Hi, the "homepage" of the ejb3 plugin ( http://www.jboss.org/ejb3/ejb3plugin.html ) provides a short installation guide, but it lacks the information that Ant is required. Well, the error message is quite meaningful, but thus I needed two installation attempts ;-). Exception in thread "main" java.lang.RuntimeException: Environment Variable 'ANT | _HOME' must be specified. | at org.jboss.ejb3.installer.Installer.getAntProcess(Installer.java:562) | at org.jboss.ejb3.installer.Installer.getAntProcess(Installer.java:536) | at org.jboss.ejb3.installer.Installer.runAnt(Installer.java:499) | at org.jboss.ejb3.installer.Installer.install(Installer.java:253) | at org.jboss.ejb3.installer.Installer.main(Installer.java:194) | Shutdown Hook called... | Starting Cleanup... Please add two more sentences to the page. The name of the installer jar has changed slightly, too: "jboss-ejb3-plugin-x.x.x-installer.jar" Thanks Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240429#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...