code: protected void loadClasses(Path pluginPath, PluginClassLoader pluginClassLoader) {
          for (String directory : pluginClasspath.getClassesDirectories()) {
              File file = pluginPath.resolve(directory).toFile();
              if (file.exists() && file.isDirectory()) {
                  pluginClassLoader.addFile(file);
              }
          }
      }
docs: Add all {@code *.class} files from {@code classes} directories to plugin class loader.