The book briefly covers the Ajax support in Struts 2 itself, but tries not to specifically cover any Ajax framework.
The RIA chapter, in addition to covering some simple usecases of the bundled tags, discusses the REST plugin, which can generate JSON, XML, or XHTML, and shows how it might be used by jQuery, EXT, etc.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: Apache Struts 2 Web Application Development