I had the same problem and after rooting around the forums here I discovered that the latest stable build of the JBoss IDE is not compatible with Eclipse 3.2 as it relies on a class that was removed from Eclipse 3.2 So your options are: 1. Use Eclipse 3.1 and latest stable IDE release 2. Use Eclipse 3.2 with the latest IDE Beta (2.0.0) To do this just use the following URL in the update manager: http://download.jboss.org/jbosside/updates/development I think to get it to work I also had to install another set of packages (EMF) through the update manager but you may have them already installed. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4033763#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...