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

Clustered L2 cache does not support class definition updates ------------------------------------------------------------ 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.