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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