[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-2571) Evaluating criteria expression with property of type Class throws "Unsupported discriminator type" exception

[Gail Badner (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gail Badner closed HHH-2571.
----------------------------

      Assignee: Gail Badner
    Resolution: Duplicate

> Evaluating criteria expression with property of type Class throws "Unsupported discriminator type" exception
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-2571
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2571
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: query-criteria
>    Affects Versions: 3.2.2, 3.2.3, 3.2.4
>         Environment: 3.2.3, Oracle
>            Reporter: Tim Vasil
>            Assignee: Gail Badner
>            Priority: Minor
>
> Here's a sample mapping:
> 	<class name="Event" table="tbl_event">
> 		<id name='id' column='objid'>
> 		            <generator class="sequence">
> 		                <param name="sequence">event_id_seq</param>
> 		            </generator>
> 		</id>
> 		<version name='version' column='version'/>
> 		<property name="timestamp" column="timestamp" not-null="true" />
> 		<property name="sourceObjectClass" column="source_object_class" type="Class"/>
> 	</class>
> Here's the criteria query I tried to execute:
> 	Criteria oCriteria = session.createCriteria(Event.class);
> 	oCriteria.add(Expression.eq("sourceObjectClass", czTargetClass));
> 	oCriteria.list();
> If and only if czTargetClass is a class that is mapped (such as Event.class, or any other class in the mapping file), a QueryException("Unsupported discriminator type " + type) exception is thrown in CriteriaQueryTranslator.java.
> This is a regression; the technique used to work in Hibernate 2 but broke when support for querying with discriminator types was added in Hibernate 3.
> You can see in CriteraQueryTranslator.getTypedValue() that when a value of type Class is passed in and SessionFactoryHelper.findQueryableUsingImports() returns a non-null value, the code assumes it must be a discriminator value.  This is not necessarily the case, though, as you can see in this example.
> The workaround I'm employing currently is to create a user-defined type that works like Hibernate's built-in ClassType but is able to query for classes based on String values in addition to Class values.

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