To bootstrap javax.validation.Validator you can simply use the following code:

final ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
final Validator validator = factory.getValidator();

For further information documentation see

• for version 5.1 http://docs.jboss.org/hibernate/validator/5.1/reference/en-US/html/chapter-bootstrapping.html#section-retrieving-validator-factory-validator
• for version 4.3 http://docs.jboss.org/hibernate/validator/4.3/reference/en-US/html/validator-bootstrapping.html#section-validator-instance