Hibernate version:3.1.rc1

I have a domain object called product that uses OptimisticLockType.VERSION, with a column of type @Version.

This product domain object has a reference to OrderLineItem via a many-to-one relationship. When I try to create a OrderLineItem I get the following error:

not-null property references a null value.

Here is a snippet of the code:
OrderLineItem lineItem = new OrderLineItem();
Product product = new Product();
product.setId(1)

lineItem.setProduct(product).

entityManager.persist(lineItem).

This causes the error above.

If I add the following code:
product.setVersion(1)

Then no error.

Any ideas why I have to set the Version column in the product domain object?

Why are you setting the ID yourself ? Are you using the "assigned" ID Generator ?

This is the case where the product has already been created, and yes I do use assign generator for the product domain object.

What I am trying to do is create the OrderLineItem using an existing product that a user has selected via a GUI. The id I set gets passed to me and I use that one when associating the product to the OrderLineItem

If you want to add an OrderLineItem to an existing Product and assign it to the new OLI. You can't just create a dummy Product with the same key.

From Hibernate Reference doc - section 6.1.7

"A version or timestamp property should never be null for a detached instance, so Hibernate will detect any instance with a null version or timestamp as transient, no matter what other unsaved-value strategies are specified...."

makes perfect sense. I have already started to change my code to retrieve the Product from the database and then associating this product to the OrderLineItem object.

I assume this only needs to happen when I use OptimisticLocking in a Domain Object?

In the reference doc, you can find this:



Hope this is useful.

Useful, but I am using EJB3 with annotations, and it does not look like the @Version annotaion supports these properties.

From my Product domain object
@Version
@Column(name = "version")
private Integer version;