struts2 validate a checkbox

[Bhaarat Sharma]

Hello

I am trying to validate a simple checkbox like this but it isnt happening at all

<s:checkbox name="privacyNow"/>
...
//action class
@Validation()
 
public class HelloWorldAction extends ActionSupport {
    
 
    private String name2;
    private String validator;
    
    @RequiredFieldValidator(message = "Please enter checkbox")
    public void setPrivacyNow(String s) { this.validator = s; }
    public String getPrivacyNow() {return this.validator;}
 
    @RequiredFieldValidator(message = "Please enter name")
    public void setName2(String s) { this.name2 = s; }
    public String getName2() { return this.name2; }
 
    public String execute() throws Exception {
     
        return SUCCESS;
    }

when validation errors are found the return statement will automatically be 'input' and i have configured that in my struts config file. The validation for the name field is happening fine and that is a <s:textfield tag. but for <s:checkbox it isnt working.

what is the way to validate a simple single checkbox