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mpsantos
 Post subject: Saving and Entity that was removed (EntityNotFoundException)
PostPosted: Mon Jul 02, 2007 10:23 am 
Beginner
Beginner

Joined: Thu Feb 22, 2007 6:08 am
Posts: 35
Hi there!

Im developing a backend with an Applet as a frontend. And i am with a problem persisting a entity.

When an entity is created (new operator, that create a entity with out id, and properties are setted) on the client side, it is passed to to the servlet where it is persisted with the following code:
Code:
ReturnObject returnObject = new ReturnObject();
EntityManagerFactory emf = HibernateUtil.getEntityManagerFactory();
EntityManager em = emf.createEntityManager();
EntityTransaction transaction = em.getTransaction();
try{
     transaction.begin();
     //check if mandatory field are filled
     returnObject.addReturnObject(checkImovelFields(imovel));
           
     if(returnObject.hasErrors()){
        transaction.rollback();
     } else {   
        em.merge(imovel);
        returnObject.addInfoMessage(IConstants.MSG_INFO_SUCESS_ON_CREATION);
         transaction.commit();
    }
} catch(Exception e){
    e.printStackTrace();
    String exceptionCause = getExceptionCause(e);
           
    returnObject.addErrorMessage(exceptionCause);
    transaction.rollback();
} finally {
     em.close();
     return returnObject;
}


When a user edit a entity, to control concorrent acess, on the servlet on update time, i compare the initial state ot the entity on the client side with the entity on the DB side to check if the entity was change by another user. If so, the user get a message saying that the entity was changed, and if he want to override the information. Till here everything runs allrigth.

My problem is if im editing an entity and, the entity is removed by another user. The remove code is following:

Code:
ReturnObject returnObject = new ReturnObject();
EntityManagerFactory emf = HibernateUtil.getEntityManagerFactory();
EntityManager em = emf.createEntityManager();
EntityTransaction transaction = em.getTransaction();
       
try{
    transaction.begin();
    ImovelHabitacional imovelToRemove = em.find(ImovelHabitacional.class, imovelHabitacionalId);
    em.remove(imovelToRemove);
    transaction.commit();
} catch(Exception e){
    transaction.rollback();
           
    e.printStackTrace();
    String exceptionCause = getExceptionCause(e);
    returnObject.addErrorMessage(exceptionCause);
           
} finally {
    em.close();
    return returnObject;
}


The servlet detects that that entity no longer exists on the DB, and so the user get's a message saying that entity no longer exist, and if he want to save any way that entity. If the answer is "YES" then on the client side i create a new instance of the entity just like the normal creation, that works fine, copy the properties values to this new entity (to simulate a creation) and send it to the servlet to the creation method.

Some how, the entity manager still thinks that entity still exists and raise the follow exception: (the ImovelHabitacional is the entity that i am dealing with)

Full stack trace of any exception that occurs:
Code:
avax.persistence.EntityNotFoundException: Unable to find immo.persistence.ImovelHabitacional with id 1
        at org.hibernate.ejb.Ejb3Configuration$Ejb3EntityNotFoundDelegate.handleEntityNotFound(Ejb3Configuration.java :107)
        at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:145)
        at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:195)
        at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103)
        at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
        at org.hibernate.impl.SessionImpl.internalLoad (SessionImpl.java:846)
        at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:557)
        at org.hibernate.type.EntityType.resolve(EntityType.java:379)
        at org.hibernate.type.EntityType.replace (EntityType.java:259)
        at org.hibernate.type.AbstractType.replace(AbstractType.java:153)
        at org.hibernate.type.TypeFactory.replace(TypeFactory.java:495)
        at org.hibernate.event.def.DefaultMergeEventListener.copyValues (DefaultMergeEventListener.java:377)
        at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:179)
        at org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached (DefaultMergeEventListener.java:240)
        at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:120)
        at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:687)
        at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:669)
        at org.hibernate.engine.CascadingAction$6.cascade(CascadingAction.java:245)
        at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java :268)
        at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
        at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
        at org.hibernate.engine.Cascade.cascadeCollectionElements (Cascade.java:296)
        at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
        at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
        at org.hibernate.engine.Cascade.cascadeProperty (Cascade.java:169)
        at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
        at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:456)
        at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient (DefaultMergeEventListener.java:194)
        at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:123)
        at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java :53)
        at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
        at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
        at org.hibernate.impl.SessionImpl.merge(SessionImpl.java :665)
        at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:227)
        at immo.servlets.ImovelHabitacionalServlet.createImovelHabitacional(ImovelHabitacionalServlet.java:161)
        at immo.servlets.ImovelHabitacionalServlet.doPost(ImovelHabitacionalServlet.java:81)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        at javax.servlet.http.HttpServlet.service( HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java :173)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket (PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java :684)
        at java.lang.Thread.run(Thread.java:619)



Any one know what am i doing wrong or what am i forgeting to do?

thanx a lot

Hibernate version:
Hibernate Core 3.2.2 GA
Hibernate EntityManager 3.2.1 GA

Name and version of the database you are using:
Mysql 5
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mpsantos
 Post subject:
PostPosted: Mon Jul 02, 2007 6:43 pm 
Beginner
Beginner

Joined: Thu Feb 22, 2007 6:08 am
Posts: 35
I already fixed, but i dont understand why! Follow is code:

Code:
ImovelHabitacional newImovelHabitacional = new ImovelHabitacional();
newImovelHabitacional.copyImovelHabitacional(imovelHabitacional);
returnObject = ImovelHabitacionalServletRequestsFacade.saveImovelHabitacional(newImovelHabitacional);

I thought that i should create a new instance of ImovelHabitacional, but with the information of the entity to be persisted, so i created a new instance and copy the values to it.

The i tryed to just put the id of the entity with the null value a "create" it like it was the first time. and it worked fine.
Code:
//ImovelHabitacional newImovelHabitacional = new ImovelHabitacional();
//newImovelHabitacional.copyImovelHabitacional(imovelHabitacional);
imovelHabitacional.setId(null);
returnObject = ImovelHabitacionalServletRequestsFacade.saveImovelHabitacional(imovelHabitacional);


To the EntityManager what is the diference between doing em.merge(newImovelHabitacional) and em.merge(imovelHabitacional). On the first case, why should the EntityManager thought it was the entity that was removed?
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avihaimar77
 Post subject: Hibernate check the identity in order to know
PostPosted: Mon Jul 02, 2007 10:07 pm 
Regular
Regular

Joined: Wed May 02, 2007 2:42 pm
Posts: 101
If the object is new (transient) or updated.

When you have an ID on the object hibernate think you want to update the object , but this object not exists.
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mpsantos
 Post subject:
PostPosted: Tue Jul 03, 2007 4:55 am 
Beginner
Beginner

Joined: Thu Feb 22, 2007 6:08 am
Posts: 35
Yes, thats wright. But the first one (newImovelHabitacional) had no id, it was null, and hibernate tought anyway that in time it was persisted witch is wrong.
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