Salut, that was my fault. In jboss.xml deployment descriptor i have overseen, that assigned in a stateful session bean the following standard setting: <configuration-name>Standard Stateless Sessionbean</configuration-name> That has in turn no instance-cache assignment in the default container definition. The good this is, that a started to understand the cool architecture of jboss. Thanks for your audience;-) Groovie View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4232257#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...