public static void main(String[] args) {
    // Ensure to have all necessary drivers installed !
    try {
      Driver d = (Driver) (Class.forName("oracle.jdbc.driver.OracleDriver").newInstance());
      DriverManager.registerDriver(d);
    } catch (Exception e) {
    }

    // Set the priority which messages have to be logged
    cat.setPriority(Priority.INFO);

    // Configuration with configuration-file
    PropertyConfigurator.configure("log4jtestprops.txt");

    // These messages with Priority >= setted priority will be logged to the database.
    cat.debug("debug"); // this not, because Priority DEBUG is less than INFO
    cat.info("info");
    cat.error("error");
    cat.fatal("fatal");
  }