Bring jsp form page after previous submit (java spring)

Question

New to spring (and HTML/forms etc for that matter) and been stuck on this problem for long time.

So I want to have a front page where you enter a username. Then click submit, and takes you to a dashboard (ultimately, there will be a page with a list of connected users, a load of submit buttons to send predefined messages out - using qpid jms).

The front page is fine, but I click submit and I get an error (java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'dashboardModel' available as request attribute) This only happens if I have a form:form in dashboard.jsp. I literally have no idea how to fix this and have tried everything I can find. My code is simple, and is just modified from a tutorial, so here it is:

login.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
<title>Spring MVC Form Handling</title>
</head>
<body>
<h2>Login Page:</h2>
<form:form modelAttribute="loginModel" method="POST"
    action="/HelloWeb/dashboard">
    <table>
        <tr>
            <td><form:label path="username">Name</form:label></td>
            <td><form:input path="username" /></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="Submit" /></td>
        </tr>
    </table>
</form:form>
</body>
</html>

Login.java

package com.tutorialspoint;
public class Login {
private String username;

public String getUsername() {
    return username;
}

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

LoginController.java

package com.tutorialspoint;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
public class LoginController {

@RequestMapping(value = "/login", method = RequestMethod.GET)
public ModelAndView login() {
    return new ModelAndView("login", "loginModel", new Login());
}

@RequestMapping(value = "/loggedIn", method = RequestMethod.POST) //never actually used
public String loggedIn(@ModelAttribute("Login") Login login, ModelMap model) {
    model.addAttribute("username", login.getUsername());

    return "dashboard";
}
}

dashboard.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
<title>DASHBOARD</title>
</head>
<body>
<table>
    <tr>
        <td>Dashboard</td>
        <td>DASHBOARD</td>
    </tr>
    <tr>
        <td>Username</td>
        <td>${username}</td>
    </tr>
    <tr>
        <td>variable</td>
        <td>${variable}</td>
    </tr>
</table>

<form:form modelAttribute="dashboardModel" method="POST"
    action="/HelloWeb/dashboard">
    <table>
        <tr>
            <td><form:label path="variable">Name</form:label></td>
            <td><form:input path="variable" /></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="Submit" /></td>
        </tr>
    </table>
</form:form>
</body>
</html>

Dashboard.java

package com.tutorialspoint;

public class Dashboard {
private String variable;

public String getVariable() {
    return variable;
}
public void setVariable(String variable) {
    this.variable = variable;
}
}

DashboardController.java

package com.tutorialspoint;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
public class DashboardController {
@RequestMapping(value = "/dashboard", method = RequestMethod.GET)
public ModelAndView dashboard() {
    return new ModelAndView("dashboard", "dashboardModel", new Dashboard());
}

@RequestMapping(value = "/dashboard", method = RequestMethod.POST)
public String addVariable(@ModelAttribute("SpringWeb") Dashboard dashboard,
        ModelMap model) {
    model.addAttribute("variable", dashboard.getVariable());
    return "dashboard";
}
}

Thanks for your time.

Answer 1

I think the problem is here:

<form:form modelAttribute="loginModel" method="POST" action="/HelloWeb/dashboard">
                           ^^^^^^^^^^

and here:

@RequestMapping(value = "/loggedIn", method = RequestMethod.POST) //never actually used
public String loggedIn(@ModelAttribute("Login") Login login, ModelMap model) {
                                        ^^^^^

The modelAttribute value on form:form element and the @ModelAttribute argument should be the same.

I mean:

@RequestMapping(value = "/loggedIn", method = RequestMethod.POST) //never actually used
public String loggedIn(@ModelAttribute("loginModel") Login login, ModelMap model) {
                                        ^^^^^^^^^^

Edit:

Also, the form part should be like this:

<form:form modelAttribute="dashboardModel" method="POST" action="/loggedIn.htm">
   <table>
      <tr>
        <td>Name</td>
        <td><form:input path="username" /></td>
      </tr>
      <tr>
        <td colspan="2"><input type="submit" value="Submit" /></td>
      </tr>
   </table>
</form:form>

Bring jsp form page after previous submit (java spring)

Question

1 answers

solution1
0 2013-11-27 22:53:54

Bring jsp form page after previous submit (java spring)

Question

1 answers

solution1 0 2013-11-27 22:53:54

solution1
0 2013-11-27 22:53:54