private void start() throws Exception {
    super.dbInit();
    SystemConfigsEntity entity =
        SystemConfigsDao.get()
            .selectOnKey(SystemConfig.DATA_EXPORT, AppConfig.get().getSystemName());
    if (entity == null) {
      send("[Fail] create fail. please try again.");
      return;
    }
    // エクスポートデータを格納するディレクトリ
    AppConfig config = AppConfig.get();
    File base = new File(config.getTmpPath());
    File dir = new File(base, DATA_DIR);
    if (dir.exists()) {
      FileUtil.delete(dir);
    }
    dir.mkdirs();
    File attach = new File(dir, "attach");
    attach.mkdirs();
    File userdir = new File(dir, "user");
    userdir.mkdirs();

    // ナレッジデータを取得
    LoginedUser loginedUser =
        new LoginedUser() {
          @Override
          public boolean isAdmin() {
            return true;
          }
        };
    KnowledgeLogic knowledgeLogic = KnowledgeLogic.get();
    CommentsDao commentsDao = CommentsDao.get();
    KnowledgeFilesDao knowledgeFilesDao = KnowledgeFilesDao.get();

    List<KnowledgesEntity> knowledges = knowledgeLogic.searchKnowledge("", loginedUser, 0, 100);
    for (KnowledgesEntity knowledgesEntity : knowledges) {
      File f =
          new File(
              dir,
              "knowledge-"
                  + StringUtils.zeroPadding(knowledgesEntity.getKnowledgeId(), 6)
                  + ".xml");
      String xml = SerializeUtils.objectToXml(knowledgesEntity);
      FileUtil.write(f, xml);

      // ナレッジのコメントを取得
      List<CommentsEntity> comments =
          commentsDao.selectOnKnowledgeId(knowledgesEntity.getKnowledgeId());
      for (CommentsEntity commentsEntity : comments) {
        File c =
            new File(
                dir,
                "comment-"
                    + StringUtils.zeroPadding(knowledgesEntity.getKnowledgeId(), 6)
                    + "-"
                    + StringUtils.zeroPadding(commentsEntity.getKnowledgeId(), 6)
                    + ".xml");
        xml = SerializeUtils.objectToXml(commentsEntity);
        FileUtil.write(c, xml);
      }
      List<KnowledgeFilesEntity> files =
          knowledgeFilesDao.selectOnKnowledgeId(knowledgesEntity.getKnowledgeId());
      for (KnowledgeFilesEntity knowledgeFilesEntity : files) {
        KnowledgeFilesEntity file = knowledgeFilesDao.selectOnKey(knowledgeFilesEntity.getFileNo());
        File a =
            new File(
                attach,
                "attach-"
                    + StringUtils.zeroPadding(knowledgesEntity.getKnowledgeId(), 6)
                    + "-"
                    + StringUtils.zeroPadding(knowledgeFilesEntity.getFileNo(), 6)
                    + knowledgeFilesEntity.getFileName());
        OutputStream outputStream = new FileOutputStream(a);
        InputStream inputStream = file.getFileBinary();
        try {
          FileUtil.copy(inputStream, outputStream);
        } finally {
          inputStream.close();
          outputStream.close();
        }
      }
      send("[Export] knowledge-" + knowledgesEntity.getKnowledgeId());
    }

    // ユーザ情報を取得
    UsersDao usersDao = UsersDao.get();
    List<UsersEntity> users = usersDao.selectAll();
    for (UsersEntity usersEntity : users) {
      ExportUser user = new ExportUser();
      PropertyUtil.copyPropertyValue(usersEntity, user);
      File f = new File(userdir, "user-" + StringUtils.zeroPadding(user.getUserId(), 6) + ".xml");
      String xml = SerializeUtils.objectToXml(user);
      FileUtil.write(f, xml);
      send("[Export] user-" + user.getUserId());
    }

    // zip圧縮
    send("[Export] during the compression");
    String name = DATA_DIR + ".zip";
    File comp = new File(base, name);

    BufferedOutputStream output = null;
    ZipArchiveOutputStream os = null;
    try {
      output = new BufferedOutputStream(new FileOutputStream(comp));
      os = new ZipArchiveOutputStream(output);
      os.setEncoding("UTF-8");
      CompressLogic.get().addZip(os, dir, null);
    } finally {
      if (os != null) {
        os.close();
      }
      if (output != null) {
        output.close();
      }
    }
    send("[Export] complete!");
    // 圧縮の予約を削除
    SystemConfigsDao.get().physicalDelete(entity);
  }