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java.lang.NullPointerException: 	at weblogic.security.acl.TTLCache.hash(TTLCache.java:348)	at weblogic.security.acl.TTLCache.findEntry(TTLCache.java:480)	at weblogic.security.acl.TTLCache.get(TTLCache.java:340)	at weblogic.security.acl.CachingRealm.getUserEntry(CachingRealm.java:1100)	at weblogic.security.acl.CachingRealm.authenticate(CachingRealm.java:1206)	at weblogic.security.acl.CachingRealm.getUser(CachingRealm.java:1178)	at weblogic.security.acl.Realm.authenticate(Realm.java:181)	at weblogic.security.acl.Realm.getAuthenticatedName(Realm.java:199)	at weblogic.security.acl.internal.Security.authenticate(Security.java:81)	at weblogic.servlet.internal.ServletContextImpl.checkAuthenticate(ServletContextImpl.java:1617)	at weblogic.servlet.internal.ServletContextImpl.checkABasic(ServletContextImpl.java:1699)	at weblogic.servlet.internal.ServletContextImpl.checkA(ServletContextImpl.java:1662)	at weblogic.servlet.internal.ServletContextImpl.checkAccess(ServletContextImpl.java:1546)	at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:738)	at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:707)	at weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:251)	at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:369)	at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:269)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135)