EC
InterruptedException
JavaWARNINGNotableConcurrency

Thread interrupted while blocked

Quick Answer

Always restore the interrupt flag with Thread.currentThread().interrupt() after catching InterruptedException.

What this means

Thrown when a thread is waiting, sleeping, or blocked and another thread interrupts it via Thread.interrupt().

Why it happens
  1. 1Thread.sleep() interrupted by shutdown signal
  2. 2ExecutorService.shutdownNow() interrupts running tasks

Fix

Restore interrupt flag

Restore interrupt flag
try {
    Thread.sleep(1000);
} catch (InterruptedException e) {
    Thread.currentThread().interrupt(); // restore
    return;
}

Why this works

Restoring the flag allows calling code to detect interruption and clean up.

Code examples
Bad — swallow interruptjava
try { Thread.sleep(1000); }
catch (InterruptedException e) { /* never do this */ }
Good — restore and returnjava
try { Thread.sleep(1000); }
catch (InterruptedException e) {
    Thread.currentThread().interrupt();
    return;
}
Re-throw as uncheckedjava
try { future.get(); }
catch (InterruptedException e) {
    Thread.currentThread().interrupt();
    throw new RuntimeException(e);
}
Sources
Official documentation ↗

Java SE Documentation

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