Error Handling

[Tim Corless]

I found that I have a NullPointerException in the my prerender code of my ViewController but I don't get an error page.  I have set EXCEPTION_DISPATCH_PATH and it looks like when Shale does the redirect to my error page, the redirect causes an IllegalStateException.  I have MyFaces default error handling on but I don't get an error page at all.  Does anyone know how I get my error page to display?
 
<context-param>
    <param-name>org.apache.shale.view.EXCEPTION_DISPATCH_PATH</param-name>
    <param-value>/actions/app/Error.action</param-value>
</context-param>
 
[2009-05-05 08:39:27,566] [WebContainer : 20] *ERROR* org.apache.myfaces.lifecycle.PhaseListenerManager - Exception in PhaseListener RENDER_RESPONSE(6) afterPhase
java.lang.IllegalStateException: Cannot forward. Response already committed.
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:157)
at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:425)
at org.apache.shale.view.faces.ViewPhaseListener.afterPhaseExceptionCheck(ViewPhaseListener.java:202)
 
Thanks
-Tim

[Cyril Bouteille-2]

Tim, it's likely because the error happened during the rendering phase
after the beginning of the HTML has already been flushed on the response
socket...
You have a couple of options:
1) move your offending code into prerender event and add an <s:subview>
very high in your page markup so it's executed before a lot of markup is
written on the socket, or
2) increase the page buffer size to be larger than the content before
your exception is triggered, e.g. <%@ page buffer="10kb" %>
Hope it helps,
--
Cyril Bouteille
TravelMuse, Inc.

Tim Corless wrote:

> I found that I have a NullPointerException in the my prerender code of my ViewController but I don't get an error page.  I have set EXCEPTION_DISPATCH_PATH and it looks like when Shale does the redirect to my error page, the redirect causes an IllegalStateException.  I have MyFaces default error handling on but I don't get an error page at all.  Does anyone know how I get my error page to display?
>  
> <context-param>
>     <param-name>org.apache.shale.view.EXCEPTION_DISPATCH_PATH</param-name>
>     <param-value>/actions/app/Error.action</param-value>
> </context-param>
>  
> [2009-05-05 08:39:27,566] [WebContainer : 20] *ERROR* org.apache.myfaces.lifecycle.PhaseListenerManager - Exception in PhaseListener RENDER_RESPONSE(6) afterPhase
> java.lang.IllegalStateException: Cannot forward. Response already committed.
> at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:157)
> at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:425)
> at org.apache.shale.view.faces.ViewPhaseListener.afterPhaseExceptionCheck(ViewPhaseListener.java:202)
>  
> Thanks
> -Tim
>