issue with executor thread pool : executer service not getting shutdown

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In my java program I am using cocurrnent execution of threads by using code below

Java

ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 5; i++) {
    Thread t1 = new AMDataSend(Q_AM_TO_ID, DATA, MAILER_ID, AM_BATCH_ID, FILE_NAME);
    System.out.println(" thread : " + i);
    executor.execute(t1);
}
executor.shutdown();
System.out.println("pre !executor.isTerminated() : "+(!executor.isTerminated()));
while (!executor.isTerminated()) {

    System.out.println("!executor.isTerminated() : "+(!executor.isTerminated()));
    boolean awaitTermination = executor.awaitTermination(1000, TimeUnit.MILLISECONDS);
    if(awaitTermination){
        break;
    }else{
        System.out.println("not terminated");
    }
}
System.out.println("Finished all threads");

but the executor not get shutdown and while loop act as infinite. How can I solve this problem?

Posted 1-Jul-13 19:59pm

gavkk

Updated 1-Jul-13 20:08pm

v3

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Shubhashish_Mandal 2-Jul-13 2:53am

May child task still active. Shutdown() is wait until any active task is exist in the pool.
Once there are no active task it will showdown. So it is seems to me that there are still some active task exist.
But if you want to shut-down the pool immediately then call shutdownNow() ;

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Prasad Khandekar · Answer 1 · 2013-07-01T20:49:00

Hello,

Check your AMDataSend class. Probably it's waiting for something or has an infinite loop inside. You can modify your termination check loop as follows to forecefully terminate the worker threads.