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Read the link I posted about the problems with cross-posting. It's very rude because it wastes our time. There are thousands of questions on these forums, so it's a waste of time to answer a question...

http://www.java-forums.org/web-frameworks/48786-using-open-source-project-our-application.html

That almost definitely depends on the project. I'd send the developers an email just to make sure.