That one'll do 'er. I've updated the example test to include some logic which includes a wait (as this is an async call), which doesn't kill the race condition, but is enough to ensure the hare beats the tortoise 99% of the time. Don't run it twice though without server restart, may have uncovered another classloading issue on uninstall/install? ERROR [AbstractKernelController] Error installing to Real: name=vfsfile:/home/alrubinger/business/jboss/wc/jbossas/trunk/ejb3/output/test-lib/ejbthree1123.jar state=PostClassLoader mode=Manual requiredState=Real | org.jboss.deployers.spi.DeploymentException: Error deploying ejbthree1123.jar: Error creating ejb container TestStatelessBean: java.lang.ClassNotFoundException: Invalid use of destroyed classloader, UCL destroyed at: | at org.jboss.ejb3.deployers.Ejb3Deployer.deploy(Ejb3Deployer.java:158) S, ALR View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4109606#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...