Controller part of Spring Security - spring

Question

I have created a custom authentication service for spring-security by implementing the interface UserDetailsService, which is refereed in a security-context.xml as a bean so it will be loaded when application starts. Currently the situation is, I have a LoginController with mapping to bean, a service which calls a method in DAO for checking if the username and password is correct. I just don't know what should come under controller. I am posting the code below. Kindly let me know what am I missing in controller. Thank you for your time.
LoginController.java :
#Controller
#RequestMapping(value = "/login",method = RequestMethod.GET)
public class LoginController {
#Resource(name="userDetailsService")
private LoginService loginService;
}
LoginService.java
#Transactional
#Service("userDetailsService")
#RequestMapping("")
public class LoginService implements UserDetailsService{
#Autowired private UserDao userDao;
#Autowired private Assembler assembler;
#Override
#Transactional
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserDetails userDetails = null;
User user = userDao.findByName(username);
if(user == null) { throw new UsernameNotFoundException("Wrong username or password");}
return assembler.buildUserFromUserEntity(user);
}
}
Security-applicationContext.xml
<import resource="servlet-context.xml" />
<!-- Global Security settings -->
<security:global-method-security pre-post-annotations="enabled" />
<!-- Spring Security framework settings -->
<security:http use-expressions="true" auto-config="false" access-denied-page="/403" disable-url-rewriting="true">
<security:session-management>
<security:concurrency-control max-sessions="3" error-if-maximum-exceeded="true"/>
</security:session-management>
<security:form-login login-page="/users" default-target-url="/users" always-use-default-target="true"
authentication-failure-url="/denied" username-parameter="username" password-parameter="password" />
<security:logout logout-url="/logout" logout-success-url="/login?out=1" delete-cookies="JSESSIONID" invalidate-session="true" />
<security:intercept-url pattern="/*" requires-channel="any" access="permitAll" />
<security:intercept-url requires-channel="any" pattern="/login*" access="permitAll"/>
<security:intercept-url pattern="/**" requires-channel="any" access="hasRole('ROLE_USER')" />
</security:http>
<!-- queries to be run on data -->
<security:authentication-manager alias="authenticationManager" >
<security:authentication-provider user-service-ref="userDetailsService" />
</security:authentication-manager>
</beans>
Servlet-context.xml
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<!-- Enables the Spring MVC #Controller programming model -->
<resources mapping="/resources/**" location="/resources/" />
<!-- beans start here -->
<beans:bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp"/>
</beans:bean>
<context:component-scan base-package="com.WirTauschen"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
Login form HTML code
**<form id="form" action="<c:url value='/login'/>" method="POST">
<div class="box-wrapper">
<h4>LOGIN</h4>
<div class="iconic-input">
<input type="text" placeholder="Username" name="j_username" value="">
<i class="icons icon-user-3"></i>
</div>
<div class="iconic-input">
<input type="password" placeholder="Password" name="j_password" value="">
<i class="icons icon-lock"></i>
</div>
<input type="checkbox" id="loginremember"> <label for="loginremember">Remember me</label>
<br>
<br>
<div class="pull-left">
<input name="submit" type="submit" class="orange" value="Login">
</div>
<div class="pull-right">
Forgot your password?
<br>
Forgot your username?
<br>
</div>
<br class="clearfix">
</div>
<div class="footer">
<h4 class="pull-left">NEW CUSTOMER?</h4>
<a class="button pull-right" href="create_an_account.html">Create an account</a>
</div>
</form>
</li>
</ul>
</li>
<li><i class="icons icon-lock"></i> Create an Account</li>
</ul>
</nav>