This is the first in a series of posts gathering together best practices and common approaches for developing applications using Seam, JSF, and RichFaces. This particular post will cover the Seam declarative exception handling feature.
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In practice, the classic JSF validation approach usually violates DRY (Don’t Repeat Yourself), since most “validation” actually enforces constraints that are part of the data model all the way down to the database schema definition. However, Seam provides support for model-based constraints defined using Hibernate Validator. Moreover, you can use Hibernate Validators for your bean together with the data model.
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