code: public static void initialize() {
      String homeDirName = System.getProperty("jdcp.home");
      File homeDir;
      if (homeDirName != null) {
        homeDir = new File(homeDirName);
      } else {
        homeDir = FileUtil.getApplicationDataDirectory("jdcp");
        System.setProperty("jdcp.home", homeDir.getPath());
      }
      homeDir.mkdir();
      if (System.getProperty("derby.system.home") == null) {
        System.setProperty("derby.system.home", homeDir.getPath());
      }
    }
docs: Performs initialization for the currently running JDCP
  application.