This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Field validators are much convinient and allow us to group multiple validators to be applied to same field in one <field> element. Then what are the situations where non-field validators come in handy over field validators?