Intermittent ConcurrentModificationException in cluster

2008-07-27 04:54:15,359 ERROR [DefaultQuartzScheduler_Worker-0] [sf.hibernate.collection.PersistentCollection] initialize Failed to lazily initialize a collection
java.util.ConcurrentModificationException: Cache "com.atlassian.confluence.core.ContentEntityObject.bodyContents": Resource is locked by another thread or member: Lease: 
542474737 (Cache=com.atlassian.confluence.core.ContentEntityObject.bodyContents, Size=Unknown, Version=12/1, IssuerId=4, HolderId=4, Status=LEASE_DIRTY, Locked at Sun Jul
 27 04:54:06 CDT 2008, Expires in 591992 millis)
        at com.tangosol.coherence.component.util.daemon.queueProcessor.service.ReplicatedCache.updateResource(ReplicatedCache.CDB:96)
        at com.tangosol.coherence.component.util.CacheHandler.put(CacheHandler.CDB:11)
        at com.tangosol.coherence.component.util.CacheHandler.put(CacheHandler.CDB:1)
        at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
        at com.atlassian.confluence.cache.tangosol.hibernate.CoherenceHibernateCache.put(CoherenceHibernateCache.java:29)
        at net.sf.hibernate.cache.ReadWriteCache.put(ReadWriteCache.java:146)
        at net.sf.hibernate.impl.SessionImpl.endLoadingCollections(SessionImpl.java:3135)
        at net.sf.hibernate.impl.SessionImpl.endLoadingCollections(SessionImpl.java:3101)
        at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:324)
        at net.sf.hibernate.loader.Loader.doQuery(Loader.java:309)
        at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:138)
        at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:1020)
        at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:995)
       ....