ajax4jsf has no ajax:autocomplete component. Could you double check what the component library you are using? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4025237#4025237 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4025237