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

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java.lang.NullPointerException:
at weblogic.servlet.internal.session.ReplicatedSessionContext.getSessionInternal(ReplicatedSessionContext.java:480)
at weblogic.servlet.internal.ServletRequestImpl.getValidSession(ServletRequestImpl.java:2489)
at weblogic.servlet.security.internal.SecurityModule$SessionRetrievalAction.run(SecurityModule.java:637)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.security.internal.SecurityModule.getUserSession(SecurityModule.java:612)
at weblogic.servlet.security.internal.SecurityModule.beginCheck(SecurityModule.java:153)
at weblogic.servlet.security.internal.BasicSecurityModule.checkA(BasicSecurityModule.java:46)
at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:145)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3539)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

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