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java.lang.NullPointerException: 	at weblogic.rmi.cluster.WeightBasedReplicaHandler.chooseReplica(	at weblogic.rmi.cluster.BasicReplicaHandler.loadBalance(	at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(	at weblogic.rmi.internal.ProxyStub.invoke(	at $Proxy1.findByPrimaryKey(Unknown Source)	at ProductClient.main(