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Java puzzle System.exit and locks

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Java puzzle System.exit and locks

· Java Zone ·
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How do you break a Monolith into Microservices at Scale? This ebook shows strategies and techniques for building scalable and resilient microservices.

When you call System.exit() it will stop the execution of the thread at that point and not call any finally blocks.
private static final Object lock = new Object();

public static void main(String... args) {
    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        @Override
        public void run() {
            System.out.println("Locking");
            synchronized (lock) {
                System.out.println("Locked");
            }
        }
    }));
    synchronized (lock) {
        System.exit(0);
    }
}
What does this program print?

Replace System.exit(0) with Thread.currentThread().stop() and run again for comparison.

 

From http://vanillajava.blogspot.com/2011/12/java-puzzle-systemexit-and-locks.html

How do you break a Monolith into Microservices at Scale? This ebook shows strategies and techniques for building scalable and resilient microservices.

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