[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2828) criteria search by class throws org.hibernate.QueryException: Unsupported discriminator type null when mapping exists for this class

[jo desmet (JIRA)]

criteria search by class throws org.hibernate.QueryException: Unsupported discriminator type null  when mapping exists for this class
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                 Key: HHH-2828
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2828
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.5
         Environment: hibernate 3.2.5, oracle 10g
            Reporter: jo desmet
         Attachments: src.zip

when making a criteria based on a property of type class the query succeeds if this class is not mapped, the query building fails when this class is mapped within hibernate and has no discriminator

e.g. code :

                Criteria l = session.createCriteria(SearchClass.class);
                l.add(Restrictions.eq("type", ClassWithNoMapping.class));  // SUCCESS
                java.util.List result = l.list();
                l = session.createCriteria(SearchClass.class);
                l.add(Restrictions.eq("type", ClassWithMapping.class));   // EXCEPTION
                result = l.list();

exception is 

Hibernate: select this_.ID as ID0_0_, this_.name as name0_0_, this_.type as type0_0_ from SEARCHCLASS this_ where this_.type=?
org.hibernate.QueryException: Unsupported discriminator type null
	at org.hibernate.loader.criteria.CriteriaQueryTranslator.getTypedValue(CriteriaQueryTranslator.java:499)
	at org.hibernate.criterion.SimpleExpression.getTypedValues(SimpleExpression.java:71)
	at org.hibernate.loader.criteria.CriteriaQueryTranslator.getQueryParameters(CriteriaQueryTranslator.java:251)
	at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:95)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
	at Test.list(Test.java:40)
	at Test.main(Test.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)


classes are attached, tables should exists but no data is required.

Please also provide workaround on short term if possible

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