This is probably a programming error, and some variant of the signal() or signalAll() method was intended instead, otherwise IllegalMonitorStateException may occur.

Example:

  class C {
    final Lock l = new ReentrantLock();
    final Condition c = l.newCondition();

    void release() {
      l.lock();
      try {
        c.notifyAll(); // probably 'signalAll()' was intended here
      } finally {
        l.unlock();
      }
    }
  }