The @Required annotation is used to make sure a particular property has been set. If you are migrate your existing project to Spring framework or have your own @Required-style annotation for whatever reasons, Spring is allow you to define your custom @Required-style annotation, which is equivalent to @Required annotation.

In this example, you will create a custom @Required-style annotation named @Mandatory, which is equivalent to @Required annotation.

1. Create the @Mandatory interface

package com.mkyong.common;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

public @interface Mandatory {

2. Apply it to a property

package com.mkyong.common;

public class Customer 
	private Person person;
	private int type;
	private String action;
	public void setPerson(Person person) {
		this.person = person;
	//getter and setter methods

3. Register it

Include your new @Mandatory annotation in ‘RequiredAnnotationBeanPostProcessor’ class.

<beans xmlns=""

	<property name="requiredAnnotationType" value="com.mkyong.common.Mandatory"/>
	<bean id="CustomerBean" class="com.mkyong.common.Customer">
		<property name="action" value="buy" />
		<property name="type" value="1" />

4. Done

Done, you just created a new custom @Required-style annotation named @Mandatory, which is equivalent to @Required annotation.