Spring-Security : Login with Ajax not working.

Question

I am working on a Spring-MVC project in which I have Spring-security for authentication and authorization. The login mechanism works by default, just that it redirects to another page for successful or denied login.

I wanted to make this with Ajax, so I referred to some posts on SO, and made some changes, unfortunately, it is not working.

security-applicationContext.xml :

 <security:http create-session="ifRequired" use-expressions="true" auto-config="false" disable-url-rewriting="true">
        <security:form-login login-page="/login" username-parameter="j_username" password-parameter="j_password"
                             login-processing-url="/j_spring_security_check" default-target-url="/dashboard"
                             always-use-default-target="true" authentication-failure-url="/denied"/>
        <security:remember-me key="_spring_security_remember_me" user-service-ref="userDetailsService"
                              token-validity-seconds="1209600" data-source-ref="dataSource"/>
        <security:logout delete-cookies="JSESSIONID" invalidate-session="true" logout-url="/j_spring_security_logout"/>
<!--            <security:intercept-url pattern="/**" requires-channel="https"/> -->
        <security:port-mappings>
            <security:port-mapping http="80" https="443"/>
        </security:port-mappings>
        <security:logout logout-url="/logout" logout-success-url="/" success-handler-ref="myLogoutHandler"/>

        <security:session-management session-fixation-protection="migrateSession">
            <security:concurrency-control session-registry-ref="sessionReg" max-sessions="5" expired-url="/login"/>
        </security:session-management>
    </security:http>

    <beans:bean id="sessionReg" class="org.springframework.security.core.session.SessionRegistryImpl"/>

    <beans:bean id="rememberMeAuthenticationProvider"
                class="org.springframework.security.web.authentication.rememberme.PersistentTokenBasedRememberMeServices">
        <beans:constructor-arg index="0" value="_spring_security_remember_me"/>
        <beans:constructor-arg index="1" ref="userDetailsService"/>
        <beans:constructor-arg index="2" ref="jdbcTokenRepository"/>
        <property name="alwaysRemember" value="true"/>
    </beans:bean>

    <beans:bean id="jdbcTokenRepository"
                class="org.springframework.security.web.authentication.rememberme.JdbcTokenRepositoryImpl">
        <beans:property name="createTableOnStartup" value="false"/>
        <beans:property name="dataSource" ref="dataSource"/>
    </beans:bean>

    <!-- Remember me ends here -->
    <security:authentication-manager alias="authenticationManager">
        <security:authentication-provider user-service-ref="LoginServiceImpl">
            <security:password-encoder ref="encoder"/>
        </security:authentication-provider>
    </security:authentication-manager>

    <beans:bean id="encoder"
                class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder">
        <beans:constructor-arg name="strength" value=""/>
    </beans:bean>

    <beans:bean id="daoAuthenticationProvider"
                class="org.springframework.security.authentication.dao.DaoAuthenticationProvider">
        <beans:property name="userDetailsService" ref="LoginServiceImpl"/>
        <beans:property name="passwordEncoder" ref="encoder"/>
    </beans:bean>
</beans>

AjaxAuthenticationSuccessHandler.java :

public class AjaxAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    private AuthenticationSuccessHandler defaultHandler;

    public AjaxAuthenticationSuccessHandler() {

    }
    public AjaxAuthenticationSuccessHandler(AuthenticationSuccessHandler defaultHandler) {
        this.defaultHandler = defaultHandler;
    }

    public void onAuthenticationSuccess(HttpServletRequest request,
                                        HttpServletResponse response, Authentication auth)
            throws IOException, ServletException {
        if ("true".equals(request.getHeader("X-Ajax-call"))) {
            response.getWriter().print("ok");
            response.getWriter().flush();
        } else {
            defaultHandler.onAuthenticationSuccess(request, response, auth);
        }
    }
}

Ajax code :

var form = $(this);
                       $.when(userController.login(form)).done(function(result){
   if(result == "ok"){
       window.location.href = "/dashboard";
 } else {
  alert("error");
  }
}).fail(function(response){
 alert("ups");
});

Method in usercontoller:

      this.login = function(form){
            return $.ajax({
            url: baseURL + '/j_spring_security_check',
            type: 'POST',
           data: form.serialize(),
            beforeSend: function(xhr){
                  xhr.setRequestHeader("X-Ajax-call", "true");
            }
            });
      };

I checked in firebug, username and password is sent correctly. Kindly let me know. Thank you.