[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-3817) JBC second level cache integration can cache stale collection data

JBC second level cache integration can cache stale collection data ------------------------------------------------------------------ Key: HHH-3817 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3817 Project: Hibernate Core Issue Type: Bug Components: caching (L2) Reporter: Brian Stansberry Assignee: Brian Stansberry Fix For: 3.3.x Scenario with two transactions dealing with a single collection: tx1 reads collection, cache miss tx1 goes to database to read collection tx2 reads collection, cache miss tx2 goes to database to read collection tx2 does JBC putForExternalRead to store empty collection tx2 updates collection tx2 removes collection from JBC (since any collection update triggers a org.hibernate.cache.Cache.evict which is implemented as a JBC removeNode) tx1 does JBC putForExternalRead to store empty collection -- STALE DATA With entities, if the db is using REPEATABLE_READ this won't be a problem, as the DB won't allow the tx2 update until tx1 commits. With a collection there is nothing to lock on. It would be a problem for entities with READ_COMMITTED as well.