<dependency> <groupId>org.jboss.errai.validation</groupId> <artifactId>errai-validation</artifactId> <version>3.0.0.Final</version> </dependency> public class Person { private String name; private int age; } Validator validator = Validation.buildDefaultValidatorFactory().getValidator(); Set<ConstraintViolation<Person>> violations = validator.validate(person); for (ConstraintViolation<Person> violation : violations) { System.out.println(violation.getMessage()); }