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program using hibernate does not terminate

I created a program using Hibernate.

The program reaches the main function end, nevertheless the program is running.

I wonder if it happens when SessionFactory is configured using Hibernate Version 4.x.

Is the way to configure wrong?


manual1_1_first_hibernate_apps.java

public static void main(String[] args) {

    args[0] ="list";
    if (args.length <= 0) {
        System.err.println("argement was not given");
        return;
    }

    manual1_1_first_hibernate_apps mgr = new manual1_1_first_hibernate_apps();

    if (args[0].equals("store")) {
        mgr.createAndStoreEvent("My Event", new Date());
    }
    else if (args[0].equals("list")) {
        mgr.<Event>listEvents().stream()
            .map(e -> "Event: " + e.getTitle() + " Time: " + e.getDate())
            .forEach(System.out::println);
    }
    Util.getSessionFactory().close();
}

private <T> List<T> listEvents() {
    Session session = Util.getSessionFactory().getCurrentSession();
    session.beginTransaction();
    List<T> events = Util.autoCast(session.createQuery("from Event").list());
    session.getTransaction().commit();
    return events;
}

Util.java

private static final SessionFactory sessionFactory;

/**
 * build a SessionFactory
 */
static {
    try {
        // Create the SessionFactory from hibernate.cfg.xml

        // hibernate version lower than 4.x are as follows
        // # it successful termination. but buildSessionFactory method is deprecated.
        // sessionFactory = new Configuration().configure().buildSessionFactory();

        // version 4.3 and later
        // # it does not terminate. I manually terminated.
        Configuration configuration = new Configuration().configure();
        StandardServiceRegistry serviceRegistry = 
                new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    }
    catch (Throwable ex) {
        // Make sure you log the exception, as it might be swallowed
        System.err.println("Initial SessionFactory creation failed." + ex);
        throw new ExceptionInInitializerError(ex);
    }
}

/**
 * @return built SessionFactory
 */
public static SessionFactory getSessionFactory() {
    return sessionFactory;
}

The following console log snippets when program terminate and use buildSessionFactory method.

2 08, 2014 8:42:25 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH000030: Cleaning up connection pool [jdbc:derby:D:Javajdk1.7.0_03(x86)dbbintestdb]

but if do not use deprecated buildSessionFactory method and terminated(program is running), the above two lines do not appear.

ENVIRONMENT:

 Hibernate 4.3.1
 DERBY
 JRE 1.8
 IntelliJ IDEA 13

Answer

maybe, I solved this problem.

I saw the thread dump after Util.getSessionFactory().close() called, a thread named “pool-2-thread-1” state was TIMED_WAITING (parking).

The following snippets dump

Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.0-b69 mixed mode):

"DestroyJavaVM" #16 prio=5 os_prio=0 tid=0x00000000020b9000 nid=0x3684 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"pool-2-thread-1" #15 prio=5 os_prio=0 tid=0x000000001bc27000 nid=0x3f0 waiting on condition [0x000000001ce6f000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x0000000080be30a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)

"derby.rawStoreDaemon" #14 daemon prio=5 os_prio=0 tid=0x000000001b059000 nid=0xa3c in Object.wait() [0x000000001ba1f000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000000805f6190> (a org.apache.derby.impl.services.daemon.BasicDaemon)
    at org.apache.derby.impl.services.daemon.BasicDaemon.rest(Unknown Source)
    - locked <0x00000000805f6190> (a org.apache.derby.impl.services.daemon.BasicDaemon)
    at org.apache.derby.impl.services.daemon.BasicDaemon.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:744)

"Timer-0" #13 daemon prio=5 os_prio=0 tid=0x000000001b08e800 nid=0x2160 in Object.wait() [0x000000001b6af000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000080608118> (a java.util.TaskQueue)
    at java.lang.Object.wait(Object.java:502)
    at java.util.TimerThread.mainLoop(Timer.java:526)
    - locked <0x0000000080608118> (a java.util.TaskQueue)
    at java.util.TimerThread.run(Timer.java:505)

I thought the cause is thread named “pool-2-thread-1” that created by buildSessionFactory method.

As a result of comparing the two buildSessionFactory method, I noticed that ServiceRegistry resources has not released.

Program successfully terminated by releasing it.

The following code, I adding.

Util.java

configuration.setSessionFactoryObserver(
        new SessionFactoryObserver() {
            @Override
            public void sessionFactoryCreated(SessionFactory factory) {}
            @Override
            public void sessionFactoryClosed(SessionFactory factory) {
                ((StandardServiceRegistryImpl) serviceRegistry).destroy();
            }
        }
);

thanks.