[jboss-user] [JBoss Seam] - validation

[minamti]

I have a field, which has an unique constraint in the database. I am getting an Hibernate UniqueConstraint exception. 

I would like to asynchronously query the database as the user is entering the form and inform that the entry violates the unique constraint. 

How can I write a validator in Seam that will be invoked by s:validate on the field. 

Any pointers would be helpful. 

Thanks, 

M

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