Hibernate Issuing select statement even if FetchMode = Join

Question

I have a userAccount entity mapped with a country entity . The country mapping in UserAccount class is like this

@ManyToOne(fetch=FetchType.EAGER)
@Fetch(FetchMo         


        

Answer 1

I'm using the criteria query to fetch Customers.

public class PurchaseOrder
{
    .....
    .....      
    @ManyToOne(fetch=FetchType.EAGER, optional=true)
    @JoinColumn(name="ReportingCustomer_ID", nullable=true, insertable=false, updatable=false)
    @Fetch(FetchMode.JOIN)
    @NotFound(action=NotFoundAction.IGNORE)
    public ReportingCustomer getReportingCustomer()
    {
        return reportingCustomer;
    }
}

While getting PurchaseOrder it does a LEFT OUTER JOIN as below

select ... from PurchaseOrder this_ left outer join ReportingCustomer reportingc2_ 
on this_.ReportingCustomer_ID=reportingc2_.ReportingCustomer_ID
where ...

1. When there is an entry in ReportingCustomer - It fires only the above query.
2. When there is no entry for that record in ReportingCustomer - It fires a query for each PURCHASEORDER (m+1) queries.

I use "Progress" driver to connect to DB. I'm not sure why it fires m+1 queries only in scenario 2.