Spring's org.springframework.validation.Validator interface is used to validate objects. The Validator interface is very simple and works with Errors object.

Following two methods are provided by the Validator interface.

supports(Class) - indicates whether or not this validator supports the given object.

validate(Object, org.springframework.validation.Errors) - validates the given object and in case of validation errors, put those in the given Errors object.


This example will show the implementation of Validator interface.

Consider the following Company class.


public class Company {

  private String name;
  private int strength;

  public String getName() {
    return name;
  public void setName(String name) {
    this.name = name;
  public int getStrength() {
    return strength;
  public void setStrength(int strength) {
    this.strength = strength;

Following class CompanyValidator.java is the Validator for the Company.java class. It will validate the value of strength field from 0 to 100000.


 public class CompanyValidator implements Validator {

  public boolean supports(Class clazz) {
    return Company.class.equals(clazz);