Most likely the Eclipse driver files that are in your local repository are not downloaded correctly. Did you already try to unzip them manually? The most easy way to build the Eclipse plugin is through a simple script that looks like the following: cvs -d :pserver:anonymous@anoncvs.forge.jboss.com:/cvsroot/jbpm co -r HEAD jbpm.3/designer/jpdl/org.jbpm.gd.jpdl.build | cd jbpm.3/designer/jpdl/org.jbpm.gd.jpdl.build | ant Of course you would need to set the correct variables in your local build.properties file and have the correct Eclipse drivers available in your local repository. Btw. headless Eclipse plugin builds are a real PITA. You probably will not need to do this initially. The most easy way to start working on the designer plugin is to checkout the module jbpm.3/designer/jpdl/org.jbpm.gd.jpdl as a project in your workspace. You can always create a deployable plugin by using the Eclipse export mechanism. Regards, Koen View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4053856#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...