EntityManager in jmx.MBean

[Marcus Didius Falco]

JBoss 4.2.2

I need to use the EntityManager inside an JMX MBean

<?xml version="1.0" encoding="UTF-8" ?>
<persistence>
  <persistence-unit name="bafoeg3sked">
    <jta-data-source>java:/bafoeg21DS</jta-data-source>
    <properties>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
     
      <property name="jboss.entity.manager.jndi.name" value="java:/bafoeg3EntityManagerSKED" />
    </properties>
  </persistence-unit>
</persistence>

Context ctx;
try {
	ctx = (Context) new InitialContext();
	em = (EntityManager) ctx.lookup("java:/bafoeg3EntityManagerSKED");
} catch (NamingException e) {
	log.error(e);
}

At this point the EntityManager is not null

org.jboss.ejb3.entity.TransactionScopedEntityManager@7663a6

However at

Query query = em.createNamedQuery("findGruppeByValue");

I get the following exception:

java.lang.NullPointerException
        at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getNonTxEntityManag
er(ManagedEntityManagerFactory.java:59)
        at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getTransactionScope
dEntityManager(ManagedEntityManagerFactory.java:164)
        at org.jboss.ejb3.entity.TransactionScopedEntityManager.createNamedQuery
(TransactionScopedEntityManager.java:139)
        at bafoeg21.scheduler.util.SchedulerConfig.buildSkedStore(SchedulerConfi
g.java:522)

Any ideas what might be the cause?

Thanks,

Hans