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Editorial Team
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Asked: 2026-05-25T01:48:36+00:00

In the below If exception happens at syncMethod2() then how can i unlock the

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In the below If exception happens at syncMethod2() then how can i unlock the lock object? 

public class ReEntrantLock {
ReentrantLock lock = new ReentrantLock();

void syncMethod1() {
  lock.lock();
  syncMethod2(); // throw new NullPointerException();
  lock.unlock();
}

}
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1 Answer

  1. Editorial Team

    You use try–finally:

    lock.lock();
try {
    syncMethod2(); // throw new NullPointerException();
} finally {
    lock.unlock();
}

    That pattern is also described in the ReentrantLock JavaDoc.

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