Hi! This class loader was provided as a way to allow loadtime weaving on java 4, before the java.lang.instrument package became available. Hence, to run your code in standalone mode with loadtime weaving enabled, I advise you to use the javaagent option, which is currently the standard way of doing this. To see how to do this in practice, please have a look at our tutorial. All the standalone examples we provide there can be run with the agent enabled. Regards View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4113444#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...