code: private FileNode moduleFile(URL url) {
          String module;
          int idx;
  
          module = url.getFile();
          module = Strings.removeLeft(module, "/");
          idx = module.indexOf("/");
          if (idx == -1) {
              throw new RuntimeException("unexpected jre url: " + url);
          }
          module = module.substring(0, idx);
          return file(System.getProperty("java.home")).join("jmods", module + ".jmod");
      }
docs: URI e.g. jre:/java.base/java/lang/Object.class