[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-3169) 3.2.6 breaks implicit join for collections

[Gail Badner (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gail Badner resolved HHH-3169.
------------------------------

      Assignee: Gail Badner
    Resolution: Rejected

Implicit joins across collections is not supported. This is documented in the migration guide at  http://www.hibernate.org/250.html#A42 as well as the online reference documentation . You need to use an explicit join.

> 3.2.6 breaks implicit join for collections
> ------------------------------------------
>
>                 Key: HHH-3169
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3169
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: query-hql
>    Affects Versions: 3.2.6
>            Reporter: Michael Newcomb
>            Assignee: Gail Badner
>
> The implicit join query "Cat.by.kitten.name2" below works fine in 3.2.5, but will fail to initialize in 3.2.6:
> import java.util.Set;
> import java.util.HashSet;
> import java.util.List;
> import javax.persistence.Id;
> import javax.persistence.OneToMany;
> import javax.persistence.Entity;
> import javax.persistence.NamedQueries;
> import javax.persistence.NamedQuery;
> import javax.persistence.Query;
> @Entity
> @NamedQueries(value = {
> @NamedQuery(
>   name = "Cat.by.kitten.name",
>   query = "select c from Cat c inner join c.kittens as kitten with kitten.name=:name"),
> @NamedQuery(
>   name = "Cat.by.kitten.name2",
>   query = "select c from Cat c where c.kittens.name=:name")
>   }
> )
> public class Cat
> {
>   @Id
>   protected String name;
>   @OneToMany
>   protected Set<Cat> kittens = new HashSet<Cat>();
>   public Cat(String name)
>   {
>     this.name = name;
>   }
>   public Set<Cat> getKittens()
>   {
>     return kittens;
>   }
>   public static void main(String... args)
>   {
>     EntityManager entityManager;
>     entityManager.getTransaction().begin();
>     Cat mom = new Cat("mom1");
>     Cat kitten1 = new Cat("mom1.kitten1");
>     Cat kitten2 = new Cat("mom1.kitten2");
>     entityManager.persist(mom);
>     entityManager.persist(kitten1);
>     entityManager.persist(kitten2);
>     mom.getKittens().add(kitten1);
>     mom.getKittens().add(kitten2);
>     mom = new Cat("mom2");
>     kitten1 = new Cat("mom2.kitten1");
>     kitten2 = new Cat("mom2.kitten2");
>     entityManager.persist(mom);
>     entityManager.persist(kitten1);
>     entityManager.persist(kitten2);
>     mom.getKittens().add(kitten1);
>     mom.getKittens().add(kitten2);
>     entityManager.getTransaction().commit();
>     Query query = entityManager.createNamedQuery("Cat.by.kitten.name");
>     query.setParameter("name", "mom1.kitten1");
>     for (Cat cat : (List<Cat>) query.getResultList())
>     {
>       System.out.println(cat.name);
>     }
>     query = entityManager.createNamedQuery("Cat.by.kitten.name2");
>     query.setParameter("name", "mom1.kitten1");
>     for (Cat cat : (List<Cat>) query.getResultList())
>     {
>       System.out.println(cat.name);
>     }
>   }
> }

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