[jboss-user] [JBossCache] - Optimistic Locking and CacheException problems

mimix do-not-reply at jboss.com
Tue Jul 18 08:54:32 EDT 2006


We are using TreeCache with NodeLockingScheme=OPTIMISTIC, IsolationLevel=REPEATABLE_READ, CacheMode=INVALIDATION_ASYNC

I'm having a hard time understanding how versioning works, and if it has some relation to equals/hashcode/tostring of our model objects (the ones that are mapped with hibernate). I have the following scenario in JMeter: 50 threads running simultaneously, searching for objects, creating new objects and persisting them. Only one instance of JBoss is running. 

Around 20% of the time we get the folling exception:

Caused by: org.jboss.cache.CacheException: DataNode [/a/b/c/d/Telephone] version Ver=41 is newer than workspace node Ver=40

As far as I understand, after a "put" there should be an "evict" so this situation shouldn't occur unless 2 threads update the same object simultaneously (however, we are creating different objects all the time) 

When I run with 10 threads or so the error does not occur.

Hibernate is 3.2, JBoss is 4.0.4 and JBossCache 1.4

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