JSF passes validation on a constraint but Hibernate fails

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Issue

We have a @Length(min = 2, max=50) constraint on our entity. Inputing an empty string into our <h:inputText> passes validation on the JSF side but then Hibernate throws a validation error. Why wouldn't JSF throw a validation error initially?

Environment

JBoss Enterprise Application Platform (EAP) 5.1
Seam 2.2

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