que in spring mvc - simpleformcontroller

hi,

i am a newbie to spring..

i am trying to display a jsp page from simpleformcontroller & if user enters invalid data, the same jsp should be displayed with a error message.

when i enter invalid data & click on submit am getting :
SEVERE: Neither BindingResult nor plain target object for bean name 'LoginCommand' available as request attribute
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'LoginCommand' available as request attribute

Btw, successView is working fine...

can someone please help ?
Login.jsp

LoginController.java

package javafiles;

import javax.swing.text.View;

import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class LoginController extends SimpleFormController {

LoginController() {
		setCommandClass(LoginCommand.class);
		setCommandName("LoginCommand");
	}

@Override
	protected ModelAndView onSubmit(Object command) throws Exception {

LoginCommand loginCmd = (LoginCommand) command;
		XmlBeanFactory beanFact = new XmlBeanFactory(new ClassPathResource(
		"applicationContext.xml"));
		LoginVerify verify = (LoginVerify) beanFact.getBean("verifyBean");
		boolean isValid = verify.verifyLogin(loginCmd.getUsername(), loginCmd
				.getPassword());

ModelAndView view = null;
		if (isValid) {
			view = new ModelAndView(getSuccessView());
		} else {
			view = new ModelAndView("Login", "invalidLoginMessage",
			"Invalid Login...");
		}
		return view;
	}
}

SpringTask1-servlet.xml

This is not a right way to do. You should implement a Validator and inject it to the Controller.
http://static.springsource.org/spring/docs/2.5.x/reference/validation.html

You have to use the errors tag too.
http://static.springsource.org/spring/docs/2.5.6/reference/spring-form.tld.html#spring-form.tld.errors