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

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java.lang.NullPointerException:
at java.util.Hashtable.put(Hashtable.java:380)
at weblogic.servlet.internal.session.JDBCSessionContext.getJdbcProps(JDBCSessionContext.java:152)
at weblogic.servlet.internal.session.JDBCSessionContext.getIdsInternal(JDBCSessionContext.java:38)
at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(SessionContext.java:257)
at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(SessionContext.java:245)
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)

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