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java.lang.InterruptedException at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1219)
My beautifully simple Scheduler's code:
Why? Happens very rarely... Where should I be looking for the cause?
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The thread which called the schedule method gets interrupted. We don't have any information about where schedule gets called, or what might be happening in and to that thread, so it is impossible for us to say. If you aren't sure of the sequence then start peppering your code with tons of log statements so you can see exactly the flow and what happens at or around the thread being interrupted.
edit: And remember: the interrupt doesn't have to happen while the put() operation is in progress, it just has to happen some time before the operation and not be cleared (using the Thread#interrupted() method, for example).