Jason Hunter has published an interesting article about new features added to servlet 2.5. The focus of this article is like most of the JEE 5 goals all about simplification, easy of use, this is done by leveraging Java5 annotations (resources refences, life cycle support,...), some improvements around the web.xml, and cross context sessions support.
Javaworld: Jason Hunter's 'New features added to Servlet 2.5'
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