What is JAVA_HOME set to? Look at the console log or boot.log and post these lines: 13:42:17,681 INFO [ServerInfo] Java version: 1.6.0_07,Sun Microsystems Inc. 13:42:17,681 INFO [ServerInfo] Java VM: Java HotSpot(TM) Server VM 10.0-b23,Sun Microsystems Inc. These identify the version of Java used. Are you using JBossAS 5.0.0.CR1? I have no problems running JBossAS 5.0.0.CR1 with JDK 6u7, using both EJB and POJO web services. (Well, not no problems, there is still a deployment ordering issue. But I am not getting the 'setProperty' error.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174727#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...