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Pop up error while using validation in struts2.0

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I have wriiten a small application using struts 2.0...and then i have tried to implement validation in it.I have given 2 input fields, and when i click on submit without entereing in one of the fields or both, i get a pop-up stating that [object-error].

Kindly, help me out in this...the code is given below...
Thanks in advance.


<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"/>


<s:form action="loginAction" validate="true">

Username: <s:textfield name="username"/>
Password: <s assword name="password"/>

<s:submit value="submit"/>



<field name="username">

<field-validator type="required">
<param name="fieldName">username</param>

<!--<param name="trim">true</param>-->

<message>Login name is required</message>



<field name="password">

<field-validator type="requiredstring">

<!--<param name="trim">true</param>-->

<message>Password is required</message>





public class loginAction extends ActionSupport{

String username;
String password;
public String execute()throws Exception{

System.out.println("Validating login");
if(!getUsername().equals("Admin") || !getPassword().equals("Admin")){
addActionError("Invalid user name or password! Please try again!");
return "ERROR";
return "SUCCESS";


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

public String getUsername() {
return username;

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

public String getPassword() {
return password;

does anyone to solve it....
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