Ok, so it is not possible actually to use TreeMap into pojoCache. But the pojocache inherits from treecache. Can I use put and get methods into PojoCache. I tried that. The use is strange. I have tested with 3 nodes, the 3 nodes view data put by only one node. If I stop the node from which we view data, we view data put by one of the 2 last nodes. If I stop the node from which we view data, we view data put by the last node. So, there is no data lost but there is not only one cache, or what ? I have probably miss something. Who can help me ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4137531#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...