[JSP] Struts ed errore "Error creating bean..."

[gbattine]

Questo è il mio LoginForm.java.....come devo modificarlo?
Dimmi passo passo perchè non ho ancora le idee molto chiare....
Grazie




package spectra.Form;
import javax.servlet.http.HttpServletRequest;


import org.apache.struts.action.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

public class LoginForm extends org.apache.struts.action.ActionForm {


private String password;
private String username;

public LoginForm () {
}

//setter method
public void setPassword (String password) {
this.password = password;
}

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

//getter method
public String getPassword () {
return this.password;
}

public String getUsername () {
return this.username;
}

public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
{
ActionErrors errors = new ActionErrors();

if((username == null) || (username.length() < 1))
errors.add("username", new ActionError("error.username.required"));
if((password == null) || (password.length() < 1))
errors.add("password", new ActionError("error.password.required"));

return errors;

}
}