Re: FutureTask.cancel() - can anyone explain the mechanism?

Piotr Kobzda <>
Thu, 17 Sep 2009 19:48:55 +0200
The Dude wrote:

         public Integer call() {

            try {

                while(true) {
                    final String message = this.blockingQueue.take();
            catch (Throwable t) {
                System.out.println("Throwable caught in call() " + t.getCause

The problem seems to be here (also in your other exception handlers).
Instead of the above try:

     System.out.println("Throwable caught in call() " + t);

            finally {
                System.out.println("Entered call() finally block.");

            return new Integer((int)0);

    public static void main(String[] args) {

        final ExecutorService executor = Executors.newSingleThreadExecutor

        final MyCallable myCallable = new MyCallable();

        final Future<?> myFuture = executor.submit(myCallable);

        myCallable.put("Go Southend United FC!");


This may cause no execution of your callable at all. Some delay is
needed before cancel.


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