ok - I think I was on a wild good chase with the manifest, although I suspect it does need some tidying up. Looking at the source for: org.jboss.profiler.agent.Agent.redefine(Class[] clz, boolean instrument) This method appears to the be part involved in instrumenting classes. I assume that without instrumentation, we cannot gather stats. Now the confusing part: redefine is called from the same class at three points: addClasses() removeClasses() setEnabled() each of which is called from the handler. I don't want to add and remove classes manually each time, so I'll concern myself with the enabled method call. Take a look at the method:public static void setEnabled(boolean e) { | if (isRepository()) { | List<Class> l = new ArrayList<Class>(); | | for (Class c : instrumentation.getAllLoadedClasses()) { | String className = c.getName().replace(".", "/"); | | boolean added = false; | for (int i = 0; !added && i < includeList.size(); i++) { | String classes = includeList.get(i); | if (className.startsWith(classes)) { | l.add(c); | added = true; | } | } | } | | Class[] clz = new Class[l.size()]; | for (int i = 0; i < l.size(); i++) { | clz = l.get(i); | } | | if (enabled) { | redefine(clz, true); | } else { | redefine(clz, false); | } | } | } Code will never be instrumented if the repository is disabled (which is the default value) No instrumentation = no stats. So I do the following: configure jboss.profiler.properties with: core=asm (javaassist doesn't seem to work) repository=yes Then: 1) start the application server, and run through my test case. I need to do this to get the classes loaded by the classloader (is there a way to circumvent this?) 2) Using the jmx-console/socket client I enable the profiler. This causes the classes which are in the classloader to be reloaded. 3) I then run my test again. 4) stopProfiler 5) getSnapshot 1 voila One big caveat - I had to change the logic in : private static void redefine(Class[] clz, boolean instrument) to handle exception on a per class basis so that if loading a class fails we don't bail out of the whole operation: | if (clz != null) { | for (Class c : clz) { | try { | byte[] buffer = null; | if (instrument) { | buffer = transformer.loadInstrumented(c.getName(), c.getClassLoader()); | } else { | buffer = transformer.loadNonInstrumented(c.getName(), c.getClassLoader()); | } | | if (buffer != null) { | ClassDefinition cd = new ClassDefinition(c, buffer); | l.add(cd); | } | } | catch (Throwable t) { | System.err.println("Failed to load [" + c.getName() + "]: " + t.getMessage()); | } | } | } | Has anyone else had a similar experience or can shed some light on the issues? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4145160#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...