Shutting down an ExecutorService after uncaught exception thrown from supplied Runnable

doStuffAndScheduleShutdown()

Notice the ScheduledExecutorService has stopped as soon as condition counter >= 4 was satisfied and an exception thrown. The proper shutdown is issued at ~9000 millis.

main() from thread=main
End of doStuffAndScheduleShutdown() at millis: 52

do stuff in thread: named-thread-0
do stuff in thread: named-thread-0
do stuff in thread: named-thread-0
do stuff in thread: named-thread-0
Shutting down from thread: named-thread-0 at millis: 9053

shutdownThroughFuture()

Notice future.get() is blocking -> End of shutdownThroughFuture() appears last. If the Runnable would proceed without an issue, we would block the outer thread indefinitely.

main() from thread=main
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
Caught exception: java.lang.NullPointerException
Shutting down due to EXCEPTION thread(Thread-0) description: shutting down singleThreadScheduledExecutor at millis: 3156
End of shutdownThroughFuture()

shutdownThroughFutureAsync()

Here we run a recurring checking (future.get()) logic inside of a separate Thread managed by the ScheduledExecutorService.

main() from thread=main
End of shutdownThroughFutureAsync()

do stuff in thread=named-thread-0
Before future.get() in shutdownThroughFutureAsync()
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
Caught exception: java.lang.NullPointerException
Shutting down due to EXCEPTION thread(named-thread-1) description: shutting down singleThreadScheduledExecutor at millis: 3159
Shutting down due to EXCEPTION thread(named-thread-1) description: shutting down scheduledThreadPool at millis: 3159

shutdownThroughRunnable()

This version passes an instance of ExecutorService to the Runnable object. Runnable handles the shutdown.

main() from thread=main
End of shutdownThroughRunnable()

do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
do stuff in thread=named-thread-0
Shutting down due to EXCEPTION thread(named-thread-0) description: counter>=4 at millis: 3159