Can you try that in your Seam component?
public void validateAttachment(FacesContext context,
UIComponent toValidate,
Object value) {
if (...check...) {
((UIInput)toValidate).setValid(false);
FacesMessage message = new FacesMessage("Invalid
Attachment");
context.addMessage(toValidate.getClientId(context),
message);
}
}
About JSF documentation I strongly recommend this
documentation that is really general with some example.
If it works I will add that into the answer documentation.
Or if someone else have a better answer :d
Regards
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