Thursday, 22 August 2013

Hibernate Custom validator to validate Multiple email ids

In my current project, i need to validate email ids where user will be enter more email id in one text area with semicolon as separator. Before storing into DB, i need to check whether all the email ids are valid one. So i decided to create custom Hibernate validator constraint. For more examples and understanding, please check here

package com.hibernate;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;

@Constraint(validatedBy = ValidateEmailValidator.class)
public @interface ValidateEmails {

String message() default "{default message}";

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

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


package com.hibernate;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

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

public class ValidateEmailValidator implements
ConstraintValidator<ValidateEmails, String> {

String emailPattern = ".+@.+\\.[a-z]+";
private final Pattern EMAIL_PATTERN = Pattern.compile(emailPattern);

public void initialize(ValidateEmails arg0) {


public boolean isValid(String value,
ConstraintValidatorContext constraintContext) {
if (value == null) {
return true;
boolean isValid = true;
String delimiter = ";";
String[] temp;
temp = value.split(delimiter);
for (int i = 0; i < temp.length; i++) {
if (validateEmail(temp[i]) == false) {
return false;
return isValid;

private boolean validateEmail(String email) {

return validatePattern(email, EMAIL_PATTERN);

private boolean validatePattern(String toBeValidated, Pattern pattern) {
if (toBeValidated == null)
return false;
Matcher m = pattern.matcher(toBeValidated);
return m.matches();

Example Usage:

@ValidateEmails(message = "Some email ids are invalid for Send result to email.")
private String resultEmails;

No comments:

Post a Comment

Passing Parameter between two files using MVVM

This examples shows how to pass parameter between two zul screens. In this example, we are passing some parameters from the parent vm to...