2005-10-04 13:08:28,312 ERROR 
[org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/portal].[PortalServlet]]
 Servlet.service() for servlet PortalServlet threw exception

java.lang.NullPointerException

        at 
org.jboss.portal.server.servlet.AbstractMainServlet.doGet(AbstractMainServlet.java:68)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.jboss.portal.core.servlet.TransactionFilter.doFilter(TransactionFilter.java:79)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)

        at 
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)

        at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:157)

        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)

        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)

        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)

        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)

        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)

        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)

        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)

        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

        at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)

        at java.lang.Thread.run(Unknown Source)

i can solved this problem

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