<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>

    <validator type="requiredstring">
        <param name="fieldname">userBean.username</param>
        <message>User name is required.</message>
    </validator>

    <validator type="required">
        <param name="fieldname">profileBean.Age</param>
        <message>Age is required.</message>
    </validator>

</validators>

<s:form action="register">

        <label>UserName</label>
        <s:textfield cssClass="formfield" name="userBean.username"
            label="User Name" />
        <br />
        <label>Password</label>
        <s:password cssClass="formfield" name="userBean.password"
            label="Password" />
        <br />
        <label>First Name</label>
        <s:textfield cssClass="formfield" name="profileBean.firstName"
            label="First Name" />
        <br />
        <label>Last Name</label>
        <s:textfield cssClass="formfield" name="profileBean.lastName"
            label="Last Name" />
        <br />
        <label>Age</label>
        <s:textfield cssClass="formfield" name="profileBean.age" label="Age" />
        <s:submit />
    </s:form>

struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <constant name="struts.devMode" value="false" />
    <constant name="struts.ui.theme" value="simple" />

    <package name="basicstruts2" namespace="/Welcome" extends="struts-default">
        <action name="index">
            <result>WEB-INF/index.jsp</result>
        </action>

        <action name="HelloWorld" class="actions.HelloWorldAction"
            method="execute">
            <result name="success">/HelloWorld.jsp</result>
        </action>
    </package>

    <package name="Registration" namespace="/" extends="struts-default">
        <action name="register" class="actions.Register"
            method="execute">
            <result name="success">/thankyou.jsp</result>
        </action>
    </package>
</struts>

package model;

public class Profile {
    private String firstName;
    private String lastName;
    private int age;

    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }



}

package model;

public class User {
    private String username;
    private String password;
    private int accountType;//Admin  - 0; User - 1;
    private Profile profile;

    public User(){
        accountType = 1;
    }


    public String getUsername() {
        return username;
    }


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


    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getAccountType() {
        return accountType;
    }
    public void setAccountType(int accountType) {
        this.accountType = accountType;
    }
    public Profile getProfile() {
        return profile;
    }

    public void setProfile(Profile profile) {
        this.profile = profile;
    }


}

public class Register extends ActionSupport  implements ServletRequestAware{

    public String execute(){

        userBean.setProfile(getProfileBean());
        return "success";
    }

    private User userBean;
    private Profile profileBean;
    HttpServletRequest request;

    public User getUserBean() {
        return userBean;
    }

    public void setUserBean(User userBean) {
        this.userBean = userBean;
    }

    public Profile getProfileBean() {
        return profileBean;
    }

    public void setProfileBean(Profile profileBean) {
        this.profileBean = profileBean;
    }

    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

    public HttpServletRequest getServletRequest() {
        return this.request;
    }
}

<package name="Registration" namespace="/" extends="struts-default">
        <action name="register" class="actions.Register"
            method="execute">
          <result name ="input">erropage.jsp</result>
          <result name="success">/thankyou.jsp</result>
        </action>
    </package>

<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"
    "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">

<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"
    "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>

    <validator type="requiredstring">
        <param name="fieldname">userBean.username</param>
        <message>User name is required.</message>
    </validator>

    <validator type="required">
        <param name="fieldname">profileBean.Age</param>
        <message>Age is required.</message>
    </validator>

</validators>

<validators>
      <field name="profileBean.age">
          <field-validator type="required">
              <message><![CDATA[ Age is required ]]></message>
          </field-validator>
      </field>

      <field name="userBean.username">
          <field-validator type="requiredstring">
              <message><![CDATA[ Username is required ]]></message>
          </field-validator>
      </field>
  </validators>

<s:form action="register">

<s:form action="/register">

<field name="userBean.username">
  <field-validator type="requiredstring">
    <message>User name is required.</message>
  </field-validator>
</field>