1. 将所有的程序关闭挂钩移除：

Field field = Shutdown.class.getDeclaredField("hooks");
field.setAccessible(true);
HashSet hooks = (HashSet) field.get(null);
for (Iterator it = hooks.iterator(); it.hasNext(); ) {
    Thread hook = it.next();
    Runtime.getRuntime().removeShutdownHook(hook);
    it.remove();
}

2. 将需要执行的任务包装成一个只包含弱引用的对象，并注册到ShutdownHook中：

public class WeakRunnable implements Runnable {
    WeakReference weakRef;

    public WeakRunnable(Runnable runnable) {
        weakRef = new WeakReference<>(runnable);
    }

    @Override
    public void run() {
        Runnable runnable = weakRef.get();
        if (runnable != null) {
            runnable.run();
        }
    }
}

在代码中注册ShutdownHook时，可以使用该对象进行包装：

Runtime.getRuntime().addShutdownHook(new Thread(new WeakRunnable(() -> {
    // Your code here
})));