Thanks for the quick answer. So what I would have to do is: - Implement my own class that conforms to the interface "java.lang.instrument.ClassFileTransformer" - Register an object of that class with the PluggableInstrumentor and then I'm ready to go? So in code: public class MyTransformer implements ClassFileTransformer | { | public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, | ProtectionDomain protectionDomain, byte[] classfileBuffer) | throws IllegalClassFormatException | { | //do something ... | } | } | public class someOtherClass | { //all static for simplicity | public static MyTransformer transformer= new MyTransformer(); | static{ | PluggableInstrumentor.getInstrumentor().addTransformer(transformer) | } | } Is that correct? Kind regards Frank View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4185369#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...