ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl instanceof URLClassLoader && !premainHasRun) {
premainHasRun = true;
System.setProperty(WeavingClassLoader.GLUE_NAME_KEY, PFProfilerMixin.class.getName());
URLClassLoader loader = (URLClassLoader) cl;
ClassLoader newCl = new WeavingClassLoader(loader.getURLs(), loader.getParent());
Thread.currentThread().setContextClassLoader(newCl);
}
}