thank your reply. I traced the Seam 2.0 source and myfaces 1.2 source.And I Found that problem caused by myface 1.2 bug. In PropertyResolverToELResolver.java: private T invoke(ELContext context, Object base, Object property, ResolverInvoker invoker) myfaces set context.setPropertyResolved(true); but In PropertyResolverToELResolver.java: public Object getValue(ELContext context, Object base, Object property) myfaces return null, that cause the model validation failed View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085924#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...