[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-957) SubqueryExpression throws ClassCastException on DetachedCriteria subqueries
john john (JIRA)
noreply at atlassian.com
Mon Dec 18 10:21:05 EST 2006
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-957?page=comments#action_25656 ]
john john commented on HHH-957:
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> SubqueryExpression throws ClassCastException on DetachedCriteria subqueries
> ---------------------------------------------------------------------------
>
> Key: HHH-957
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-957
> Project: Hibernate3
> Type: Bug
> Versions: 3.0.5
> Environment: Oracle 9i, but probably not DB specific.
> Reporter: Rob MacGrogan
> Priority: Minor
> Attachments: SubqueryExpression.java, SubqueryExpression.java, subcriteria-patch.txt
>
>
> The toSqlString() method in SubqueryExpression contains a line that casts a Criteria object to CriteriaImpl in order to call the getSession() method. However, if DetachedCriteria is used as a subquery in a Criteria query, the underlying Criteria object will be CriteriaImpl.Subcriteria, thus a ClassCastException will be thrown.
> I have created a bug fix. Add the following method to SubqueryExpression:
> private SessionImpl getSessionImpl(Criteria criteria) {
> SessionImpl session = null;
> if (criteria instanceof CriteriaImpl) {
> CriteriaImpl impl = (CriteriaImpl)criteria;
> session = impl.getSession();
> }
> else if (criteria instanceof CriteriaImpl.Subcriteria){
> CriteriaImpl.Subcriteria sub = (CriteriaImpl.Subcriteria)criteria;
> //Alert! Recursive call here!
> session = getSessionImpl(sub.getParent());
> }
> return session;
> }
> And then replace the offending line in toSqlString() with a call to the new method.
> Attached is SubqueryExpression with proposed changes in place.
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