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java.lang.NullPointerException: 	at weblogic.utils.collections.NumericValueHashtable.containsKey(NumericValueHashtable.java:138)	at weblogic.cluster.replication.ReplicationManager.getSecondaryDistributionNames(ReplicationManager.java:908)	at weblogic.cluster.ClusterRuntime.getSecondaryDistributionNames(ClusterRuntime.java:100)	at java.lang.reflect.Method.invoke(Native Method)	at weblogic.management.internal.DynamicMBeanImpl.getAttribute(DynamicMBeanImpl.java:432)	at weblogic.management.internal.DynamicMBeanImpl.getAttribute(DynamicMBeanImpl.java:394)	at com.sun.management.jmx.MBeanServerImpl.getAttribute(MBeanServerImpl.java:1181)	at com.sun.management.jmx.MBeanServerImpl.getAttribute(MBeanServerImpl.java:1151)	at weblogic.management.internal.RemoteMBeanServerImpl_WLSkel.invoke(RemoteMBeanServerImpl_WLSkel.java:206)	at weblogic.rmi.internal.BasicServerAdapter.invoke(BasicServerAdapter.java:373)	at weblogic.rmi.internal.BasicServerAdapter.invoke(BasicServerAdapter.java:237)	at weblogic.rmi.internal.BasicRequestHandler.handleRequest(BasicRequestHandler.java:118)	at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:17)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)