EJB Service and Eclipse Link marshalling error.

Question

Hi all. I have a problem with using EJB Service in BPEL.
I have two JPA entities linked with @OneToMany association
// RegistryItemBuffer
@Entity
@NamedQueries( { @NamedQuery(name =
"RegistryItemBuffer.findRegItemsBufByRegId",
query =
"select o from RegistryItemBuffer o where o.registry.registryId = :registryId") })
@Table(name = "PP_PERSON_ST_RG_ITEM_B")
public class RegistryItemBuffer implements Serializable {
private Long registryItemId;
private Registry registry;
private static final long serialVersionUID = 7526471155622776147L;
public RegistryItemBuffer() {
*@ManyToOne*
*@JoinColumn(name = "PP_PERSON_ST_RG_ID")*
*public Registry getRegistry() {*
return registry;
*public void setRegistry(Registry registry) {*
this.registry = registry;
//Registry
@Entity
@Table(name = "PP_PERSON_ST_RG")
public class Registry implements Serializable {
private Long registryId;
private Set<RegistryItemBuffer> registryItemBufferSet;
private static final long serialVersionUID = 7526471155622776100L;
public Registry() {
*@OneToMany(mappedBy = "registry", fetch = FetchType.EAGER)*
*public Set<RegistryItemBuffer> getRegistryItemBufferSet() {*
return registryItemBufferSet;
*public void setRegistryItemBufferSet(Set<RegistryItemBuffer> registryItemBufferSet) {*
this.registryItemBufferSet = registryItemBufferSet;
In my stateless session bean I have a method which fetches registry items by registry id using named query:
@SuppressWarnings("unchecked")
public List<RegistryItemBuffer> getRegistryItems(Long registryId) {
Query query =
em.createNamedQuery("RegistryItemBuffer.findRegItemsBufByRegId");
query.setParameter("registryId", registryId);
List<RegistryItemBuffer> items = query.getResultList();
return items;
If I call this method from EJB Client it works fine.
In my composite application I've add EJB Service. I have add a jar with EJB Remote Interface to SCA-INF/lib and specified JNDI path and remote interface in EJB Service Reference.
When I invoking getRegistryItems method from BPEL it fetches all items by the EclipseLink Exception throws at the end:
javax.xml.bind.MarshalException
- with linked exception:
[Exception [EclipseLink-7242] (Eclipse Persistence Services - 2.0.2.v20100323-r6872): org.eclipse.persistence.exceptions.Val
idationException
Exception Description: An attempt was made to traverse a relationship using indirection that had a null Session. This often
occurs when an entity with an uninstantiated LAZY relationship is serialized and that lazy relationship is traversed after
serialization. To avoid this issue, instantiate the LAZY relationship prior to serialization.]
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:375)
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:401)
Why EclipseLink cannot serialize fetched registry items ?
I would be grateful to any advice.
P.S. Sorry, If there is more appropriate forum.

Answer 1

Any clues to this one?