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POPSJBoss Seam I actually took a look at this yesterday. It is really justa big set of glue code that can be used to paste various technologies together. It makes heavy use of java annotations and integrates pretty well with EJB 3.0. The biggest downside is that you really have to buy into all of the technologies that it is built around, if you want to use Struts or Tapestry instead of JSF you are pretty much SOL.