You could write a validator for this @Name("uniqueValidator") | @Validator | @Transactional | public class UniqueValidator { | | @In EntityManager entityManager; | | public void validate(FacesContext facesContext, UIComponent component, Object value) | throws ValidatorException { | Foo foo = (Foo) value; | Foo foo1 = entityManager.createQuery("select f from Foo f where f.uniqueProperty = :uniqueProperty").setParameter("uniqueProperty, foo.getUniqueProperty()).getSingleResult(); | if (foo1 != null && !foo1.getId().equals(foo.getId)) { | throw new ValidatorException("Unique Constraint Violation"); | } | } | } In fact, we could have a generic version of this in Seam as part of s:validate. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059691#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...