Hi Kukeltje, believe me or not, I have solved the problem by removing eclipse folder under JBPM_ROOT manually and started main build again. As far as I concluded, the reason of my pain was that eclipse related libraries were not correctly downloaded. WTP SDK zip was corrupted and get.dependencies task did not compain. After I removed eclipse/webtools from my repository and ran get.dependencies again, wtp zip is downloaded properly. So to summarize: - ant clean does not delete eclipse folder - get.dependencies does not inform if local copy of zip matches remote one. - once when eclipse folder is created (in my case with malformed WTP zip) the HELL starts. Anyway, thank you for your hints and I hope that this bad experience of mine could be useful for the community. Regards Milan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980683#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...