BaseContainer.preInvoke() has thrown an EJBException

We found this prefix in 5 webpages.
MapChildren (5)Typical messages (1)TraceDetailed Map
  1. javax.ejb.EJBException
    1.   at com.sun.ejb.containers.EntityContainer$EntityContextFactory.create()
    2.   at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject()
    3.   at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject()
    4.   at com.sun.ejb.containers.EntityContainer.getPooledEJB()
    5.   at com.sun.ejb.containers.EntityContainer.getContext()
    6.   at com.sun.ejb.containers.BaseContainer.preInvoke()
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MessageNumber of crashes
nested exception is: java.lang.NullPointerException5
  1. javax.ejb.EJBException
    1.   at com.sun.ejb.containers.EntityContainer$EntityContextFactory.create()
    2.   at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject()
    3.   at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject()
    4.   at com.sun.ejb.containers.EntityContainer.getPooledEJB()
    5.   at com.sun.ejb.containers.EntityContainer.getContext()
    6.   at com.sun.ejb.containers.BaseContainer.preInvoke()
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