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Hello All,
I have just started working with a Spring based architecture. I am in the process of integrating Hibernate into the system. The system is based on POJOs. Each POJO has associated DAO and Validator helper objects that are not mapped to tables in the database. These objects are injected to the POJO using a spring factory. Calls to delete and update on the POJO are then delegated to the associated DAO.

All well and good. However, I would like to start using Hibernate in in my data access layer. I want to use Hibernate to do a lookup but induce it to use Springs dependency injection. At the moment I can use Hibernate to do a lookup but it does not populate the helper objects so the DAO will be null and I have no way of persisting any changes made.
I would be really grateful of any suggestions.
Many Thanks,

Ben

Ask on the Spring forum.

Ok so this is how far I have got.
I am using the domain factory that wraps the spring application context. the create call injects the helper class dependencies.
I am assuming that by setting the instance to load on the event hibernate will populate the properties using its own ORM. Is this correct?

public class HibernateLoadListener extends DefaultLoadEventListener {

public Object onLoad(LoadEvent event,LoadEventListener.LoadType loadType)
throws HibernateException{
DomainObject obj ;
//perform dependency injection here
Class classToMake;
try{
classToMake = Class.forName(event.getEntityClassName());

obj = DomainFactory.getInstance().create(classToMake);

obj.setId((DomainObjectID)event.getEntityId());

event.setInstanceToLoad(obj);

}
catch(ClassNotFoundException ex){
throw new HibernateException(ex);
}

obj =(DomainObject ) super.onLoad(event, loadType);

return obj;
}

}

anyway I get the following error when I atempt this. Should I be using a pre load listener? I should point out there is no error if i dont use event set instance

[07/07/05 11:38:41:828 GMT] 4e3c4e3c DefaultLoadEv I org.hibernate.event.def.DefaultLoadEventListener TRAS0014I: The following exception was logged org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.du.ezmarket.business.parallelnegotiation.AuctionLineImpl#com.du.ezmarket.business.DomainObjectID@494a494a[id=10201]]
at java.lang.Throwable.<init>(Throwable.java)
at java.lang.Throwable.<init>(Throwable.java)
at org.hibernate.exception.NestableRuntimeException.<init>(NestableRuntimeException.java:100)
at org.hibernate.NonUniqueObjectException.<init>(NonUniqueObjectException.java:22)
at org.hibernate.NonUniqueObjectException.<init>(NonUniqueObjectException.java:28)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:171)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:210)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:123)
at com.du.ezmarket.integration.marketbasket.HibernateLoadListener.onLoad(HibernateLoadListener.java)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:599)
at org.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:73)
at org.hibernate.type.EntityType.resolve(EntityType.java:264)
at org.hibernate.type.EntityType.nullSafeGet(EntityType.java:196)
at org.hibernate.persister.collection.AbstractCollectionPersister.readElement(AbstractCollectionPersister.java:617)
at org.hibernate.collection.PersistentSet.readFrom(PersistentSet.java:226)
at org.hibernate.loader.Loader.readCollectionElement(Loader.java:610)
at org.hibernate.loader.Loader.readCollectionElements(Loader.java:347)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:302)
at org.hibernate.loader.Loader.doQuery(Loader.java:387)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:206)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1360)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:105)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1353)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:170)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:47)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:133)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getLineDTOs(AuctionSummaryDTOBuilder.java:183)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getBasketDTOs(AuctionSummaryDTOBuilder.java:130)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getBasketSummaryDTO(AuctionSummaryDTOBuilder.java:83)
at com.du.ezmarket.reverseauction.controllercommands.AuctionSummaryRedirectorCmdImpl.performExecute(AuctionSummaryRedirectorCmdImpl.java:83)
at com.ibm.commerce.command.ECCommandTarget.executeCommand(ECCommandTarget.java:132)
at com.ibm.ws.cache.command.CommandCache.executeCommand(CommandCache.java:282)
at com.ibm.websphere.command.CacheableCommandImpl.execute(CacheableCommandImpl.java:161)
at com.ibm.commerce.command.AbstractECTargetableCommand.execute(AbstractECTargetableCommand.java:175)
at com.ibm.commerce.webcontroller.ControllerCmdExecUnit.execute(ControllerCmdExecUnit.java:193)
at com.ibm.commerce.webcontroller.WebController.executeTransaction(WebController.java:222)
at com.ibm.commerce.webcontroller.WebController.processRequest(WebController.java:877)
at com.ibm.commerce.adapter.AbstractHttpAdapter.processRequest(AbstractHttpAdapter.java:330)
at com.ibm.commerce.server.RequestServlet$2.run(RequestServlet.java:1504)
at com.ibm.commerce.server.RequestServlet.service(RequestServlet.java:1574)
at com.du.ezmarket.reverseauction.servlets.EZMRequestServlet.service(EZMRequestServlet.java:85)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:76)
at com.ibm.commerce.dynacache.filter.CacheFilter$1.run(CacheFilter.java:359)
at com.ibm.commerce.dynacache.filter.CacheFilter.doFilter(CacheFilter.java:396)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:939)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:530)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:176)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:201)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:610)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:435)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java)
.
org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.du.ezmarket.business.parallelnegotiation.AuctionLineImpl#com.du.ezmarket.business.DomainObjectID@494a494a[id=10201]]
at java.lang.Throwable.<init>(Throwable.java)
at java.lang.Throwable.<init>(Throwable.java)
at org.hibernate.exception.NestableRuntimeException.<init>(NestableRuntimeException.java:100)
at org.hibernate.NonUniqueObjectException.<init>(NonUniqueObjectException.java:22)
at org.hibernate.NonUniqueObjectException.<init>(NonUniqueObjectException.java:28)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:171)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:210)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:123)
at com.du.ezmarket.integration.marketbasket.HibernateLoadListener.onLoad(HibernateLoadListener.java)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:599)
at org.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:73)
at org.hibernate.type.EntityType.resolve(EntityType.java:264)
at org.hibernate.type.EntityType.nullSafeGet(EntityType.java:196)
at org.hibernate.persister.collection.AbstractCollectionPersister.readElement(AbstractCollectionPersister.java:617)
at org.hibernate.collection.PersistentSet.readFrom(PersistentSet.java:226)
at org.hibernate.loader.Loader.readCollectionElement(Loader.java:610)
at org.hibernate.loader.Loader.readCollectionElements(Loader.java:347)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:302)
at org.hibernate.loader.Loader.doQuery(Loader.java:387)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:206)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1360)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:105)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1353)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:170)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:47)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:133)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getLineDTOs(AuctionSummaryDTOBuilder.java:183)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getBasketDTOs(AuctionSummaryDTOBuilder.java:130)
at com.du.ezmarket.business.transport.marketbasket.AuctionSummaryDTOBuilder.getBasketSummaryDTO(AuctionSummaryDTOBuilder.java:83)
at com.du.ezmarket.reverseauction.controllercommands.AuctionSummaryRedirectorCmdImpl.performExecute(AuctionSummaryRedirectorCmdImpl.java:83)
at com.ibm.commerce.command.ECCommandTarget.executeCommand(ECCommandTarget.java:132)
at com.ibm.ws.cache.command.CommandCache.executeCommand(CommandCache.java:282)
at com.ibm.websphere.command.CacheableCommandImpl.execute(CacheableCommandImpl.java:161)
at com.ibm.commerce.command.AbstractECTargetableCommand.execute(AbstractECTargetableCommand.java:175)
at com.ibm.commerce.webcontroller.ControllerCmdExecUnit.execute(ControllerCmdExecUnit.java:193)
at com.ibm.commerce.webcontroller.WebController.executeTransaction(WebController.java:222)
at com.ibm.commerce.webcontroller.WebController.processRequest(WebController.java:877)
at com.ibm.commerce.adapter.AbstractHttpAdapter.processRequest(AbstractHttpAdapter.java:330)
at com.ibm.commerce.server.RequestServlet$2.run(RequestServlet.java:1504)
at com.ibm.commerce.server.RequestServlet.service(RequestServlet.java:1574)
at com.du.ezmarket.reverseauction.servlets.EZMRequestServlet.service(EZMRequestServlet.java:85)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:76)
at com.ibm.commerce.dynacache.filter.CacheFilter$1.run(CacheFilter.java:359)
at com.ibm.commerce.dynacache.filter.CacheFilter.doFilter(CacheFilter.java:396)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:939)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:530)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:176)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:201)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:610)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:435)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java)


I configure the listener:
<listener type="load" class="com.du.ezmarket.integration.marketbasket.HibernateLoadListener"/>

What part of "this has nothing to do with Hibernate and you are in the wrong place" wasn't understandable?

Hello,

I am sorry that you seem so annoyed. I am actually tracing through the hibernate source code and have found something I think maybe an issue. I really aprrecaite the help I have had so far and think hibernate is a great product. Anyway, I am sorry you feel that way. I shall post it for general interest.

I am really very puzzled by your attitude,

Ben

Anyway, I found this:

/**
* Perfoms the load of an entity.
*
* @return The loaded entity.
* @throws HibernateException
*/
protected Object load(
final LoadEvent event,
final EntityPersister persister,
final EntityKey keyToLoad,
final LoadEventListener.LoadType options)
throws HibernateException {

if ( event.getInstanceToLoad() != null ) {
if ( event.getSession().getPersistenceContext().getEntry( event.getInstanceToLoad() ) != null ) {
throw new PersistentObjectException(
"attempted to load into an instance that was already associated with the session: " +
MessageHelper.infoString( persister, event.getEntityId(), event.getSession().getFactory() )
);
}
persister.setIdentifier( event.getInstanceToLoad(), event.getEntityId(), event.getSession().getEntityMode() );
}

Object entity = doLoad(event, persister, keyToLoad, options);

boolean isOptionalInstance = event.getInstanceToLoad() != null;

if ( !options.isAllowNulls() || isOptionalInstance ) {
ObjectNotFoundException.throwIfNull( entity, event.getEntityId(), event.getEntityClassName() );
}

if ( isOptionalInstance && entity != event.getInstanceToLoad() ) {
throw new NonUniqueObjectException( event.getEntityId(), event.getEntityClassName() );
}

return entity;
}

It does a compare on reference and not id. Which screws up my code which places a new reference in.

Oh and by the way Christian.
This has nothing to do with Spring. It could be any application context framework. So in simple English for you to understand:

How do I capture the the onLoad process for a POJO and successfully inject a new entity reference .

I am beginning to wonder if you have any understanding of Hibernate at all. It would seem by your previous posts,to me and others, that all you are capable of is criticising and demeaning other peoples efforts in rather poor English.

[quote="christian"]What part of "this has nothing to do with Hibernate and you are in the wrong place" wasn't understandable?[/quote]

ok, i read these forums a lot and have solved a lot of my problems via other peoples posts so havent had a need to register. However, this fun forum posting made me register just to comment. Someone who is obviously keen on hibernate, enjoying working with it and getting an exception in hibernate when trying to integrate it with spring (fairly common I would think) posts for help on here and a member of the hibernate team comes back with the above helpful statement.

Fine you think its spring specific, the original poster doesnt and considering his error is in hibernate this seems a reasonable place to see if anyone else is getting a hibernate error.

tbh christian, if you have nothing valuable to add to a posting (which looking at other forum posts seems to be a common approach to your posting) dont bother answering.

ben - i had a similar problem. i'll dig up my solution.

[quote="christian"]What part of "this has nothing to do with Hibernate and you are in the wrong place" wasn't understandable?[/quote]

ok, i read these forums a lot and have solved a lot of my problems via other peoples posts so havent had a need to register. However, this fun forum posting made me register just to comment. Someone who is obviously keen on hibernate, enjoying working with it and getting an exception in hibernate when trying to integrate it with spring (fairly common I would think) posts for help on here and a member of the hibernate team comes back with the above helpful statement.

Fine you think its spring specific, the original poster doesnt and considering his error is in hibernate this seems a reasonable place to see if anyone else is getting a hibernate error.

tbh christian, if you have nothing valuable to add to a posting (which looking at other forum posts seems to be a common approach to your posting) dont bother answering.

ben - i had a similar problem. i'll dig up my solution.

double post - soz.

Ok, I'm out of this forum now, finally. You'll soon see how much fun it is without me deleting the crap.

Does that mean you got fired? Or do you just have a new "aspect-oriented" personality view?