gistfile1.java

public class Deadlock {
    public static void main(String[] args) {
        final Integer mutex1 = 1;
        final Integer mutex2 = 2;
        new Thread(new DeadlockRunnable(mutex1, mutex2)).start();
        new Thread(new DeadlockRunnable(mutex2, mutex1)).start();
    }

    static class DeadlockRunnable implements Runnable {
        private final Integer first;
        private final Integer second;

        DeadlockRunnable(Integer first, Integer second) {
            this.first = first;
            this.second = second;
        }

        @Override
        public void run() {
            synchronized (first) {
                try {
                    Thread.sleep(100); // wait a bit to allow other thread catch on a mutex
                } catch (InterruptedException e) {
                    // ignore
                }
                synchronized (second) {
                    System.out.println("I'm not locked!");
                }
            }
        }
    }
}