I was using JBoss AOP load-time with JDK1.4. Now trying to use it with jrockit-R26.4.0-jdk1.5.0_06 I get the following error : java.lang.NoClassDefFoundError: org/jboss/mx/loading/HeirarchicalLoaderRepository3 at org.jboss.aop.deployment.JBossScopedClassLoaderHelper.isScopedClassLoader(JBossScopedClassLoaderHelper.java:64) at org.jboss.aop.deployment.JBossScopedClassLoaderHelper.ifScopedDeploymentGetScopedParentUclForCL(JBossScopedClassLoaderHelper.java:44) at org.jboss.aop.AspectManager.instance(AspectManager.java:334) at org.jboss.aop.deployment.AspectManagerService$1.transform(AspectManagerService.java:216) I have download jboss-aop_1.5.2GA and I'm using jbossas-4.0.5GA. I've tried pluggable-implementor.jar and jrockit-pluggable-implementor.jar from lib-50 but none is working. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3992548#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...