Same problem... Eclipse 3.2.1 and JBoss IDE 1.6 In the error log : !ENTRY org.eclipse.jface 4 2 2006-11-20 11:14:10.031 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface". !STACK 0 java.lang.NoClassDefFoundError: org/eclipse/jdt/internal/debug/ui/launcher/JavaLaunchConfigurationTab at java.lang.ClassLoader.defineClass1(Native Method) .... any idea ? jalla : what last beta did you install to fix it ? Thanks a lot !! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987249#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...