pseudo code, not real

reload.java

public class Loader {
  public void load() {
      try {
          var path = Paths.get("scripts/java/");
          var urls = path.toUri().toURL();
          log.debug("Urls: {}", urls);
          clsLoader = new URLClassLoader(new URL[]{urls});

          Map<String, Class<MoeScript>> npcScripts = new HashMap<>();
          With.continueException(getAllClasses("moe.maple.scripts.npc"), name -> {
              processPkg(npcScripts, name);
          });
          // ... and so on, for every other package.
      } catch (Exception e) { 
          e.printStackTrace();
      }
  }

  private Collection<String> getAllClasses(String fullpkg, Path path) {
      var ret = new LinkedList<String>();

      var pkg = fullpkg+".";

      var dir = Paths.get(path.toString(), pkg.replace(".", "/")).toFile().listFiles();
      if (dir == null)
          return ret;

      With.continueException(dir, f -> {
          if (f.isDirectory()) {
              ret.addAll(getAllClasses(fullpkg+"."+f.getName(), path));
          } else {
              var name = pkg + (f.getName().replace(".class", ""));
              ret.add(name);
          }
      });

      return ret;
  }

  private Collection<String> getAllClasses(String fullpkg) {
      return getAllClasses(fullpkg, path);
  }

  private void processPkg(Map<String, Class<MoeScript>> map, String name) throws ClassNotFoundException {
      var cls = clsLoader.loadClass(name);

      var annotation = cls.getAnnotation(Script.class);
      if (annotation == null) return;
      if (annotation.name().isEmpty()) throw new IllegalArgumentException("Ehh, you forgot to set name, you idiot: "+name);
      map.put(annotation.name(), (Class<MoeScript>)cls);
  }
}