program using hibernate does not terminate

Question

I created a program using Hibernate.

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

I wonder if it happens when Sessio

Answer 1

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.