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Error when trying to use an extended persistence context in EJB 3

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I am trying to using a stateful session bean to update an entity using extended persistence context. But I get the following error when trying to access the stateful bean from a standalone class:

Caused by: java.lang.IllegalStateException: Extended Persistence Contexts can only be invoked from within the context of the stateful session bean that declares the Extended Persistence Context.
at weblogic.deployment.ExtendedEntityManagerProxyImpl.getPersistenceContext(
at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(
at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(
at weblogic.deployment.ExtendedEntityManagerProxyImpl.invoke(
at $Proxy114.toString(Unknown Source)
at java.lang.String.valueOf(
at java.lang.StringBuilder.append(
at containerNamagedEM.DeptServiceImpl.init(
... 40 more

Below is my stateful bean class

The standalone test class to access the session bean:

I am using weblogic 10 and below is my persistence.xml:

Can someone help me to solve this issue?

Thanks in advance,
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