Hi all,
I want to get objects with their lists, even when the lists are empty. So I've witten this query:
"SELECT i FROM Invoice i LEFT OUTER JOIN i.itemList items"
But this query never returns invoices without items! Only invoices with items.
When I remove mappedBy from @OneToMany annotation, LEFT JOIN works correctly.
Is this normal behaviour?
Thank you
Michael
Sample application
public class JavaApplication {
public static void main(String[] args) {
com.objectdb.Enhancer.enhance("javaapplication.*");
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("$objectdb/db/test.odb");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
Invoice i1 = new Invoice("1");
em.persist(i1);
Invoice i2 = new Invoice("2");
i2.getItemList().add(new InvoiceItem(i2));
em.persist(i2);
Invoice i3 = new Invoice("3");
em.persist(i3);
em.getTransaction().commit();
Query query = em.createQuery(
"SELECT i FROM Invoice i LEFT OUTER JOIN i.itemList items");
List resultList = query.getResultList();
System.out.println(resultList);
em.close();
emf.close();
}
}
@Entity
public class Invoice {
@OneToMany(mappedBy = "invoice", fetch= FetchType.EAGER, orphanRemoval=true, cascade= CascadeType.ALL)
private List<InvoiceItem> itemList = new ArrayList<InvoiceItem>();
private String name;
public Invoice(String name){
this.name = name;
}
public List<InvoiceItem> getItemList() {
return itemList;
}
@Override
public String toString() {
return name;
}
}
@Entity
public class InvoiceItem{
@ManyToOne
private Invoice invoice;
InvoiceItem(Invoice i) {
this.invoice = i;
}
} 
