hi, got the following messages when i tried to log in, previously it was okay...

2005-02-01 12:01:11,004 ERROR [org.apache.coyote.tomcat5.CoyoteAdapter] An 
exception or error occurred in the container during the request processing
java.lang.NullPointerException
        at java.util.Arrays.mergeSort(Arrays.java:1152)
        at java.util.Arrays.sort(Arrays.java:1079)
        at org.apache.catalina.realm.GenericPrincipal.(GenericPrincipal.java:77)
        at 
org.jboss.web.tomcat.security.JBossGenericPrincipal.(JBossGenericPrincipal.java:40)
        at 
org.jboss.web.tomcat.security.JBossSecurityMgrRealm.getCachingPrincpal(JBossSecurityMgrRealm.java:342)
        at 
org.jboss.web.tomcat.security.JBossSecurityMgrRealm.authenticate(JBossSecurityMgrRealm.java:257)
        at 
org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:235)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:446)
        at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:54)
        at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
        at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
        at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
        at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:534)


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