[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6600) Clustered L2 cache does not support class definition updates

[Konrad Garus (JIRA)]

Clustered L2 cache does not support class definition updates
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                 Key: HHH-6600
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6600
             Project: Hibernate Core
          Issue Type: Bug
          Components: caching (L2)
    Affects Versions: 3.3.1
            Reporter: Konrad Garus


Hibernate caches raw arrays of field values in L2 cache. If that cache is clustered, and you want to update nodes one by one, you can get into a lot of trouble. Session may fetch a cache entry with old schema and blindly try and copy it to an entity. Sometimes it leads to ClassCastException. It also may lead to data corruption (disassembling a field as null and then saving that to database).

There does not seem to be a way to work this around. serialVersionUID is unsupported and I don't see a way to mark entity definition version anywhere in the mapping.

I'm experiencing this in 3.3.1, but from a brief source code inspection it seems to still be an issue in 4.

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