Struts + Erro

Pessoal,

Depois que eu fico um tempo (1 hora) sem mexer na aplicacao ocorre um erro, que esta me parecendo relacionado com o tempo de sessao…
A minha arquitetura é Hibernate + Weblogic + Struts…
alguem ja teve alguma experiencia com esse erro?

[quote]

<Jun 25, 2004 2:02:31 PM BRT> <Error> <HTTP> <BEA-101020> <[ServletContext(id=3741817,name=rns-web,context-path=/rns-web)] Servlet failed with Exception
java.lang.NullPointerException
at org.apache.struts.action.RequestProcessor.processPath(RequestProcessor.java:767)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:220)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
> [/quote]

Desde ja Agradecido…