For the last couple of nights, I've been wresting with WebWork's validation framework and trying to get it's client-side stuff to work with AppFuse. After much frustration, I finally figured it was caused by the SpringObjectFactory class. By using this patch, I was able to get regular client-side validation to work, but not the VisitorFieldValidator - which is what I'm using for almost all validations.
Since I've been done with the WebWork integration into AppFuse for a few days now, I think it's time to cut my losses and start working on other stuff for the 1.6 release. Hopefully someone will figure this out someday, but in the meantime, the server-side validation should satisfy most requirements.
In other words: there will be no client-side validation for WebWork in AppFuse 1.6.
Update: After playing a bit more tonight, I almost added client-side validation by specifying the validation rules per-action rather than per-POJO. Then I discovered that the client-side validation has no way to cancel its invocation. With Commons Validation, you can add an onclick handler to a submit button (onclick="bCancel=true") to cancel client-side validation.