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Date: Wed, 16 Jul 2008 03:13:31 -0700 (PDT)
From: "Vikram Bhatia (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Updated: (OPENJPA-660) ClassCastException when using
 OneToMany Relation and collection is subclass using Discriminator with
 SINGLE_TABLE strategy.
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     [ https://issues.apache.org/jira/browse/OPENJPA-660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vikram Bhatia updated OPENJPA-660:
----------------------------------

    Attachment: testInheritance.zip

Testcase with junit test TestCollection class.

> ClassCastException when using OneToMany Relation and collection is subclass using Discriminator with SINGLE_TABLE strategy.
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-660
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-660
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>    Affects Versions: 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.1.0, 1.1.1, 1.2.0
>            Reporter: Vikram Bhatia
>         Attachments: testInheritance.zip
>
>
> If the entity has OneToMany relation and collection is declared as subclass which uses SINGLE_TABLE inheritance strategy, it fetches all rows irrespective of Discriminator value and throws ClassCastException.
> There is entity Department having OneToMany relation with another entity FullTimeEmployee. 
>   @OneToMany (mappedBy="dept", cascade=CascadeType.ALL)
>   private Collection<FullTimeEmployee> fullTimeEmployees;
> There is abstract class Employee with
> @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
> @DiscriminatorColumn(name="TYPE")
> There are two entity classes FullTimeEmployee and PartTimeEmployee which extends Employee (table emp) with Discriminator values 'F' and 'P' respectively.
> Now, Support emp table contains 2 rows of PartTimeEmployee and 2 rows of FullTimeEmployee and if test class fetches Department object and calls dept.getFullTimeEmployees(), it throws ClassCastException as it gets 4 rows and doesn't use discriminator and sub class type while generating SQL query.

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