gistfile1.txt

ExecutorService s = Executors.newFixedThreadPool(10);
Future<?> f = s.submit(
  new Runnable() {
    @Override
    public void run() {
      try {
        Context.enter();
        // do stuff
      } catch (Throwable e) {
      } finally {
	Context.exit();
      }
    }
  }
);

try {
  f.get(2, TimeUnit.SECONDS);
} catch (TimeoutException e) {
  f.cancel();
}