ServletFilters and Servlets: Is Running a "Request" in the same Thread?

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joes - 14 Mar 2007 17:35 GMT

Hello

I have a basic question regarding Servlet and ServletFilters. If I do
have a filter, can I assume that the request is running in the same
thread? Or could it be that the filter is running in another context
as the servlet?
Background: we have an existing framework which is using ThreadLocal
variables and therefore it is essential to know how the specification
of a servletciontainer does look like and if someone has experiences
on that?

Many thanks

regards
Mark

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Adam Maass - 17 Mar 2007 05:18 GMT

> Hello
>
[quoted text clipped - 8 lines]
>
> Many thanks

I'm not exactly sure what the specification says, but the reference
implementation (IE, Tomcat) runs the ServletFilter and the chained target
Servlet in the same thread for the same request.

It's a pretty safe bet that other implementations of the Servlet
specification do the same thing. Even if the spec itself leaves this detail
underspecified.

-- Adam Maass

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Lew - 17 Mar 2007 15:53 GMT

> I'm not exactly sure what the specification says, but the reference
> implementation (IE, Tomcat) runs the ServletFilter and the chained
[quoted text clipped - 3 lines]
> specification do the same thing. Even if the spec itself leaves this
> detail underspecified.

Don't you mean "unspecified"? Meaning you can't count on the behavior?

-- Lew

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ServletFilters and Servlets: Is Running a "Request" in the same Thread?

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