//Set bean in first method /login/form
//Then call different method on form submit /login/submit
@Controller
@RequestMapping(value="/login")
public class LoginController
{
  @RequestMapping(value="/form")
  protected ModelAndView loginformHandler
  (@ModelAttribute("command") LoginCommand command)
  throws Exception
  {
    ModelAndView mav = new ModelAndView();
    mav.setViewName("login");
    //set to blank
    command.setUserId("");
    command.setPassword("");
    mav.addObject(command);

//IN JSP ACCESS THIS BEAN
<form:form commandName="command" action="/Spring3App/login/submit">
  <form:input path="userId" />
</form:form>

//Override method formBackingObject to set form to default
@Override formBackingObject in your controller
protected Object formBackingObject(HttpServletRequest request)
throws Exception

//on form submit method onSubmit() will be called
@Override
protected ModelAndView onSubmit
(HttpServletRequest request,
HttpServletResponse response,
Object bean,
BindException errors)

//IN JSP ACCESS THIS BEAN
<form:form commandName="command" action="/Spring2App/login/">
  <form:input path="userId" />
</form:form>

//Override method input to set form to default
  public String input() throws Exception {
    loginBean.setUserId("");
    loginBean.setPassword("");
    return INPUT;
  }

//Override method execute for form submission
  public String execute() throws Exception {
    return SUCCESS;
  }

//In servlet set bean in request as per some request parameter
public class MyServlet extends HttpServlet {

  public void doGet(HttpServletRequest request,
  HttpServletResponse response)
  throws javax.servlet.ServletException,
  java.io.IOException
  {
    process(request, response);
  }

  public void doPost(HttpServletRequest request,
  HttpServletResponse response)
  throws javax.servlet.ServletException,
  java.io.IOException
  {
    process(request, response);
  }

  public void process(HttpServletRequest request,
  HttpServletResponse response)
  throws javax.servlet.ServletException,
  java.io.IOException
  {
	String act = request.getParameter("act");
	if(act == null)
	{
		//set form bean to default
		LoginBean loginBean = new LoginBean();
		loginBean.setUserId("");
		loginBean.setPassword("");
		request.setAttribute("loginBean",loginBean);
	}
	else if(act.equals("submit"))
	{
		//do form processing
	}

//now in JSP use jsp:useBean tag

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