java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.Hashtable.remove(Hashtable.java:421)
at weblogic.connector.common.internal.LocalTransResourceFactory.delistConnection(LocalTransResourceFactory.java:112)
at weblogic.connector.common.internal.LocalTransResourceFactory.access$0(LocalTransResourceFactory.java:105)
at weblogic.connector.common.internal.LocalTransResourceFactory$ConnectionEventListenerImpl.connectionClosed(LocalTransResourceFactory.java:167)
at com.persistence.turbo.ra.ManagedConnectionImpl.close(ManagedConnectionImpl.java:88)
at com.persistence.turbo.ra.ConnectionImpl.close(ConnectionImpl.java:18)
at weblogic.connector.common.internal.ConnectionWrapper.invoke(ConnectionWrapper.java:59)
at undefined.$Proxy106.close(Unknown Source)
at examples.jconnector.persistence.AccountBean.cleanup(AccountBean.java:381)
at examples.jconnector.persistence.AccountBean.ejbFindByPrimaryKey(AccountBean.java:251)
at examples.jconnector.persistence.AccountBean_jconnector_Impl.ejbFindByPrimaryKey(AccountBean_jconnector_Impl.java:192)
at weblogic.ejb20.manager.BeanManagedPersistenceManager.findByPrimaryKey(BeanManagedPersistenceManager.java:35)
at weblogic.ejb20.manager.BaseEntityManager.findByPrimaryKey(BaseEntityManager.java:458)
at weblogic.ejb20.manager.BaseEntityManager.remoteFindByPrimaryKey(BaseEntityManager.java:395)
at weblogic.ejb20.internal.EntityEJBHome.findByPrimaryKey(EntityEJBHome.java:354)
at examples.jconnector.persistence.AccountBean_jconnector_HomeImpl.findByPrimaryKey(AccountBean_jconnector_HomeImpl.java:101)
at examples.jconnector.persistence.AccountBean_jconnector_HomeImpl_WLSkel.invoke(UnknownSource)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:266)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:96)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:233)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

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