private static Set<String> findStandardMBeansFromJar(URL codeBase) throws Exception { InputStream is = codeBase.openStream(); JarInputStream jis = new JarInputStream(is); Set<String> names = new TreeSet<String>(); JarEntry entry; while ((entry = jis.getNextJarEntry()) != null) { String name = entry.getName(); if (!name.endsWith(".class")) continue; name = name.substring(0, name.length() - 6); name = name.replace('/', '.'); names.add(name); } return names; }