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

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.