My guess: either JAVA_HOME or JBOSS_HOME contains a space in the path name. To verify this, open a command prompt and enter: set JBOSS_HOME set JAVA_HOME set ANT_OPTS If any of those setting have spaces in the path name, move the item elsewhere. As an example, my JDK is at c:\apps\java\jdk1.6.0_11 and I have JBoss AS at d:\opt\jboss\jboss-5.0.0.GA. (By the way, you do not have to reinstall the JDK - you can simply move it and reset JAVA_HOME.) If that does not show anything, then edit the run.bat script for Ant, run it again, and post the output. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4198477#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...