Redirecting from an External to the error page of my application

Hi,
I am facing an issue while trying to redirect to the error page whenever an exception occurs in my external while the page is being rendered.
Can we redirect from an external to some other page in case of any exception?
Any help in this context is welcomed.

Thanks

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Rick Poulin

Can we redirect from an external to some other page in case of any exception?

Not server side, no. The best you could do with an external is have the component render a bit of Javascript to change the window.location.

Only precontrollers can redirect the page flow on the server side (by returning an appropriate instance of a ForwardAction. Once it gets to the externals, the response has already been initialized and it's too late to redirect. What you should do is retrieve and validate your essential content in a precontroller (and redirect if a failure occurs). To avoid processing the data twice, you can store the validated data in the request (e.g. as a request attribute) so that your external can assume that if it's executing, then the data has been validated and it's available for retrieval somewhere.