public class Example1 {
    MyDao dao;
    ...
    public void doWork() {
        MyEntity entity = dao.getEntity();
        Runnable job = new Job(entity);
        Thread t = new Thread(job);
        t.run();
        t.join();
        dao.merge(entity);
    }
 
}

我的第二个问题是：在一个线程中新建一个实体并将其保存在另一个线程中是否安全？

public class Example2 {
    MyDao dao;
    ...
    public void doWork() {
        MyEntity entity = new Entity();
        new Thread(new Job(dao,entity)).run();
    }
}
 
public class Job implements Runnable {
    private MyDao dao;
    private MyEntity entity;
    ...
    @Override
    public void run() {
        dao.save(entity);
    }
}

编辑我忘记提到这些实体是专门配置为急切加载