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Asked: 2026-06-03T21:31:47+00:00

I have a problem with GWT client-side validation using hibernate validation annotation @Email. I

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I have a problem with GWT client-side validation using hibernate validation annotation @Email. I put this annotation on entity getter and when I check constrains violations (agfter I put this email: test@test), than I get an error message “not a well-formed email address”. But when I test this on server-side, than this email address pass. Have anyone of you this problem?

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  1. Editorial Team

    The EmailValidator implementation provided by Hibernate Validator uses java.util.regex.Pattern to validate input strings. Since GWT cross-compiles Java code to Javascript, it only supports JS-level RegEx and as such does not allow java.util.regex.Pattern to be used.

    As such, if you see the GWT re-implementation of EmailValidator, you’ll see that this validator in particular is not implemented/supported: http://grepcode.com/file/repo1.maven.org/maven2/com.google.gwt/gwt-user/2.4.0/org/hibernate/validator/constraints/impl/EmailValidator.java?av=h

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