Hibernate ApacheEmailValidator. Use instead of @pattern or @Email to let Apache Commons EmailValidator do the validation.

ApacheEmailValidator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

import org.apache.commons.lang.StringUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * Check a string if it's a valid eMail using {@see org.apache.commons.validator.routines.EmailValidator}
 * You need commons-validator-1.4 or later as a dependency.
 *
 * @author Robert Oschwald
 */
public class ApacheEmailValidator implements ConstraintValidator<EmailPattern, String> {

  /**
   * Initialize the validator in preparation for isValid calls.
   * The constraint annotation for a given constraint declaration
   * is passed.
   * <p/>
   * This method is guaranteed to be called before any use of this instance for
   * validation.
   *
   * @param annotation annotation instance for a given constraint declaration
   */
  public void initialize(EmailPattern annotation) {
  }

  /**
   * {@inheritDoc} check if given string is a valid mail.
   *
   * @see javax.validation.ConstraintValidator#isValid(java.lang.Object,
   *      javax.validation.ConstraintValidatorContext)
   */
  public boolean isValid(final String value, final ConstraintValidatorContext context) {
    if (StringUtils.isEmpty(value)) {
      return true;
    }
    return org.apache.commons.validator.routines.EmailValidator.getInstance().isValid(value);
  }
}

EmailPattern.java

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Email pattern check using Apache Commons EmailValidator
 * as the Hibernate EmailValidator is limited.
 *
 * The string has to be a well-formed email address.
 *
 * @author Robert Oschwald
 */
@Documented
@Constraint(validatedBy = ApacheEmailValidator.class)
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
public @interface EmailPattern {

  String message() default "{org.hibernate.validator.constraints.Email.message}";

	Class<?>[] groups() default { };

	Class<? extends Payload>[] payload() default { };
}