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i started Struts 2 tutorial http://www.onepd.com/
The Struts 2 tutorial will help the reader truly understand Struts 2 concepts, it starts with simple examples and explains not only how to use Struts' features, but also how certain features work under the hood; Integrates Struts 2 application with Tiles 2, Freemarker, Spring and Hibernate/JPA.
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Any suggestions or critiques are welcome. http://www.onepd.com