Spring 4 - addResourceHandlers not resolving the static resources

Question

My maven spring project directory structure is shown below. I am using Spring-4 annotation based configuration. I configure the resources like below. I tried many ways that are suggested in many Stackoverflow questions and other websites

Spring 4 loading static resources

http://imwill.com/spring-mvc-4-add-static-resources-by-annotation/#.U5GZlXKs9i4

But the jsp files could not load the resources, all the static content requests returns 404 error. I tried these things in jsp,

 <link href="resources/css/bootstrap.css" rel="stylesheet" media="screen">
 <link href="/resources/css/bootstrap.css" rel="stylesheet" media="screen">
 <link href="css/bootstrap.css" rel="stylesheet" media="screen">

EDIT: I am using servlet 2.5 because as of now I cannot upgrade my project from JBoss 5 to higher versions. JBoss5 do not support servlets 3, and do that matter?

@Configuration
@ComponentScan("com.mgage.mvoice")
public class MyAppWebConfig extends WebMvcConfigurerAdapter {
     public void addResourceHandlers(ResourceHandlerRegistry registry) {  
        // I tried these many combinations separately.

        ResourceHandlerRegistration resourceRegistration = registry
            .addResourceHandler("resources/**");
        resourceRegistration.addResourceLocations("/resources/**");
        registry.addResourceHandler("/css/**").addResourceLocations("/css/**");
        registry.addResourceHandler("/img/**").addResourceLocations("/img/**");
        registry.addResourceHandler("/js/**").addResourceLocations("/js/**");
        registry.addResourceHandler("/resources/**")
                .addResourceLocations("classpath:/resources/"); 
              // do the classpath works with the directory under webapp?
     }

}

Answer 1

this worked,

   registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");

and in the jsp files I referred to the static resources like

<link href="resources/css/bootstrap.css" rel="stylesheet" media="screen">