I wrote this simple program to learn how to use Poison Pill pattern to terminate threads. It runs to completion but after all the threads are done processing, the application hangs for few minutes before exiting code 0.
I've included the jstack output at the end. I had originally written this program to use Thread and Runnable and it worked perfect, ie, without hanging for few minutes before exiting. Any help or hint is appreciated.
jstack output is
subject: ExecutorService is causing the program to hang for few minutes