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Editorial Team
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Asked: 2026-05-15T00:53:45+00:00

I have a piece of code (simplified): if(reentrantLockObject.isLocked()) { reentrantLockObject.unlock(); } where reentrantLockObject is

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I have a piece of code (simplified):

if(reentrantLockObject.isLocked()) {
       reentrantLockObject.unlock();
}

where reentrantLockObject is java.util.concurrent.locks.ReentrantLock.
Sometimes I get IllegalMonitorStateException.
It seams that lock was released between check and unlock() call.
How can I prevent this exception?

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1 Answer

  1. Editorial Team

    isLocked returns whether any thread holds the lock. I think you want isHeldByCurrentThread:

    if (reentrantLockObject.isHeldByCurrentThread()) {
    reentrantLockObject.unlock();
}

    Having said that, isHeldByCurrentThread is documented to be mainly for diagnostic purposes – it would be unusual for this piece of code to be the right approach. Can you explain why you think you need it?

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