I'm writing the Composite Components chapter for CJSF, and I hate to say: "Due to a bug in the reference implementation for JSF 2.0, the required attribute for composite components doesn't work." :( It would also be nice if we documented the repercussions for not supplying a required attribute. I filed a bug report on this awhile ago. It seems like some low-hanging fruit, as far as bugs go. Thanks, david