JPA unique constraint validation

How to validate Multiple column unique constraint in JPA entity. Is there any Hibernate validator for this purpose. I have added @UniqueConstraint annotation. But it is not doing any validation.And I开发者_运维技巧 also want to customize the error message.

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The @UniqueConstraint is not related to hibernate-validator. It cannot be handled by java-only validation, it needs a trip to the database.

It tells hibernate that the database has a unique constraint. If the database does not have a unique constraint, I think the insert should pass.