VM.enableGC();
  static ClassLoader currentClassLoader() {      VM_StackBrowser b = new VM_StackBrowser();      VM.disableGC();      b.init();      while(b.hasMoreFrames() && b.getClassLoader() == VM_SystemClassLoader.getVMClassLoader())	  b.up();      return b.hasMoreFrames()? b.getClassLoader(): null;  }