Q:

Spring MVC mapping - why path is changing?

I have this piece of code:
    @RequestMapping(value="login/authUser", method=RequestMethod.POST)
public String authUser(@RequestParam("login") String login,
                        @RequestParam("password") String password, ModelMap model)
(...)

Which should catch user's authentication:
<div id ="loginBar">
        <form id="loginForm" action="login/authUser" method="post">
            <label>Login:</label>
            <input id="login" type="text" title="podaj login" name="login"/><br><br>
            <label>Hasło:</label>
            <input id ="password" type="password" title="podaj haslo, minimum 8 znaków" name="password"><br>
            <input id ="loginAuthorisationFailed" type="text"/><br>
            <input id="loginButton" type="submit" value="Zaloguj"><br>
        </form>
    </div>

And if it's bad, it should return index.jsp and information about bad data
(...)
else{
            model.put("info", "Bad data!");
            return "index";

Info goes to the h1 HTML tag:
 <h1>${info}</h1>

And this is path then I see in browser:
http://localhost:8084/pracainz/login/authUser

But then I try to log again, path in browser is different:
http://localhost:8084/pracainz/login/login/authUser

and Tomcat shows me error:
The requested resource () is not available.

It adds extra "/login" and I don't know why. What can I do to stop form behaving in this way, what can I do to force ,,reset" of path every time when I try to send form to Spring?
Unfortunately, this is not working:
action="${pageContext.servletContext.contextPath}/login/authUser"

I would be very happy if anybody want to help me.
Thank you in advance!
SOLVED:
Solution:
I should use:
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
(...)

<form:form id="loginForm" action="${pageContext.servletContext.contextPath}/login/authUser" method="post">
 (...)
</form:form>

Instead simple  HTML tag

A:

Use the Spring tag library and more specifically spring:url to create the correct url for action. Check out this SO question for details

