is it possible to do this? if so, which config/xml file? I searched C:\jboss-4.2.1.GA\server\default\conf for "passivate" and "passivation" and no hits for either keyword. I read in Roman Mastering EJB book that ejb containers used algorithms like LRU and MRU to determine when to passivate a SFSB. Also, I read in the EJB3 in action book that the instance variables in a SFSB need to be java primitive or classes that implement Serializable interface. What happens if they're not one of these? What exception, if any, will be thrown when the ebj container goes to passivate/serialize a SFSB? thx. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4106532#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...