javax.ejb.EJBException: nested exception is: java.lang.NullPointerExceptionjava.lang.NullPointerException

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nested exception is: java.lang.NullPointerExceptionjava.lang.NullPointerException
javax.ejb.EJBException: nested exception is: java.lang.NullPointerExceptionjava.lang.NullPointerException
at schemes.ejb.SchemesEJBBean1952982800_ConcreteImpl.jdoLookupPersistenceManagerFactory(SchemesEJBBean1952982800_ConcreteImpl.java:1451)
at schemes.ejb.SchemesEJBBean1952982800_ConcreteImpl.setEntityContext(SchemesEJBBean1952982800_ConcreteImpl.java:1481)
at com.sun.ejb.containers.EntityContainer$EntityContextFactory.create(EntityContainer.java:2599)
at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject(NonBlockingPool.java:176)
at com.sun.ejb.containers.util.pool.NonBlockingPool.getObject(NonBlockingPool.java:133)
at com.sun.ejb.containers.EntityContainer.getPooledEJB(EntityContainer.java:1896)
at com.sun.ejb.containers.EntityContainer.getContext(EntityContainer.java:560)
at schemes.ejb.SchemesEJBBean1952982800_ConcreteImpl_RemoteHomeImpl.findAll(SchemesEJBBean1952982800_ConcreteImpl_RemoteHomeImpl.java:99)
at schemes.ejb._SchemesEJBHome_Stub.findAll(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.forte4j.j2ee.ejbtest.webtest.InvocableMethod$MethodIM.invoke(InvocableMethod.java:233)
at com.sun.forte4j.j2ee.ejbtest.webtest.EjbInvoker.getInvocationResults(EjbInvoker.java:98)
at com.sun.forte4j.j2ee.ejbtest.webtest.DispatchHelper.getForward(DispatchHelper.java:191)

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