Guillaume, we've been discussing best practices for sharing Cache instances between apps and currently, the best way to do so from AS is explained in http://tinyurl.com/lq688t, section 11.2. Paraphrasing Brian Stansberry, the AS Clustering Lead: anonymous wrote : 1) Use the CacheManager to create your cache; the CacheManager is available in JNDI at java:/CacheManager. See Section 11.2.1. | | 2) Use CacheJmxWrapperMBean and it's "cache" mbean attribute. Simplest way is to deploy it via a -service.xml. Section 5.4.2 of JBC 3.1 docs at http://tinyurl.com/m49qen has other methods. Either of those two methods should allow you to access a single Cache instance from any apps deployed in AS. This is recommended instead of your temporary solution. If you go over to the cluster dev list, you'll find a more detailed explanation from Brian himself. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4237888#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...