"manik.surtani(a)jboss.com" wrote : http://jira.jboss.com/jira/browse/JBCACHE-1148 | Awesome! I decided to get JBossCache from CVS and try it. I haven't checked the performance, but I still got the concurrency problems: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841) at java.util.HashMap$EntryIterator.next(HashMap.java:883) at java.util.HashMap$EntryIterator.next(HashMap.java:881) at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1347) at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1349) at org.jboss.cache.util.MapCopy.(MapCopy.java:40) at org.jboss.cache.notifications.Notifier.copy(Notifier.java:611) at org.jboss.cache.notifications.Notifier.notifyNodeModified(Notifier.java:236) at org.jboss.cache.CacheImpl._remove(CacheImpl.java:2555) What happens is that multiple threads are putting and removing keys in the same node, and the cache doesn't seem to like it. This is not really related to the original message, should I start a new thread about it? Thanks Adrian View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4066121#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...