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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (OPENJPA-660) ClassCastException when using OneToMany Relation and collection is subclass using Discriminator with SINGLE_TABLE strategy.
Date Fri, 25 Jul 2008 20:51:31 GMT

     [ 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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