9:21 a.m.
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-957?page=co...
]
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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