I see no point in your question. Since jBPM is an open source project why souldn't it be possible to contribute? And this sticky post here already explains a lot. I checked out the sources a couple of days ago and it worked fine for me using this url: https://anonsvn.jboss.org/repos/jbpm/ Google search for: jBPM "building from source" the second result leads you to this step-by-step manual: http://labs.jboss.com/community/wiki/jBPM4BuildingfromSource%20%20.pdf View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4262944#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...