It is very nice of you, that you have explained about composite-id in hibernate so clearly.
Further to this, Could you please hint out , how to invoke the query and execute with HibernateTemplate.Find
Eagerly looking for your comment.

Thanks in advance.
Sridevi.

regarding your question in the last paragraph, you just need to define the mapping to the object reference to be “insertable=false, updatable=false” if you use annotation.

for example:

public class PurchaseTest {
private PurchaseTestId pk = new PurchaseTestId();
private Customer customer;

@EmbeddedId
public PurchaseTestId getPk() {
return this.pk;
}

public void setPk(PurchaseTestId pk) {
this.pk = pk;
}

public Customer getCustomer() {
return this.customer;
}

@ManyToOne
@JoinColumn(name=”CUSTOMER_ID”, insertable=false, updatable=false)
public void setCustomer(Customer customer) {
this.customer = customer;
}
}

For instance, your “PurchasedTestId” class maps the PKs for “customer” and “test” with Long values, instead of something like “Customer” or “Test”. If you had a need to navigate from that instance to the Customer or Test object, you couldn’t do it directly.

I’ve often wondered what would happen if you defined two properties in a class, one a boxed primitive used in the composite key, and the other a true object reference, and you mapped both of them in the mapping to the same column. I think there’s a possibility this could work when reading from the database, but I don’t know what it would do when writing.