How do you obtain your JBoss Cache instance right now? If it is shared via JNDI or JMX, then there's your singleton. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117057#4117057 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4117057