try {
      Policy.setPolicy(new PermissivePolicy());
      System.setSecurityManager(new SecurityManager());
      WeakReference<ClassLoader> loaderRef = doTestUnloadableInStaticFieldIfClosed();
      GcFinalization.awaitClear(loaderRef);
    } finally {
      System.setSecurityManager(oldSecurityManager);
      Policy.setPolicy(oldPolicy);
    }
  }