code: public Result serveStatic() {
          Object renderable = new Renderable() {
              @Override
              public void render(Context context, Result result) {
                  String fileName = getFileNameFromPathOrReturnRequestPath(context);
                  URL url = getStaticFileFromAssetsDir(fileName);
                  streamOutUrlEntity(url, context, result);
              }
          };
          return Results.ok().render(renderable);
      }
docs: Serves resources from the assets directory of your application.
  
  For instance:
  route: /robots.txt
  A request to /robots.txt will be served from /assets/robots.txt.
  
  You can also use a path like the following to serve files:
  route: /assets/{fileName: .*}
  
  matches
  /assets/app/app.css
  and will return
  /assets/app/app.css (from your jar).