Lets see some code - how you create the list, how you use it, and the stack trace. Also, what version of JSF and Seam are you using. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031650#4031650 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4031650