>From: "Mike Quilleash " <[EMAIL PROTECTED]>
>
>Hi all,
>I am trying to come up with a way to catch all exceptions that occur during
>the JSF lifecycle.
>When this happens I want to display a debug page with useful info; stack
>trace, current view,
> component tree, session state etc.
>
>I'm having trouble finding a good place to insert logic like this.
>
>PhaseListener - no good, only run before and after, not during phases.
>Servlet Filter - will catch everything but FacesContext is destroyed by this
>point so no access
> to the component tree.
>FacesServlet - final, not sure I want to override this anyway
>Lifecycle - possibility, but again, not sure I want to override this.
>
>Does anyone have an experience of plugging in a generic exception handler
>somewhere
>in the framework?
>
The Shale view controller [1] subclasses the view root[2][3] in order hook into
the methods on the root that are invoked by the life cycle. This will only
work for the Myfaces JSF 1.1 implementation. The RI 1.1 doesn't use the JSF
component factory to instantiate the view root.
In the shale view controller, you can register your own error page or you can
plug in your own exception handler. In working with the ADF Faces library (not
Trinidad), I had to implement my own exception handler do to competing
extension points.
<context-param>
<param-name>org.apache.shale.view.EXCEPTION_DISPATCH_PATH</param-name>
<param-value>/error.jsf</param-value>
</context-param>
[1] http://shale.apache.org/shale-view/index.html
[2]
http://svn.apache.org/viewvc/shale/framework/trunk/shale-view/src/main/java/org/apache/shale/view/faces/ShaleViewRoot.java?view=markup
[3]
http://svn.apache.org/viewvc/shale/framework/trunk/shale-view/src/main/resources/META-INF/faces-config.xml?view=markup
>Cheers.
>Mike.
Gary
