[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-5087) A @ManyToOne field on the same entity class is null when 2nd level cache is enabled

[Gail Badner (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gail Badner resolved HHH-5087.
------------------------------

    Resolution: Duplicate

> A @ManyToOne field on the same entity class is null when 2nd level cache is enabled
> -----------------------------------------------------------------------------------
>
>                 Key: HHH-5087
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5087
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: caching (L2)
>    Affects Versions: 3.3.0.CR1, 3.5.0-Final
>            Reporter: Joseph Pachod
>            Assignee: Gail Badner
>         Attachments: demos.tar.gz
>
>
> The issue is based on this discussion https://forum.hibernate.org/viewtopic.php?p=2350265 which shows how to have a List with the index managed by Hibernate. 
> The example given involves two distinct entities classes, for example ParentEntity.class et ChildEntity.class.
> I tried to use it as well for a List containing the same entity, like that (see attachment for more details):
> public class RecursiveListItem 
> {
> (..)
>     public void setParent(final RecursiveListItem parent)
>     {
>         this.parent = parent;
>     }
>     public RecursiveListItem getParent()
>     {
>         return parent;
>     }
>     public static final String RECURSIVELISTITEM_ONETOMANY_INDEX_COLUMN_NAME = "recursivelistitem_position";
>     public static final String RECURSIVELISTITEM_ONETOMANY_JOIN_COLUMN_NAME = "recursivelistitem_id";
>     @ManyToOne
>     @JoinColumn(name = RECURSIVELISTITEM_ONETOMANY_JOIN_COLUMN_NAME, insertable = false, updatable = false)
>     private RecursiveListItem parent;
>     @SuppressWarnings("unused")
>     @Column(name = RECURSIVELISTITEM_ONETOMANY_INDEX_COLUMN_NAME, insertable = false, updatable = false)
>     private Integer position;
>     @OneToMany(fetch = FetchType.LAZY)
>     @JoinColumn(name = RecursiveListItem.RECURSIVELISTITEM_ONETOMANY_JOIN_COLUMN_NAME)
>     @org.hibernate.annotations.IndexColumn(name = RecursiveListItem.RECURSIVELISTITEM_ONETOMANY_INDEX_COLUMN_NAME)
>     private List<RecursiveListItem> children = new ArrayList<RecursiveListItem>();
> (...)
> }
> In my test case, I do :
> 		EntityManager entityManager = entityManagerFactory.createEntityManager();
> 	
> 		RecursiveListItem parent = new RecursiveListItem();
> 		RecursiveListItem child = new RecursiveListItem();
> 		
> 		persist(entityManager, parent);
> 		persist(entityManager, child);
> 		
> 		parent.getChildren().add(child);
> 		child.setParent(parent);
> 		
> 		persist(entityManager, parent);
> 		persist(entityManager, child);
> 		
> 		entityManager.close();
> 		
> 		entityManager = entityManagerFactory.createEntityManager();
> 		RecursiveListItem childFound = entityManager.find(RecursiveListItem.class, child.getId());
> 		assertNotNull(childFound);
> 		assertNotNull(childFound.getParent());
> The last line works when the 2nd level cache and fails otherwise.
> The issue applies both for 3.5 and 3.3.0.CR1. In the attached file I put two maven enabled eclipse projects, on for 3.5 and one for 3.3.0.CR1.
> Thanks in advance
> best regards
> joseph
> ps : I'll be on vacation until next Monday (April 12)

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