Yep you can use the WAB (Web Application Bundle or WAR+Bundle) support that was added in the 4.2 enterprise spec release [1] to support all the servlet 2.5 and JSP 2.1 specifications. The eclipse gemini project [2] has support for this specification and I've certainly used filters with this.
There's even a chapter dedicated to web applications and services in our book which should allow you to try this out for your self with some canned examples.
Regards,
Dave
[1]
http://www.osgi.org/Release4/Download
[2]
http://www.eclipse.org/gemini/web/
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