can't inject entityManager into application component?

[RobJellinghaus]

That's a nice stab at an explanation, but it can't be the whole story.  Here's a session-scoped component that's been working just fine in my application for months now:
@Name("replogSession")
  | @Startup
  | @Scope(SESSION)
  | public class ReplogSession {
  | ...
  |    @In(create=true)
  |    private transient EntityManager entityManager;
  | 
  |    @In
  |    private Replog replogApplication; // local interface of the stateful session bean above
  | 
  | ...
  |    public Changeset createChangeset (String description) {
  | ...
  |       Query query = entityManager.createQuery("from RepObject ro where ro.replicatedChangeset is null and " +
  |               "not exists (from RepObject ro2 where ro2.replicatedChangeset is not null " +
  |               "and ro2.version = ro.version and ro2.replicatedKey = ro.replicatedKey)");
  |       List<RepObject> list = query.getResultList();
  | ...
  | }
That's a plain old session-scoped POJO that has an EntityManager injected into it with @In.  Works just great!  I've never needed to use @PersistenceContext anywhere else in my app.  And I have an EntityManager Seam component in my resources/WEB-INF/components.xml:
<component name="entityManager" class="org.jboss.seam.core.ManagedPersistenceContext">
  | <property name="persistenceUnitJndiName">java:/entityManagerFactory</property>
  | </component>
So why doesn't Seam's application scope support injecting that EntityManager with @In, when Seam's session scope does support it?

Cheers!
Rob

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