Looks like an OpenJDK6 issue where the permission check for getParent of a classloader is failing with an NPE because probably the parent class loader is null (boot CL). | 14:40:13,679 ERROR [AbstractKernelController] Error installing to Described: name=deployers-classloader:0.0.0$MODULE state=PreInstall | java.lang.NullPointerException | at java.security.AccessControlContext.checkPermission(AccessControlContext.java:330) | at java.security.AccessController.checkPermission(AccessController.java:553) | at java.lang.SecurityManager.checkPermission(SecurityManager.java:549) | at java.lang.ClassLoader.getParent(ClassLoader.java:1241) | at org.jboss.aop.asintegration.jboss5.SecurityActions$GetParentAction$2$1.run(SecurityActions.java:57) | at org.jboss.aop.asintegration.jboss5.SecurityActions$GetParentAction$2$1.run(SecurityActions.java:55) | at java.security.AccessController.doPrivileged(Native Method) | at org.jboss.aop.asintegration.jboss5.SecurityActions$GetParentAction$2.getParent(SecurityActions.java:53) | at org.jboss.aop.asintegration.jboss5.SecurityActions.getParent(SecurityActions.java:77) | at org.jboss.aop.asintegration.jboss5.VFSClassLoaderDomainRegistry.getClassLoaderDomainForLoader(VFSClassLoaderDomainRegistry.java:181) | at org.jboss.aop.asintegration.jboss5.VFSClassLoaderDomainRegistry.getRegisteredDomain(VFSClassLoaderDomainRegistry.java:165) | at org.jboss.aop.asintegration.jboss5.VFSClassLoaderScopingPolicy.getDomain(VFSClassLoaderScopingPolicy.java:68) | at org.jboss.aop.AspectManager.instance(AspectManager.java:248) | at org.jboss.aop.AspectManager.instance(AspectManager.java:234) | at org.jboss.aop.microcontainer.beans.AspectManagerFactory.getAspectManager(AspectManagerFactory.java:46) | at org.jboss.aop.microcontainer.integration.AOPDependencyBuilder.getDependencies(AOPDependencyBuilder.java:102) | Any second thoughts? This is only on openjdk6 and not on Sun JDK6. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4242715#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...