Struts Validation Not Working [strange] - struts2

Question

I think I get a strange condition in struts validation, because sometimes it works and sometimes do not work. I using maven. On the first install, i get it work. But after maven clean, it never work again.
When I install my project (maven install), xml validation (CustomerAction-validation.xml) is not copied to action class package in the target folder. I don't know why.
It will error if I remove <interceptor-ref name="prepare"/> in "customer-form" action. Although I use default-interceptor. No customization.
Other question about login form (unrelated to validation). How to post the form to another namespace. I try by using namespace="/web", but it not work. That's why i try by using s:url, but it make i can't use s:form
This is my project structure
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>struts.test</groupId>
<artifactId>validation</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>validation Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<junit.version>3.8.1</junit.version>
<struts2.version>2.3.1.2</struts2.version>
<struts2-tiles-plugin.version>2.3.14</struts2-tiles-plugin.version>
<tiles.version>2.0.7</tiles.version>
<commons-logging.version>1.1.3</commons-logging.version>
<commons-collection.version>3.2.1</commons-collection.version>
<xwork.version>2.1.3</xwork.version>
<dojo.version>2.1.8</dojo.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Struts 2 -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>${struts2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-tiles-plugin</artifactId>
<version>${struts2-tiles-plugin.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-api</artifactId>
<version>${tiles.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-core</artifactId>
<version>${tiles.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-jsp</artifactId>
<version>${tiles.version}</version>
</dependency>
<!-- Struts 2 Dojo Ajax Tags -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-dojo-plugin</artifactId>
<version>${dojo.version}</version>
</dependency>
<!-- Struts 2 JSON Plugins -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-json-plugin</artifactId>
<version>${dojo.version}</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>${commons-logging.version}</version>
</dependency>
<dependency>
<groupId>com.opensymphony</groupId>
<artifactId>xwork</artifactId>
<version>${xwork.version}</version>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.19</version>
</dependency>
<dependency>
<groupId>ognl</groupId>
<artifactId>ognl</artifactId>
<version>3.0.6</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
<version>2.1</version>
</dependency>
</dependencies>
<build>
<finalName>validation</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="false" />
<constant name="struts.custom.i18n.resources" value="ApplicationResources" />
<package name="default" extends="struts-default" namespace="/web">
<result-types>
<result-type name="tiles"
class="org.apache.struts2.views.tiles.TilesResult" />
</result-types>
<action name="login" class="struts.test.validation.action.LoginAction">
<result name="success" type="tiles">/welcome.tiles</result>
<result name="error">Login.jsp</result>
</action>
<action name="savecustomer" class="struts.test.validation.action.CustomerAction" method="saveCustomer">
<result name="success" type="tiles">/customer.success.tiles</result>
<result name="input" type="tiles">/customer.tiles</result>
</action>
<action name="customer-form" class="struts.test.validation.action.CustomerAction" method="addCustomer">
<interceptor-ref name="prepare"/>
<result name="success" type="tiles">/customer.tiles</result>
<result name="input" type="tiles">/customer.tiles</result>
</action>
</package>
</struts>
CustomerAction-validation.xml
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
<field name="customer.name">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message key="errors.required" />
</field-validator>
</field>
<field name="customer.email">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message key="errors.required" />
</field-validator>
</field>
<field name="customer.type">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message key="errors.required" />
</field-validator>
</field>
</validators>
CustomerAction class
public class CustomerAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private CustomerDto customer;
private List<String > listCustoType;
public String addCustomer(){
listCustoType = new ArrayList<String>();
listCustoType.add("Type1");
listCustoType.add("Type2");
return SUCCESS;
}
public String saveCustomer() {
System.out.println(customer.getName()+" "+customer.getEmail());
return SUCCESS;
}
public CustomerDto getCustomer() {
return customer;
}
public void setCustomer(CustomerDto customer) {
this.customer = customer;
}
public List<String> getListCustoType() {
return listCustoType;
}
public void setListCustoType(List<String> listCustoType) {
this.listCustoType = listCustoType;
}
}
CustomerDto class
public class CustomerDto {
private Integer id;
private String name;
private String email;
private String type;
//getter & setter
Customer Form
<%# page contentType="text/html; charset=UTF-8"%>
<%# taglib prefix="s" uri="/struts-tags"%>
<html>
<body>
<h2>Customer Form</h2>
<s:form action="savecustomer" method="post" validate="true" namespace="/web">
<s:select
label="Customer Type"
list="listCustoType"
name="customer.type"
headerKey="-1"
headerValue=""/>
<s:textfield name="customer.name" key="customer.name" size="20" />
<s:textfield name="customer.email" key="email" size="20" />
<s:submit method="addCustomer" key="label.add.customer" align="center" />
</s:form>
</body>
</html>
Login form
<form action='<s:url value='/'/>web/login' method="post">
<s:textfield name="username" key="label.username" size="20" />
<s:password name="password" key="label.password" size="20" />
<s:submit method="execute" key="label.login" align="center" />
</form>
My complete project I uploaded here

Answer 1

In Maven projects, non-Java artifacts intended to be deployed on the classpath need to be in:
src/main/resources
Because you've placed them in the Java source directory tree they will not be deployed.
In your specific case:
src/main/resources/struts/test/validation/action/CustomerValidation-validation.xml
This is the same pattern as the other XML files in the resources directory, deployed to the classpath.

Answer 2

Just ran into the problem where my validation files were not copying over. To fix this problem, you need to add in the maven-war-plugin and configure it properly to include the XML files. Here is what I added to my pom.xml file to get it working in my project:
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<webResources>
<resource>
<!-- this is relative to the pom.xml directory -->
<directory>src/main/java/com/project/controller/</directory>
<targetPath>WEB-INF/classes/com/project/controller/</targetPath>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</webResources>
</configuration>
</plugin>
</plugins>
</build>
You can read up more on how the maven-war-plugin works here.