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Date: Wed, 16 Jul 2008 03:11:32 -0700 (PDT)
From: "Vikram Bhatia (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Created: (OPENJPA-660) ClassCastException when using
 OneToMany Relation and collection is subclass using Discriminator with
 SINGLE_TABLE strategy.
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ClassCastException when using OneToMany Relation and collection is subclass using Discriminator with SINGLE_TABLE strategy.
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                 Key: OPENJPA-660
                 URL: https://issues.apache.org/jira/browse/OPENJPA-660
             Project: OpenJPA
          Issue Type: Bug
          Components: jpa
            Reporter: Vikram Bhatia


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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