I get duplicate IDs in my apps when using JBoss 4.2.0.GA with Tomahawk 1.1.5 + Facelets 1.1.12 added. None of my pages assign an ID, the duplicates are all of the generated kind. Commenting out parts of the page just causes the duplicate to occur somewhere else. Sometimes refreshing the page loads it OK, mostly not. All of the pages work fine in JBoss 4.0.5.GA with MyFaces + Tomahawk. So I have removed JSF RI 1.2 from JBoss 4.2.0 and put MyFaces + Tomahawk in its place (not as trivial as it should be) - everything works fine. My understanding of Tomahawk is that it delegates ID generation to the JSF main implementation (MyFaces or JSF RI) - so there is probably a bug somewhere in the JSF RI. Dave View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046037#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...