doPrivileged block doesn't totally work in ProxyClassLoaderCache

    private ClassLoader createProxyClassLoader(Class<?> proxyInterface) {
       ....
        for (Class<?> currentInterface : PROXY_INTERFACES.get()) {
            ret.addLoader(getClassLoader(currentInterface));
            LOG.log(Level.FINE, "interface for new created ProxyClassLoader is "
                + currentInterface.getName());
            LOG.log(Level.FINE, "interface's classloader for new created ProxyClassLoader is "
                + currentInterface.getClassLoader());
        }
        return ret;
    }