JPA Generic entities classes Mappedsuperclass are not possible!

Hi,
I have came to understand this:
You can use generics with fields in a class, but you cannot make the class generic or a collection in a generic form. I hope that I stated what I wanted correctly.
This is the normal generics known to JPA!
public class MyEntity{
@OneToMany
List<OtherEntity> others;But the next is not allowed!
public class MyEntity<T extends OtherEntity>{
@OneToMany List<T> other;
}Please comment on this if this is true or false, as I have encountered this error while trying the same!
I am using Toplink for a desktop Application
Thank you
javax.persistence.PersistenceException: No Persistence provider for EntityManager named Access1: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory:
oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Local Exception Stack:
Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@fabe9
Internal Exception: javax.persistence.PersistenceException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [Access1] failed.
Internal Exception: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
        at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143)
        at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
        at edu.acis.ccms.ui.MainRMIServerInterface.connectDB(MainRMIServerInterface.java:342)
        at edu.acis.ccms.ui.MainRMIServerInterface.<init>(MainRMIServerInterface.java:102)
        at edu.acis.ccms.ui.MainRMIServerInterface.main(MainRMIServerInterface.java:1804)
        at edu.acis.ccms.main.Main.runCCMSServer(Main.java:18)
        at edu.acis.ccms.main.Main.main(Main.java:35)
Caused by: javax.persistence.PersistenceException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [Access1] failed.
Internal Exception: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:643)
        at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.callPredeploy(JavaSECMPInitializer.java:171)
        at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:239)
        at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:255)
        at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:155)
        ... 7 more
Caused by: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [Access1] failed.
Internal Exception: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
        at oracle.toplink.essentials.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:228)
        ... 12 more
Caused by: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject.getRawClass(MetadataAccessibleObject.java:120)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataHelper.isEmbedded(MetadataHelper.java:732)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.buildAccessor(ClassAccessor.java:193)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessorFields(ClassAccessor.java:541)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessors(ClassAccessor.java:567)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processMappedSuperclass(ClassAccessor.java:1128)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.MappedSuperclassAccessor.process(MappedSuperclassAccessor.java:63)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processMappedSuperclasses(ClassAccessor.java:1138)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.process(ClassAccessor.java:495)
        at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.processAnnotations(MetadataProcessor.java:240)
        at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:370)
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:607)
        ... 11 moreEdited by: hmulhim on Feb 27, 2008 3:00 AM
Edited by: hmulhim on Feb 27, 2008 3:01 AM

No you will be unable to make the Entities generic. The provider will be unable to map the relationship to the specific type defined by the generic definition as this type is assigned when the Entity is created in code not where the Entity is defined. Remember when designating Generics the Collection (in this case) is limited only to those types. The Provider can not possibly be this restrictive on a per Entity instance basis. In some cases changing the type may result in entirely different tables being mapped for a single Entity instance and that is definitely not supported.
Having said that this is a pretty poor exception that I will file a bug for.
--Gordon

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