Tom,
Am i doing something wrong?
If I change in Java SE persistence example (from
https://glassfish.dev.java.net/javaee5/persistence/persistence-example.html)
from:
private Collection<Order> orders = null;
to:
private Collection<Order> orders = new HashSet<Order>();
I get the following exception, which does not depend on field or property based
access type:
[TopLink Info]: 2006.05.04 03:41:34.992--ServerSession(19739141)--TopLink,
version: Oracle TopLink Essentials - 2006.4 (Build 060412)
[TopLink Info]: 2006.05.04
03:41:37.658--ServerSession(19739141)--file:/faith4/gf/glassfish/www/javaee5/persistence/ex1/classes-pu1
login successful
Exception in thread "main" javax.persistence.EntityExistsException:
Exception Description: The mapping for the attribute [orders] uses transparent
indirection so the attribute [orders] must be initialized to an appropriate
container. Currently the value is [[]].
- JDK 1.1.x: an instance of IndirectList, IndirectMap or Hashtable, or one of
their subclasses.
- JDK 1.2 or higher: an instance of an implementor of Collection or Map.
Mapping: oracle.toplink.essentials.mappings.OneToManyMapping[orders]
Descriptor: RelationalDescriptor(entity.Customer --> [DatabaseTable(CUSTOMER)])
at
oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:153)
at client.Client.testInsert(Client.java:82)
at client.Client.main(Client.java:49)
Caused by: Exception [TOPLINK-150] (Oracle TopLink Essentials - 2006.4 (Build
060412)): oracle.toplink.essentials.exceptions.DescriptorException
Exception Description: The mapping for the attribute [orders] uses transparent
indirection so the attribute [orders] must be initialized to an appropriate
container. Currently the value is [[]].
- JDK 1.1.x: an instance of IndirectList, IndirectMap or Hashtable, or one of
their subclasses.
- JDK 1.2 or higher: an instance of an implementor of Collection or Map.
Mapping: oracle.toplink.essentials.mappings.OneToManyMapping[orders]
Descriptor: RelationalDescriptor(entity.Customer --> [DatabaseTable(CUSTOMER)])
at
oracle.toplink.essentials.exceptions.DescriptorException.indirectContainerInstantiationMismatch(DescriptorException.java:658)
at
oracle.toplink.essentials.internal.indirection.TransparentIndirectionPolicy.validateAttributeOfInstantiatedObject(TransparentIndirectionPolicy.java:368)
at
oracle.toplink.essentials.mappings.ForeignReferenceMapping.getAttributeValueFromObject(ForeignReferenceMapping.java:296)
at
oracle.toplink.essentials.mappings.CollectionMapping.cascadeRegisterNewIfRequired(CollectionMapping.java:237)
at
oracle.toplink.essentials.internal.descriptors.ObjectBuilder.cascadeRegisterNewForCreate(ObjectBuilder.java:1241)
at
oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3175)
at
oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:149)
... 2 more
thanks,
-marina