[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3353) Id of an entity is not set when it is a proxy in a collection

[Pascal Perez (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30589 ] 

Pascal Perez commented on HHH-3353:
-----------------------------------

This is not a bug, but rather a feature improvement:

If the getId() method is final, the proxy cannot override it. Hibernate should output a warning message/crash when it notices that.

> Id of an entity is not set when it is a proxy in a collection
> -------------------------------------------------------------
>
>                 Key: HHH-3353
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3353
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.1
>         Environment: Observed on MySQL 5, unit tested on HSQLDB.
>            Reporter: Pascal Perez
>         Attachments: entities.zip
>
>
> In plain English:
> With three entities, Item, Comment and Category such that
>   Item has multiple Comment (one to many)
>   Comment has one or no Category (many to one)
> have one item with one comment that is linked to one category. Load the item, read the category's id. It's not being set by Hibernate.
> In unit test (fails at the very last assertNotSame):
> // creating an item
> Session session = sessionFactory.openSession();
> Transaction tx = session.beginTransaction();
> Item item = new Item();
> Comment comment = new Comment();
> comment.item = item;
> item.comments.add(comment);
> comment.category = new Category();
> session.save(item);
> session.save(comment.category);
> assertNotSame("after save, category's id must not be 0",
>     0, comment.category.id);
> tx.commit();
> session.close();
> // load the item and read the rating's id
> session = sessionFactory.openSession();
> item = (Item) session.get(Item.class, item.id);
> assertNotSame("after load, category's id must not be 0",
>     0, item.comments.iterator().next().category.id);
> session.close();

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