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Author Message
mende
 Post subject: WrongClassException
PostPosted: Sun Mar 12, 2006 7:08 pm 
Newbie

Joined: Mon Nov 14, 2005 5:43 am
Posts: 6
Hi there,

I've read many things about WrongClassException (and of course) the solutions on the non-annotated way of using hibernate.

But I've got Hibernate running with annotations and run into trouble.

I do an Query for a specified (Just a get(WohnungMiete.java, id)) Subclass. This subclass retrieves the getTeaserImage() from the superclass on the TeaserBild-Class wich is an subclass of bilder.
But if this runs on the @OneToMany relationship to the ObjektBild
I retrieve the WrongClassException shown below.

Has anybody an solution for this? I've seen the WrongClassExceptions relating JDom but this doesn't fit to me (I think)

Thanks!

Marc

Hibernate version:
Hibernate 3.1.2
Hibernate Annotations 3.1 beta 8

Mapping documents:

Objekt.java:
Code:
package isi.as.hib.objekt;


import isi.as.hib.bilder.ObjektBild;
import isi.as.hib.bilder.TeaserBild;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;

import org.hibernate.annotations.GenericGenerator;

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
      name = "objekttyp",
      discriminatorType = DiscriminatorType.STRING
      )
public class Objekt implements Serializable {
   /**
    *
    */
   private static final long serialVersionUID = 1L;
   private String objektId;

// Properties deleted for more readability

   private List<ObjektBild> objektBilder;
   
   private TeaserBild teaserBild;


// Properties deleted for more readability

   @Id
   @GeneratedValue(generator="system-uuid")
   @GenericGenerator(name="system-uuid", strategy = "uuid")
   @Column(length=36)
   public String getObjektId() {
      return objektId;
   }

   public void setObjektId(String objektId) {
      this.objektId = objektId;
   }


// Properties deleted for more readability

   @OneToMany(targetEntity = ObjektBild.class, cascade=CascadeType.ALL )
    @JoinColumn(name="objektid")
   public List<ObjektBild> getObjektBilder() {
      return objektBilder;
   }

   public void setObjektBilder(List<ObjektBild> bilder) {
      this.objektBilder = bilder;
   }
   
   public void addObjektBild(ObjektBild bild) {
      if (this.objektBilder == null)
         this.objektBilder = new ArrayList<ObjektBild>();
      this.objektBilder.add(bild);
   }
   
   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name="teaserbild")
   public TeaserBild getTeaserBild() {
      return teaserBild;
   }

   public void setTeaserBild(TeaserBild teaserBild) {
      this.teaserBild = teaserBild;
   }


}


Used Sublcass of Objekt:
Code:
package isi.as.hib.objekt;

import isi.as.hib.bilder.GrundrissBild;

import javax.persistence.CascadeType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
@DiscriminatorValue("WOHNUNGMIETE")
public class WohnungMiete extends Objekt {

// No other relationships. All relationships are in Objekte.java

}



Bilder-Class:
Code:
package isi.as.hib.bilder;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Lob;

import org.hibernate.annotations.GenericGenerator;

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
      name = "bildtyp",
      discriminatorType = DiscriminatorType.STRING
      )
public class Bilder implements Serializable {

   /**
    *
    */
   private static final long serialVersionUID = 1L;
   private String bilderId;
   private byte[] bild;

   @Id
   @GeneratedValue(generator="system-uuid")
   @GenericGenerator(name="system-uuid", strategy = "uuid")
   @Column(length=36)
   public String getBilderId() {
      return bilderId;
   }
   public void setBilderId(String bilderId) {
      this.bilderId = bilderId;
   }


   @Lob
   public byte[] getBild() {
      return bild;
   }
   public void setBild(byte[] bild) {
      this.bild = bild;
   }

}


Subclass of Bilder (joined from subclass wohnungmiete)
Code:
package isi.as.hib.bilder;

import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
@DiscriminatorValue("OBJEKTBILD")
public class ObjektBild extends Bilder {

}




Code between sessionFactory.openSession() and session.close():

Code:
         if (session == null || !session.isOpen()) {
            session = HibernateUtil.getSessionFactory().openSession();
         }
         WohnungMiete wm = (WohnungMiete) session.get(WohnungMiete.class,
               getObjektId());
         setWohnungMiete(wm);
         
         ImageMetadata im = new ImageMetadata();


Full stack trace of any exception that occurs:

Code:
Caused by: org.hibernate.WrongClassException: Object with id: 402882fb09f078fc0109f07a87dd0003 was not of the specified subclass: isi.as.hib.bilder.ObjektBild (loaded object was of wrong class)
   at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1235)
   at org.hibernate.loader.Loader.getRow(Loader.java:1186)
   at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:569)
   at org.hibernate.loader.Loader.doQuery(Loader.java:689)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
   at org.hibernate.loader.Loader.loadCollection(Loader.java:1919)
   at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:71)
   at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:520)
   at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
   at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1695)
   at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
   at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
   at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:246)
   at org.apache.tapestry.coerce.CollectionToIteratorConverter.convertValue(CollectionToIteratorConverter.java:30)
   at org.apache.tapestry.coerce.TypeConverterWrapper.convertValue(TypeConverterWrapper.java:65)
   at $TypeConverter_109f07925f4.convertValue($TypeConverter_109f07925f4.java)
   at org.apache.tapestry.coerce.ValueConverterImpl.coerceValue(ValueConverterImpl.java:107)
   at $ValueConverter_109f07924be.coerceValue($ValueConverter_109f07924be.java)
   at org.apache.tapestry.components.Foreach.getSourceData(Foreach.java:62)
   at org.apache.tapestry.components.Foreach.renderComponent(Foreach.java:83)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434)
   at org.apache.tapestry.form.FormSupportImpl.render(FormSupportImpl.java:486)
   at org.apache.tapestry.form.Form.renderComponent(Form.java:250)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434)
   at org.apache.tapestry.components.RenderBody.renderComponent(RenderBody.java:44)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434)
   at org.apache.tapestry.html.Body.renderComponent(Body.java:129)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434)
   at org.apache.tapestry.html.Shell.renderComponent(Shell.java:114)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:92)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:92)
   at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617)
   at org.apache.tapestry.AbstractPage.renderPage(AbstractPage.java:275)
   at org.apache.tapestry.engine.RequestCycle.renderPage(RequestCycle.java:366)
   ... 37 more

Name and version of the database you are using:

Postgres 8.1.3 (win)

Debug level Hibernate log excerpt:

Code:
2006-03-12 23:24:49,312 [http-80-2] DEBUG - result set row: 0
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning '402882fb09f078fc0109f07a87dd0003' as column: bilderId36_0_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - result row: EntityKey[isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - Initializing object from ResultSet: [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - Hydrating entity: [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning 'asd' as column: beschrei3_36_0_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning 'false' as column: veroeffe4_36_0_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning 'false' as column: veroeffe5_36_0_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning 'asdf' as column: titel36_0_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning '402882fb09f078fc0109f07a1b290001' as column: objektid1_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - found row of collection: [isi.as.hib.objekt.WohnungMiete.grundrissBilder#402882fb09f078fc0109f07a1b290001]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - reading row
2006-03-12 23:24:49,312 [http-80-2] DEBUG - returning '402882fb09f078fc0109f07a87dd0003' as column: bilderId1_
2006-03-12 23:24:49,312 [http-80-2] DEBUG - loading entity: [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - attempting to resolve: [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - resolved object in session cache: [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - done processing result set (1 rows)
2006-03-12 23:24:49,312 [http-80-2] DEBUG - about to close ResultSet (open ResultSets: 1, globally: 1)
2006-03-12 23:24:49,312 [http-80-2] DEBUG - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2006-03-12 23:24:49,312 [http-80-2] DEBUG - closing statement
2006-03-12 23:24:49,312 [http-80-2] DEBUG - total objects hydrated: 1
2006-03-12 23:24:49,312 [http-80-2] DEBUG - resolving associations for [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - done materializing entity [isi.as.hib.bilder.GrundrissBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - 1 collections were found in result set for role: isi.as.hib.objekt.WohnungMiete.grundrissBilder
2006-03-12 23:24:49,312 [http-80-2] DEBUG - collection fully initialized: [isi.as.hib.objekt.WohnungMiete.grundrissBilder#402882fb09f078fc0109f07a1b290001]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - 1 collections initialized for role: isi.as.hib.objekt.WohnungMiete.grundrissBilder
2006-03-12 23:24:49,312 [http-80-2] DEBUG - initializing non-lazy collections
2006-03-12 23:24:49,312 [http-80-2] DEBUG - done loading collection
2006-03-12 23:24:49,312 [http-80-2] DEBUG - collection initialized
2006-03-12 23:24:49,312 [http-80-2] DEBUG - initializing collection [isi.as.hib.objekt.Objekt.objektBilder#402882fb09f078fc0109f07a1b290001]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - checking second-level cache
2006-03-12 23:24:49,312 [http-80-2] DEBUG - collection not cached
2006-03-12 23:24:49,312 [http-80-2] DEBUG - loading collection: [isi.as.hib.objekt.Objekt.objektBilder#402882fb09f078fc0109f07a1b290001]
2006-03-12 23:24:49,312 [http-80-2] DEBUG - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2006-03-12 23:24:49,312 [http-80-2] DEBUG - select objektbild0_.objektid as objektid1_, objektbild0_.bilderId as bilderId1_, objektbild0_.bilderId as bilderId36_0_, objektbild0_.beschreibung as beschrei3_36_0_, objektbild0_.veroeffentlichen as veroeffe4_36_0_, objektbild0_.veroeffentlichenWeb as veroeffe5_36_0_, objektbild0_.bild as bild36_0_, objektbild0_.titel as titel36_0_ from Bilder objektbild0_ where objektbild0_.objektid=?
2006-03-12 23:24:49,312 [http-80-2] DEBUG - preparing statement
2006-03-12 23:24:49,312 [http-80-2] DEBUG - binding '402882fb09f078fc0109f07a1b290001' to parameter: 1
2006-03-12 23:24:49,328 [http-80-2] DEBUG - about to open ResultSet (open ResultSets: 0, globally: 0)
2006-03-12 23:24:49,328 [http-80-2] DEBUG - result set contains (possibly empty) collection: [isi.as.hib.objekt.Objekt.objektBilder#402882fb09f078fc0109f07a1b290001]
2006-03-12 23:24:49,328 [http-80-2] DEBUG - uninitialized collection: initializing
2006-03-12 23:24:49,328 [http-80-2] DEBUG - processing result set
2006-03-12 23:24:49,328 [http-80-2] DEBUG - result set row: 0
2006-03-12 23:24:49,328 [http-80-2] DEBUG - returning '402882fb09f078fc0109f07a87dd0003' as column: bilderId36_0_
2006-03-12 23:24:49,328 [http-80-2] DEBUG - result row: EntityKey[isi.as.hib.bilder.ObjektBild#402882fb09f078fc0109f07a87dd0003]
2006-03-12 23:24:49,328 [http-80-2] DEBUG - about to close ResultSet (open ResultSets: 1, globally: 1)
2006-03-12 23:24:49,328 [http-80-2] DEBUG - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2006-03-12 23:24:49,328 [http-80-2] DEBUG - closing statement

Code:
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oliverlee20
 Post subject:
PostPosted: Mon Mar 13, 2006 1:52 am 
Newbie

Joined: Sat Mar 11, 2006 7:12 pm
Posts: 3
Location: Oklahoma City
Hi Marc,

I got quite similar exception as you did. And I used hibernate 3.0.5, I thought hibernate 3.1.2 may solve the issue. Now it looks like it still have the issue. Not sure whether it is because we did not use it properly.
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mende
 Post subject:
PostPosted: Mon Mar 13, 2006 3:45 am 
Newbie

Joined: Mon Nov 14, 2005 5:43 am
Posts: 6
Hi Oliver,

another user of hibernate wrote me that it could relate on the way hibernate
uses proxies on associations:

http://www.hibernate.org/hib_docs/v3/re ... mance.html
Section 19.1.13

May be it's that problem. I've got to look for it on the evening.
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mende
 Post subject:
PostPosted: Mon Mar 13, 2006 3:56 pm 
Newbie

Joined: Mon Nov 14, 2005 5:43 am
Posts: 6
Just to be complete (and not to waste any credits):

I've found the point with the WrongClass. It's because Hibernate doesn't take care of discriminator columns if you've got to associations on one table wich is subclassed.

Example:

I've got an Entity A and to Entities B and C. B and C are subclasses of A and have an Discriminator Column on the same table.
If there is another Entity Y wich have to associations (@OneToMany) one on B and one on C hibernate ignores the discriminator column and returns the C-entities also on the B associations. After getting these the entities returned are of type B and then the association of C crashes...

So a good way: Delete the associations on B and C, do them on A and handle the association by hand.

An
@Where(clause="[discriminator-column] = '[discriminator-value]'")
is your friend...

I think that might be truely a bug... Should it go into JIRA?

me
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oliverlee20
 Post subject:
PostPosted: Tue Mar 14, 2006 1:56 am 
Newbie

Joined: Sat Mar 11, 2006 7:12 pm
Posts: 3
Location: Oklahoma City
Hi Mende,

Atually I found the similar bug already recorded in JIRA. I got a suggestion that I should consider use simple approach, say per table per class instead of using the discrimator. I have not got time to try it out, but I will let you know.

Thanks
Oliver
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javajedi
 Post subject: So...
PostPosted: Thu Apr 13, 2006 7:41 pm 
Beginner
Beginner

Joined: Tue Dec 09, 2003 5:59 pm
Posts: 25
Location: Los Angeles
Anyone care to actually paste the bug number?
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kevin@adapt
 Post subject:
PostPosted: Thu Apr 13, 2006 8:27 pm 
Newbie

Joined: Thu Apr 13, 2006 8:00 pm
Posts: 2
I have a similar issue.

We have a versioned system thet I have entity E with oneToMeny to EVersions. then I have ETypeA and ETypeB extend E. ETypeAVersion and ETypeBVersion that extend EVersion.

Now I have another enitity B that has oneToMany to EVersions, when I call B.getEVersion,it returns my a set, however, when I tried to access the objects in the set, it throws me a wrongclassexception.

any suggestions?
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