Struts 2 XML Validation Example

Struts 2 XML Validation Example explains about step by step example of Struts2 XML Validation With Eclipse

Apache Struts 2, is a popular Java Model-View-Contraller (MVC) framework, which is developed by merging WebWork and Struts 1.x web frameworks.

Struts 2 have lot off difference with struts 1, struts 2 have implemented with an idea of convention over configuration, it also have many annotations in order to increase the developer productivity.

Struts 2 provides in built validation features. You can see how to validate the fields in struts 2, on below example


When you deploy your struts 2 web application, you may get FilterDispatcher is deprecated! Please use the new filters! warning message, this is because FilterDispatcher filter is deprecated since Struts version 2.1.3, you need to re-configure your application with StrutsPrepareAndExecuteFilter

Required Libraries
  1. JDK 6
  2. Eclipse 3.7
  3. struts-

Following jar must be in classpath

  1. commons-fileupload-1.3.jar
  2. commons-io-2.0.1.jar
  3. commons-lang3-3.1.jar
  4. commons-logging-1.1.3.jar
  5. freemarker-2.3.19.jar
  6. javassist-3.11.0.GA.jar
  7. ognl-3.0.6.jar
  8. struts2-core-
  9. xwork-core-

You can see the project structure below

Struts 2 XML Validation Example


<%@taglib uri="/struts-tags" prefix="s"%>
<s:head />
	<s:form action="register" method="post">
		<s:textfield name="username" label="User Name" />
		<s:textfield name="age" label="Age" />
		<s:password name="password" label="Password" />
		<s:submit value="register" />


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>
        <h1>Register Success</h1>

Here is the action class, We are using Struts in built custom validate() method and throwing addFieldError()

package net.javatips;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {

private static final long serialVersionUID = 1L;
private String username;
private Integer age;
private String password;

public String execute() {
return "success";

public String getUsername() {
return username;

public void setUsername(String username) {
this.username = username;

public Integer getAge() {
return age;

public void setAge(Integer age) {
this.age = age;

public String getPassword() {
return password;

public void setPassword(String password) {
this.password = password;


Our Action class name is RegisterAction, so struts2 validation.xml name must be RegisterAction-validation.xml (ie; append -validation with action class)

<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"
	<field name="username">
		<field-validator type="requiredstring">
			<param name="trim">true</param>
			<message key="errors.required" />
	<field name="age">
		<field-validator type="required">
			<message key="errors.required" />
		<field-validator type="int">
			<param name="min">1</param>
			<param name="max">100</param>
			<message key="errors.range" />
	<field name="password">
		<field-validator type="requiredstring">
			<param name="trim">true</param>
			<message key="errors.required" />

errors.invalid=${getText(fieldName)} is invalid.
errors.required=${getText(fieldName)} is required.
errors.number=${getText(fieldName)} must be a number.
errors.range=${getText(fieldName)} is not in the range ${min} and ${max}.


Following is the struts 2 configuration, which will used for naviagating different page views

The name of this configuration file should be "struts.xml"

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
	<package name="default" extends="struts-default">
		<action name="register" class="net.javatips.RegisterAction">
			<result name="success">RegisterSuccess.jsp</result>
			<result name="input">Register.jsp</result>


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi=""
	xmlns="" xmlns:web=""

You need to invoke http://localhost:8080/Struts2Validation/Register.jsp

Struts 2 Validation Example

Struts 2 Validation Example

Struts 2 Validation Example

Struts 2 Validation Example

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