Try this:
your persistence.xml file must look like this

  | <persistence>
  |      <persistence-unit name="foodb">
  |         <jta-data-source>java/DefaultDS</jta-data-source>
  |        <properties>
  |            <property name="jboss.entity.manager.jndi.name" 
value="java:/EntityManager/foodb"/>
  |        </properties>
  |      </persistence-unit>
  | </persistence>
  | 

and then in your code just look up EntityManager like this

  | EntityManager em = 
(EntityManager)getJBossSpecificInitialContext().lookup("java:/EntityManager/foodb");
  | 

I hope this can help u to roll your effort.




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