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Simon,

On 5/15/15 2:26 PM, Pilkington, Simon wrote:
> We recently ran into an issue where the requestDestroyed() method
> of listeners were not being called when exceptions were propagated
> out of our application.
> 
> Looking into the code, it seems related to this[1]. Is this the 
> expected behavior for listeners and we can’t rely on the 
> requestDestroyed() method always being called for a request?

Hmm. Looking at the spec, I don't see any requirement that the
container *must* invoke those event listeners, so I think Tomcat is
in-spec, here.

That being said, I think a reasonable person would expect that the
listener would fire even in the case of an exception condition.

This is something I might want to file with the Servlet EG. At the
very least, they might be able to make a statement about the intent of
the EG, and provide a clarification with the next release of the
Specification. Would you be willing to do that? The Servlet EG's JIRA
instance is dog-slow, but usable.

> One option we have considered is migrating to exclusively using 
> filters and handling the exceptional use case explicitly there. Is 
> there a recommended approach for this use case?

That all depends upon your use case. The Filter interface certainly
allows you to use your own try/catch blocks to make sure you intercept
exceptions that propagate up the stack.

- -chris
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