[jboss-user] [JBoss Seam] - class cast exception using managed persistence context

[arussel]

I am using jboss-seam-1.2.1.GA in jboss 4.0.5 .
I followed the doc 8.3.1 on using seam managed persistence and get the following error
when seam try to inject the entity manager:
Caused by: java.lang.ClassCastException: org.jboss.ejb3.entity.InjectedEntityManagerFactory
        at org.jboss.seam.core.ManagedPersistenceContext.getEntityManagerFactoryFromJndiOrValueBinding(ManagedPersistenceContext.java:160)
        at org.jboss.seam.core.ManagedPersistenceContext.initEntityManager(ManagedPersistenceContext.java:77)
        at org.jboss.seam.core.ManagedPersistenceContext.getEntityManager(ManagedPersistenceContext.java:105)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.jboss.seam.util.Reflections.invoke(Reflections.java:20)
        at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:123)
        at org.jboss.seam.Component.callComponentMethod(Component.java:1834)
        at org.jboss.seam.Component.unwrap(Component.java:1860)
        at org.jboss.seam.Component.getInstance(Component.java:1657)

I am using a loader in jboss-app.xml and I can see the factory in jndi:
  +- EntityManagerFactory (class: org.jnp.interfaces.NamingContext)
  |   +- foo (class: org.jboss.ejb3.entity.InjectedEntityManagerFactory)

any help welcome,
thanks

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