Spring Web MVC Application Cannot Find Resources - spring

Question

I am using netbeans as my IDE for developing basic web application. I successfully added external files as resources such as pictures and CSS files. They were working fine untill today, suddenly they are not being found by netbeans. Following is the error I am getting when debugging
Failed to load resource: the server responded with a status of 405 (Method not allowed).
Here is how I have initialized the MVC resources in XML config file.
<mvc:resources mapping="/resources/**" location="/resources/" cache-period="31556926"/>
<mvc:annotation-driven />
And here is how I am using it, in JSP file.
<link rel="stylesheet" href='<c:url value="/resources/css/bootstrap.min.css"/>'>
So what could be wrong. Why it has stopped suddenly ? Thanks for any pointer.
======== EDIT ===========
Here is my web.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/applicationContext.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
Following (already shown) two lines are in applicationContext.xml
<mvc:resources mapping="/resources/**" location="/resources/" cache-period="31556926"/>
<mvc:annotation-driven />
And here is my controller.
#RequestMapping(value = "/myURL", method=RequestMethod.GET)
public String MyControllerGET(HttpServletRequest request, Model model)
{
// some code here....nothing fancy, just harcoding some values
}