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

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java.lang.NullPointerException:
at weblogic.security.SimpleCallbackHandler.(SimpleCallbackHandler.java:32)
at weblogic.common.internal.RMIBootServiceImpl.authenticate(RMIBootServiceImpl.java:101)
at weblogic.common.internal.RMIBootServiceImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:503)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:393)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:389)
at weblogic.rmi.internal.BasicServerRef.access$300(BasicServerRef.java:56)
at weblogic.rmi.internal.BasicServerRef$BasicExecuteRequest.run(BasicServerRef.java:903)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:179)

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