You can extend RequestProcessor using a intercepting filter pattern for
preprocessing
(http://java.sun.com/blueprints/patterns/InterceptingFilter.html), so you
don't have to check the session in every jsp.
public class MyRequestProcessor extends RequestProcessor {
PreProcessingFilter firstPreProcessingFilter;
public MyRequestProcessor() {
firstPreProcessingFilter =
new SessionPreProcessingFilter(
new AuthenticationPreProcessingFilter(null));
}
protected ActionForward processActionPerform(
HttpServletRequest request, HttpServletResponse response,
Action action, ActionForm form, ActionMapping mapping) throws
IOException, ServletException {
ActionForward actionForward = firstPreProcessingFilter.process(
request, response, action, form, mapping);
if (actionForward == null) {
return super.processActionPerform(request, response, action,
form, mapping);
} else {
return actionForward;
}
}
}
/**
* A base clase for all preprocessing filters. Usually, concrete filters
only
* need to provide an implementation of <code>doProcess</code>.
*/
public abstract class PreProcessingFilter {
private PreProcessingFilter nextFilter;
public PreProcessingFilter(PreProcessingFilter nextFilter) {
this.nextFilter = nextFilter;
}
/**
* Calls upon <code>doProcess</code>, and if necessary, continues to
call
* <code>process</code> on the next filter.
*/
public ActionForward process(HttpServletRequest request,
HttpServletResponse response, Action
action,
ActionForm form,
ActionMapping mapping) throws IOException,
ServletException {
ActionForward actionForward = null;
/* Process this filter. */
actionForward = doProcess(request, response, action, form, mapping);
/* Process next filter in the chain. */
if ((actionForward == null) && (nextFilter != null)) {
return nextFilter.process(request, response, action, form,
mapping);
} else {
return actionForward;
}
}
/**
* Does the processing of this filter.
*
* @return <code>null</code> if the next filter must be processed; an
* <code>ActionForward</code> otherwise
*/
protected abstract ActionForward doProcess(HttpServletRequest request,
HttpServletResponse response,
Action action, ActionForm
form,
ActionMapping mapping) throws
IOException, ServletException,
InternalErrorException;
}
> -----Mensaje original-----
> De: koen boutsen [mailto:[EMAIL PROTECTED]
> Enviado el: viernes, 10 de octubre de 2003 13:32
> Para: Struts Users Mailing List
> Asunto: redirect problem
>
>
> Hi
> If my httpsession is invalid, I want to send the user to the
> logon page. I tried it in different ways, but get an error
> everytime I tried it like this : (sessionIsValid is a
> attribute in the session. If this attribute is null, it means
> that my session does no longer exist).
>
>
> <logic:notPresent name="sessionIsValid" scope="session">
> <logic:forward name="/sessionTimedOut"/> </logic:notPresent>
>
>
> This is the error I get :
> javax.servlet.jsp.JspException: Exception redirecting for
> name /sessionTimedOut: java.lang.IllegalStateException
> [10/10/03 13:08:25:033 CEST] 5355efea SystemErr R
> at
> org.apache.struts.taglib.logic.ForwardTag.doEndTag(ForwardTag.
> java:164)
> [10/10/03 13:08:25:033 CEST] 5355efea SystemErr R
> at org.apache.jsp._specialCode1._jspService(_specialCode1.java:164)
> [10/10/03 13:08:25:033 CEST] 5355efea SystemErr R
> at
> com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJs
> pBase.java:89)
> [10/10/03 13:08:25:033 CEST] 5355efea SystemErr R
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> [10/10/03 13:08:25:043 CEST] 5355efea SystemErr R
> at
> com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapp
> er.service(JspServlet.java:344)
> [10/10/03 13:08:25:043 CEST] 5355efea SystemErr R
> at
> com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(
> JspServlet.java:598)
> [10/10/03 13:08:25:043 CEST] 5355efea SystemErr R
>
> Thanks for any help.
>
> Koen
>
>
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