The IllegalMonitorStateException
is an exception that occurs when a thread tries to perform an operation on an object’s monitor that
it does not own. This exception is typically thrown when a method like wait()
, notify()
, or notifyAll()
is
called outside a synchronized block or method.
IllegalMonitorStateException
is specifically designed to be an unchecked exception to point out a programming mistake. This exception
serves as a reminder for developers to rectify their code by correctly acquiring and releasing locks using synchronized blocks or methods. It also
emphasizes the importance of calling monitor-related methods on the appropriate objects to ensure proper synchronization.
Catching and handling this exception can mask underlying synchronization issues and lead to unpredictable behavior.
public void doSomething() { try { anObject.notify(); } catch(IllegalMonitorStateException e) { // Noncompliant } }
public void doSomething() { synchronized(anObject) { anObject.notify(); } }