What are the possible reason for a java.util.concurrent.RejectedExecutionException in a SingleThreadExecutor

Question

I create the following executor in a singleton:

   final private ExecutorService executor = Executors.newSingleThreadExecutor(new ThreadFactory() {
                 


        

Answer 1

You might have submitted tasks after calling executor.shutdown(). Normally to stop executor they do

    executor.shutdown();
    executor.awaitTermination(10, TimeUnit.MINUTES);