Joseph Ottinger wrote:
A client of mine has been trying out WW1.3 and the exception handling around execute() yielded a question and suggestion. The issue is that throwing exceptions either bubbles up to the webapp layer, or involves a pattern where a common ActionSupport derivative wraps a method call in various try/catch blocks in an attempt to control routing of the exception.
Using the servlet container's exception handling is workable, but ugly, especially in the case where a common exception can be thrown. The pattern where a "process()" method is wrapped is better, but not by much.
What I'd thought of was adding an extra method to Action and ActionSupport. The Action method's signature might look like this:
public String handleException(Throwable t) throws Throwable;
The ActionSupport implementation:
public String handleException(Throwable t) throws Throwable { throw t; }
What would happen is that the invoker, in a try/catch, would call handleException() to "handle" any exceptions. The default behaviour would be to re-throw the exception, which would yield the exact same behaviour WebWork has today.
However... you could ALSO override handleException() to add an error to the error array, and return INPUT (or ERROR, or whatever) instead, which would allow an action hierarchy to easily compartmentalize exception handling, without FORCING an application to do so.
Thoughts? Insults? Points?
------------------------------------------------------------------- Joseph B. Ottinger http://enigmastation.com IT Consultant [EMAIL PROTECTED] J2EE Editor - Java Developer's Journal [EMAIL PROTECTED]
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