I have installed Eclipse 3.1 and Jboss 4.0.4.GA. When I start the server using Run.bat -c default, it starts ok, but when I am trying to start it through Eclipse the following error appears: java.lang.NoClassDefFoundError: de Exception in thread "main" I looked up the configuration of the server and I execute the following instrution at system prompt: java -Dprogram.name=run.bat -Djava.endorsed.dirs=C:/Archivos de programa/jboss-4.0.4.GA/bin/../lib/endorsed -Xms128m -Xmx512m The same error appears, so I think the problem is on the arguments. So, what are the right arguments to start the server. Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975300#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...