I am using Hibernate 3.0 with JPA and Spring 2.0. I am using annotations to declare transactions, e.g.

@Transactional (propagation = Propagation.REQUIRED, readOnly = true)
public Collection<DataPoint> findDailyData(DataPointSpecification spec) {
return dataPointDao.findDailyData(spec);
}


And inside my model, I am using annotations to define relationships, e.g.
*/
@ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.LAZY)
@JoinColumn(name = "DATA_ELEMENT_ID", insertable=true, updatable=true)
public DataElement getDataElement() {
return this.dataElement;
}


However, when I try to access these relationships outside transaction, I get session closed exception. How do I define lazy associations in this case (other than making them eager).

Thanks in advance.

You will have to access the property within the scope of the same transaction. It will have the same effect as eager fetching in this use case but at lease you can use the lazy fetching in other use cases.



Farzad-

I know it works within same transaction, but I need lazy initialization outside transaction sort of similar to storing session in thread local.

I really doubt if there is any such solution since it can cause serious scaling problems but at the same time I might not be fully aware of all solutions. We can wait to see if anyone else has a novel idea.


Farzad-