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roele
 Post subject: PropertyAccessException on Parent/Child mapping
PostPosted: Tue Apr 18, 2006 5:14 pm 
Newbie

Joined: Tue Apr 18, 2006 5:03 pm
Posts: 5
I use Hibernate 3.1.3 with MySQL 5.0 and get a weird PropertyAccessException when i try to store my object.

Object
Is a class Projekt which can have subprojects. To prevent from unlimited nesting i throw an exception on the methods setParent(Projekt parent); and setSubProjekt(Projekt subProjekt); which causes Hibernate to fail in this case.

Mapping
Code:
       <many-to-one name="parent" column="Parent" not-null="false" />
        <set name="subProjekte" inverse="true" cascade="all,delete-orphan">
           <key column="Parent" not-null="false" />
           <one-to-many class="Projekt" />
        </set>


Stacktrace
Code:
Exception in thread "main" org.hibernate.PropertyAccessException: Exception occurred inside setter of ch.hftso.infox.model.Projekt.parent
   at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:65)
   at org.hibernate.tuple.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:330)
   at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:188)
   at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3232)
   at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:253)
   at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:114)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:98)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
   at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:502)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:494)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:490)
   at ch.hftso.infox.service.ProjektService.hinzufuegenProjekt(ProjektService.java:119)
   at ch.hftso.infox.testclient.TestClient.main(TestClient.java:121)
Caused by: java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:42)
   ... 15 more
Caused by: java.lang.Exception: Projekt mit Subprojekten muss Root sein!
   at ch.hftso.infox.model.Projekt.setParent(Projekt.java:120)
   ... 20 more


What is going wrong here?!
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roele
 Post subject:
PostPosted: Wed Apr 19, 2006 12:27 pm 
Newbie

Joined: Tue Apr 18, 2006 5:03 pm
Posts: 5
Could it be a mapping problem? Thought that throwing Exceptions should be no problem in Hibernate POJO's, isn't it?
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Marcio
 Post subject:
PostPosted: Wed Apr 19, 2006 5:12 pm 
Newbie

Joined: Wed Aug 18, 2004 8:44 am
Posts: 12
Please put here the code for the setter of the classes
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lmiranda
 Post subject:
PostPosted: Wed Apr 19, 2006 6:41 pm 
Beginner
Beginner

Joined: Mon Nov 29, 2004 2:26 pm
Posts: 28
roele wrote:
Could it be a mapping problem? Thought that throwing Exceptions should be no problem in Hibernate POJO's, isn't it?


no, that's not a good idea at all. if you throw an exception, hibernate won't be able to set the value and hence won't be able to save the class.
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roele
 Post subject:
PostPosted: Thu Apr 20, 2006 5:53 am 
Newbie

Joined: Tue Apr 18, 2006 5:03 pm
Posts: 5
Here is the method which causes the problem...

Code:

   public void subProjektHinzufuegen(Projekt p) throws Exception {
      if (parent==null){
        try{
           p.setParent(this);
           subProjekte.add(p);
         } catch (Exception e){
         throw e;
         }
      } else {
         throw new Exception("Subprojekt kann keine weiteren Subprojekte enthalten!");   
      }
   }



@Imiranda: Then i guess such things should be handled outside of a POJO?
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