How to use the validate() method of a existing domain class

Hello,

I need to reuse some entities in my Grails app, they have a method called validate() that uses Hibernate Validator to do the validation. But when I call myEntity.validate() the result is true event when it should be false. I think grails is executing it's own validate(), how could I tell grails to not override existing methods?

Regards,
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Felipe Cypriano