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JSR 303 cascade validation through inheritance 

Fang
Joined:
08/13/2009
Posts:
164

March 06, 2012 12:22:48    Last update: March 06, 2012 12:22:48
When a bean class inherits another class, the validation rules of the parent class is automatically executed when a child class bean is validated.

As an example, I create a class named AccountPerson, which inherits the Person class with the addition of an email field (src/main/java/com/example/AccountPerson.java in Maven project): 
package com.example;

import javax.validation.constraints.NotNull;

public class AccountPerson extends Person {
    @NotNull
    private String email;

    public AccountPerson(String name, String email) {
	super(name);
	this.email = email;
    }

    public String getEmail() {
	return this.email;
    }

    public void setEmail(String email) {
	this.email = email;
    }
}

Now validate AccountPerson with a JUnit test (src/test/java/com/example/AccountPersonTest.java in Maven project): 
package com.example;

import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;

public class AccountPersonTest {
    private Validator validator;

    @Before
    public void setUp() {
	ValidatorFactory f = Validation.buildDefaultValidatorFactory();
	validator = f.getValidator();
    }

    @Test
    public void testNameNull() {
	AccountPerson p = new AccountPerson(null, "a@b.com");
	Set<ConstraintViolation<AccountPerson>> violations = validator.validate(p);
	assertEquals(1, violations.size());
    }

    @Test
    public void testNameEmailNull() {
	AccountPerson p = new AccountPerson(null, null);
	Set<ConstraintViolation<AccountPerson>> violations = validator.validate(p);
	assertEquals(2, violations.size());
    }
}


Test with "mvn clean test" and you'll see that the validation rules of the Person class are executed when an AccountPerson bean is validated.
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