Anyone know the difference between Tomcat Valve and Filter?

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jacksuyu@gmail.com - 04 Nov 2005 23:35 GMT

Seems both could be hooked before servlet be called.

Does Valve work for more than just java servlet/jsp?

Thanks.

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Adam Maass - 05 Nov 2005 04:46 GMT

> Seems both could be hooked before servlet be called.
>
> Does Valve work for more than just java servlet/jsp?

Similar in notion, but at different levels.

"Valve" is Tomcat's specific notion, and they get applied at a higher level
than anything in a specific webapp. Also, they work only in Tomcat.

"Filter" is a Servlet Specification notion and should work in any compliant
servlet container. They get applied at a lower level than all of Tomcat's
Valves.

-- Adam Maass

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jacksuyu@gmail.com - 05 Nov 2005 16:24 GMT

Got it, thanks.
So if I want approach to work cross different application server, i
need to use Filter.

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Juha Laiho - 06 Nov 2005 09:36 GMT

jacksuyu@gmail.com said:

>So if I want approach to work cross different application server, i
>need to use Filter.

Yep. However, consider also the division between your application and the
application server. Think whether the feature you're planning is part of
your application, or is it rather a generic feature of the application
server, which could have uses in other applications as well.

This would be the correct criteria to decide between Valve and Filter.

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Anyone know the difference between Tomcat Valve and Filter?

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