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

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java.lang.NullPointerException	at java.util.Hashtable.get(Hashtable.java:320)	at weblogic.security.acl.internal.FileRealm.getUser(FileRealm.java:386)	at weblogic.security.acl.CachingRealm.getUserEntry(CachingRealm.java:829)	at weblogic.security.acl.CachingRealm.getUser(CachingRealm.java:670)	at com.i2.shared.server.weblogic.security.RdbmsRealm51.getUser(RdbmsRealm51.java:232)	at weblogic.security.acl.CachingRealm.authenticate(CachingRealm.java:956)	at weblogic.security.acl.CachingRealm.getUser(CachingRealm.java:863)	at weblogic.security.acl.Realm.authenticate(Realm.java:200)	at weblogic.security.acl.Realm.getAuthenticatedName(Realm.java:233)	at weblogic.security.acl.internal.Security.authenticate(Security.java:116)	at weblogic.servlet.security.internal.SecurityModule.checkAuthenticate(SecurityModule.java:248)	at weblogic.servlet.security.ServletAuthentication.weak(ServletAuthentication.java:208)	at weblogic.servlet.security.ServletAuthentication.weak(ServletAuthentication.java:185)	at weblogic.servlet.security.internal.BasicSecurityModule.checkAuthenticateHeader(BasicSecurityModule.java:65)	at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:121)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:1250)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1631)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)