How to deal with deadlock in Java thread pool?

Explanation

1. Deadlock refers to the congestion phenomenon caused by two or more processes competing for resources or communicating with each other during the implementation process. Without external force, it cannot advance.

Thread pool deadlock instance

2. Solution: Expand the thread pool and the threads or task results no longer depend on each other.

final ExecutorService executorService =
        Executors.newSingleThreadExecutor();
Future<Long> f1 = executorService.submit(new Callable<Long>() {
 
    public Long call() throws Exception {
        System.out.println("start f1");
        Thread.sleep(1000);//延时
        Future<Long> f2 =
           executorService.submit(new Callable<Long>() {
 
            public Long call() throws Exception {
                System.out.println("start f2");
                return -1L;
            }
        });
        System.out.println("result" + f2.get());
        System.out.println("end f1");
        return -1L;
    }
});

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