[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-2363) Hibernate is returning zero for the ID of a persistent object

[Archie Cobbs (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2363?page=all ]

Archie Cobbs updated HHH-2363:
------------------------------

    Attachment: TRAK-3910.zip

> Hibernate is returning zero for the ID of a persistent object
> -------------------------------------------------------------
>
>          Key: HHH-2363
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2363
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.2.0.ga
>  Environment: Hibernate 3.2.1 GA running on SuSE Linux
> MySQL 4.1.13
> java version "1.5.0_06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
>     Reporter: Archie Cobbs
>  Attachments: TRAK-3910.zip
>
>
> I have two classes, {{Patient}} and {{Room}}, where {{Patient}} has a FK many-to-one reference to {{Room}}, representing a room assignment.
> Both classes use a Java {{long}} field named "id" as their identifier.
> When I create a Session and find a Patient with a room assignment, the Patient's identifier is correct but the Room's identifier, when accessed via {{patient.getAssignedRoom().getId()}}, is ZERO. However, in the database the value is one and {{session.getIdentifier(patient.getAssignedRoom())}} also returns one, in contradiction.
> A simple reproducible test case will be attached. Instructions:
> # Edit {{doit.sh}} and set {{HIBERNATE_DIR}} to point to an unpacked {{hibernate-3.2.0.ga.tar.gz}} directory
> # Set {{MYSQL_CONNECTOR_JAVA}} to point to {{myslq-connector-java.jar}}
> # Set {{DATABASE_USERNAME}} and {{DATABASE_PASSWORD}} if needed
> # Run {{doit.sh}}.
> The output I get at the end is this:
> {noformat}
> 2037 [main] INFO org.hibernate.cache.StandardQueryCache  - starting query cache at region: org.hibernate.cache.StandardQueryCache
> Hibernate: select this_.id as id0_0_, this_.assignedRoom as assigned2_0_0_, this_.name as name0_0_, this_.medicalRecordNumber as medicalR4_0_0_ from Patient this_ where this_.medicalRecordNumber=?
> Hibernate: select room0_.id as id1_0_, room0_.name as name1_0_ from Room room0_ where room0_.id=?
> 2195 [main] INFO Main  - patient=Patient[Fred Example] patient.assignedRoom=Room[Room 101]
> 2196 [main] INFO Main  - patient.id=1
> 2196 [main] INFO Main  - patient.assignedRoom.id=0
> 2196 [main] ERROR Main  - WTF? ID OF ROOM IS ZERO!
> 2196 [main] INFO Main  - patient.assignedRoom.id=1
> {noformat}
> Note the line {{patient.assignedRoom.id=0}} ... see the corresponding code in {{Main.java}}.

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