[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2352) ClassCastException in Session.get()
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http://opensource.atlassian.com/projects/hibernate/browse/HHH-2352?page=c...
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Alexey Romanchuk commented on HHH-2352:
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In javadoc for get function we see:
"Return the persistent instance of the given entity class with the given identifier,
or null if there is no such persistent instance"
Due this description hibernate should return null but not object of other class. This may
affect find() function of entity manager.
ClassCastException in Session.get()
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Key: HHH-2352
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2352
Project: Hibernate3
Type: Bug
Components: core
Versions: 3.2.1
Environment: Hibernate 3.2.1
Reporter: Alexey Romanchuk
Priority: Critical
We have inheritance with joined-subclass mapping. Imagine that we have parent class -
BaseObject and two subclasses - Client and Item. We enable second level cache on
BaseObject.
try to load Client in first session
Client client = ( Client ) s1.get( Client.class, 1851727l );
after this we have this client in second level cache.
Next - load another subclass with same id:
Item item = ( Item ) s2.get( Item.class, 1851727l );
and here we have ClassCastException because hibernate found BaseObject (Client) and
return it instead of null.
The solution is class check in
org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache() function. This
is crititcal bug that violates Session API.
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