How to detect servlet forwarding problem?

Hi all experts,
I have a servlet that forward (using forward method in request dispatcher) the requests to a certain destination URL.
But if that URL is down or not found (like 500 or 404), forward method will not throw exception.
But how do I get the response code in this forwarding? Interpret the response header from output stream of response object? I did not found any related methods in java that can simply allow us to get the response code (only allow us to set but not get).
Thanks a lot!

If you are using JBOSS or other application servers in that web.xml of your application just write
<error-page>
<error-code>404</error-code>
<location>Error.jsp</location>
</error-page>then it will be taken care of by container

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How to detect servlet forwarding problem?

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