Problem with Relative Path (Spring Boot) in Extern Web Site

I have a problem with the path to load resources like css and js. My Spring Boot host 2 "web site", the first web site is in resources/public and its all ok, the second web site is out the project.

---

       |_Folder OUT The Project
         |_First Web Site
           |_css
             |_index.css
           |_js
             |_index.js
           |_index.html
         |_Second Web Site
       |_APP Spring Boot

---

This is the directory hierarchy. I use the optional configuration in spring to do all this.

@Configuration
@EnableWebMvc
public class StaticResourceConfiguration implements WebMvcConfigurer {

    private static final String INDEX = "classpath:/public/";
    private static final String FINAL = "file:./Folder OUT THE PROJECT/";

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations(INDEX);
        registry.addResourceHandler("/Folder OUT THE PROJECT /**").addResourceLocations(FINAL);
    }
}

If i go in localhost:8080/Folder OUT THE PROJECT/First Web Site/index.html, work. But index.html dont load /css/index.css and /js/index.js.

<link src="css/index.css" rel="stylesheet">
<script src="js/index.js"></script>

Because redirect to me in localhost:8080/js/index.js and same with css, localhost:8080/css/index.css, i dont know why, and i dont know how to fix. I cant know the name of the directories of the web sites in ("FOLDER OUT THE PROJECT"), because are generated by Spring .Jar (Generate Templates ... )

Thanks so much for your support.