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Posted to dev@openjpa.apache.org by "Pinaki Poddar (JIRA)" <ji...@apache.org> on 2008/07/25 22:51:31 UTC
[jira] Assigned: (OPENJPA-660) ClassCastException when using
OneToMany Relation and collection is subclass using Discriminator with
SINGLE_TABLE strategy.
[ https://issues.apache.org/jira/browse/OPENJPA-660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pinaki Poddar reassigned OPENJPA-660:
-------------------------------------
Assignee: Pinaki Poddar
> 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
> Assignee: Pinaki Poddar
> Attachments: patch.txt, 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 (table dept) 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, suppose 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 subclass type while generating SQL query.
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