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java.lang.NullPointerException: 	at java.util.Hashtable.get(Hashtable.java:320)	at weblogic.connector.common.internal.ConnectionPoolManager.removeManagedConnectionFactory(ConnectionPoolManager.java:75)	at weblogic.j2ee.ResourceAdapterComponent.undeploy(ResourceAdapterComponent.java:207)	at weblogic.j2ee.Application.undeploy(Application.java:274)	at weblogic.j2ee.J2EEService.undeployApplication(J2EEService.java:227)	at weblogic.management.mbeans.custom.Application.setLocalDeployed(Application.java:366)	at weblogic.management.mbeans.custom.Application.setDeployed(Application.java:296)	at java.lang.reflect.Method.invoke(Native Method)	at weblogic.management.internal.DynamicMBeanImpl.invokeSetter(DynamicMBeanImpl.java:1388)	at weblogic.management.internal.DynamicMBeanImpl.setAttribute(DynamicMBeanImpl.java:881)	at weblogic.management.internal.DynamicMBeanImpl.setAttribute(DynamicMBeanImpl.java:847)	at weblogic.management.internal.ConfigurationMBeanImpl.setAttribute(ConfigurationMBeanImpl.java:295)