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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getJdbcProps(ClusteredSessionContextImpl.java:138) at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getIdsInternal(ClusteredSessionContextImpl.java:38) at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(SessionContext.java:253) at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(SessionContext.java:241) at weblogic.time.common.internal.ScheduledTrigger.executeLocally(ScheduledTrigger.java:225) at weblogic.time.common.internal.ScheduledTrigger.execute(ScheduledTrigger.java:216) at weblogic.time.server.ScheduledTrigger.execute(ScheduledTrigger.java:65) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)