code: public void stop(Path baseDir, Path sampleDir, ProcessExitCallback callback) {
          if (!sampleDir.toFile().exists() && callback != null) {
              callback.callback(0);
          }
  
          ProcessCommand cmd = MavenProject.load(baseDir).mvnw("jetty:stop", "-f",
                  sampleDir.toString());
          if (callback != null)
              cmd.getExitCallbacks().add(callback);
          cmd.executeAsync();
      }
docs: 次のコマンドを実行します。
  
  <pre>
  mvn jetty:stop
  </pre>