25.25 java.lang.IllegalMonitorStateException (JDK 1.0)

Signals an illegal monitor state. It is thrown by the Object notify() and wait() methods used for thread synchronization.

public class IllegalMonitorStateException extends RuntimeException {
    // Public Constructors
            public IllegalMonitorStateException();
            public IllegalMonitorStateException(String s);
}

Hierarchy:

Object->Throwable(Serializable)->Exception->RuntimeException->IllegalMonitorStateException