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rfkrocktk
 Post subject: Multiple updates in a session?
PostPosted: Fri Sep 26, 2008 2:02 pm 
Beginner
Beginner

Joined: Mon Jul 07, 2008 8:07 pm
Posts: 42
I'm using Spring 2.0.8 and Hibernate 3.3+, an AnnotatedSessionFactoryBean, MySQL 5, Firefox, Vista, and a keyboard.

I'm using the HibernateDaoSupport class as a base for my DAO objects. What I need to know is how to use more than one operation in a method. I need to fetch an object, perform some modification on it, then update it to the database. When I try doing this, I get this error:

Code:
org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
   at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410)
   at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:43)
   at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
   at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
   at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
   at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:223)
   at org.hibernate.event.def.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:33)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
   at org.hibernate.impl.SessionImpl.fireUpdate(SessionImpl.java:564)
   at org.hibernate.impl.SessionImpl.update(SessionImpl.java:552)
   at org.hibernate.impl.SessionImpl.update(SessionImpl.java:544)
   at com.tkassembled.database.UserDAOImpl.registerUser(UserDAOImpl.java:171)
   at com.tkassembled.service.HibernateServiceImpl.registerUser(HibernateServiceImpl.java:99)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)
   at $Proxy28.registerUser(Unknown Source)
   at com.tkassembled.RemotingHandler.registerUser(RemotingHandler.java:129)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.red5.server.service.ServiceInvoker.invoke(ServiceInvoker.java:217)
   at org.red5.server.service.ServiceInvoker.invoke(ServiceInvoker.java:123)
   at org.red5.server.net.rtmp.RTMPHandler.invokeCall(RTMPHandler.java:157)
   at org.red5.server.net.rtmp.RTMPHandler.onInvoke(RTMPHandler.java:409)
   at org.red5.server.net.rtmp.BaseRTMPHandler.messageReceived(BaseRTMPHandler.java:143)
   at org.red5.server.net.rtmp.RTMPMinaIoHandler.messageReceived(RTMPMinaIoHandler.java:119)
   at org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageReceived(AbstractIoFilterChain.java:570)
   at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)
   at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)
   at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)
   at org.apache.mina.filter.executor.ExecutorFilter.processEvent(ExecutorFilter.java:220)
   at org.apache.mina.filter.executor.ExecutorFilter$ProcessEventsRunnable.run(ExecutorFilter.java:264)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
   at java.lang.Thread.run(Thread.java:619)


My code kinda looks like this:

Code:
Criteria criteria = this.getSession.createCriteria(User.class);
criteria.add(Restrictions.eq("id", id));
User user = (User) criteria.uniqueResult();
if (!user.equals(null)) {
  user.setActive(true);
  this.getHibernateTemplate().update(user);
}
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phen0m
 Post subject:
PostPosted: Fri Sep 26, 2008 2:15 pm 
Beginner
Beginner

Joined: Wed Sep 24, 2008 5:44 pm
Posts: 34
Quote:
I'm using Spring 2.0.8 and Hibernate 3.3+, an AnnotatedSessionFactoryBean, MySQL 5, Firefox, Vista, and a keyboard.


I think your problem is that you're using Vista. And without a mouse!

But seriously. I'm not sure what getHibernateTemplate() does. Is it possible that it opens a new session? Does getSession.update(user); not work?

Also, if you're retrieving using a primary key you can use .get() or .load() instead of .uniqueResult()
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rfkrocktk
 Post subject:
PostPosted: Fri Sep 26, 2008 2:27 pm 
Beginner
Beginner

Joined: Mon Jul 07, 2008 8:07 pm
Posts: 42
I just found my mouse. It helps sometimes. I prefer to code in command prompt though, so it's not too much help all of the time... but Vista isn't too bad. It's an operating system, it has its ups and downs like any other. I'm just too lazy to fire up an Ubuntu machine even though I really want to check out linux.

getHibernateTemplate() returns a HibernateTemplate instance auto-loaded by Spring. It abstracts the use of sessions away from developers so all you gotta do is call this.getHibernateTemplate().persist(value) rather than create the session, start a transaction, click your heels three times...
Anyway, whenever I call getHibernateTemplate().* more than once in a method block, I get a weird error. I'm thinking that it only allows you to do one transaction with the hibernateTemplate object. I'm not sure. In my service layer, I can't start an update in any way, it's really weird.
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rfkrocktk
 Post subject:
PostPosted: Fri Sep 26, 2008 2:42 pm 
Beginner
Beginner

Joined: Mon Jul 07, 2008 8:07 pm
Posts: 42
Even if I explicitly call getSession().disconnect() and getSession().close() I'm still getting this error? Weird. Has anyone else dealt with this directly?
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rfkrocktk
 Post subject:
PostPosted: Fri Sep 26, 2008 3:47 pm 
Beginner
Beginner

Joined: Mon Jul 07, 2008 8:07 pm
Posts: 42
Everything I know is wrong.

getHibernateTemplate() seems to be opening up a new Session every time I call it, so I had to workaround by using the actual Sessions and Transactions.

phen0m, thanks for helping me process my insanity.
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