I think there's something wrong with the build.xml. When running "ant -Ddatabase=mysql demo.setup.tomcat", during the ant target "install.jbpm.to.tomcat", there's a task that set "database.driver.destination.dir" property, then run target "internal copy database driver". But when running "demo.setup.tomcat", no such property is set, so the mysql-connector-java.jar is copied to the current directory where ant script running. This leads that no mysql driver is installed to JBoss server, so leads to ClassNotFoundException. So is this a problem with the build.xml script? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4264406#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...