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java.lang.NullPointerException: 	at java.util.Hashtable.get(Hashtable.java:320)	at weblogic.security.acl.internal.FileRealm.getUser(FileRealm.java:359)	at weblogic.security.acl.internal.FileRealm.getUser(FileRealm.java:375)	at weblogic.security.acl.Realm.authenticate(Realm.java:198)	at weblogic.security.acl.Realm.getAuthenticatedName(Realm.java:229)	at weblogic.security.acl.internal.Security.authenticate(Security.java:113)	at weblogic.servlet.security.internal.CertSecurityModule.checkUserPerm(CertSecurityModule.java:75)	at weblogic.servlet.security.internal.SecurityModule.beginCheck(SecurityModule.java:138)	at weblogic.servlet.security.internal.CertSecurityModule.checkA(CertSecurityModule.java:46)	at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:109)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:1107)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1388)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:133)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:116)