My program is not returning/ending with Executor

java future
java executors
executor services
callable vs runnable
java future callback

Given the following Java example, which uses multithreading:

 import java.util.concurrent.*;

 public class SquareCalculator {
     private ExecutorService executor = Executors.newSingleThreadExecutor();

     public Future<Integer> calculate(Integer input) {
         return executor.submit( () -> {
             return input * input;

     public static void main(String[] args) {
         try {
             Future<Integer> future = new SquareCalculator().calculate(10);
             while (!future.isDone()){

             Integer result = future.get();
             System.out.println("we got: " + result);
         } catch(InterruptedException | ExecutionException e) {
             System.out.println("had exception");

It produces:

java SquareCalculator
we got: 100

But the application is never terminating.

Am I suppose to join the thread or something?

You need to shut down the executor framework towards the end of the program and wait until it gracefully terminates..

try {
    executor.awaitTermination(4 * 3600, TimeUnit.SECONDS);
} catch (Exception e) {

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Should be in comment but not enough reputation.

You should call shutdown on executor. You can get more details from below link: Reason for calling shutdown() on ExecutorService

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I bet you want to add something like this:

   finally {
        if (executor != null) {

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Concurrency in Java: The Executor Framework, Unlike the fixed thread pool, the number of threads of this executor pool is not bounded. the task with fixed interval, irrespective of when the previous task ended. to the executor, like above, is asynchronous i.e. the program execution does not If the task is complete the result is immediately returned to the caller or else  If the tenant had a month-to-month lease agreement, notice of the tenant's death acts as the end of the lease, and the executor's responsibility ends 30 days after the tenant last paid rent.

Java Callable and Future Tutorial, What if you want to return a result from your tasks? Well, Java Just like Runnable , you can submit a Callable to an executor service for execution. isDone()) { System.out.println("Task is still not done. In the above program, the first call to future.get() statement blocks until all the futures are complete. -- Set the return code to 0. SET @Return = 0 END. GO. After the script runs, the db_executor role will have permission to execute. every stored procedure in the database. That means any user I

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