JBossAS6 Scala dependency injection

[djheisterberg]

I'm having an issue with injection of EntityManagers, EJBs, etc. in scala code.  Thankfully it's easily reproducible in java, for example:

public class DAO {

    @PersistenceContext

    private EntityManager em;

    ...

This works just fine.  But in scala:

class DAO {

    @PersistenceContext

    private var em: EntityManager = null

    ...

fails with

javax.ejb.EJBException: java.lang.IllegalArgumentException: failed to set value org.jboss.jpa.tx.TransactionScopedEntityManager@14aad613 with setter public javax.persistence.EntityManager DAO.em()

You can reproduce this in the java code with

public class DAO {

    @PersistenceContext

    private EntityManager em;

    public EntityManager em() {return em;}

    ...

which is essentially what scala does.  It seems JBoss is getting confused and using setter injection rather than field -- you can verify the annotation is on the field.  Glassfish v3 works fine.  Is there some way to force JBoss to use field injection?

[jaikiran]

David, welcome to the forums!

This is a bug which was reported last week here http://community.jboss.org/thread/160976?tstart=30. It will be fixed soon (and will be available in 6.0.1 of JBoss AS). I'm just waiting for a JIRA project to be setup so that it can be tracked accordingly.

[djheisterberg]

Thanks, Jaikiran, I just discovered that other thread myself.  I hope this can be fixed soon, it has a serious impact on Scala applications.  Weld, though, handles this case correctly.