private static void usage(String s) {
    err.println("\n** " + s + "\n");
    err.println("usage: java GenerateMBeanHTML xmlFile htmlFile");
    err.println();
    err.println("Converts an MBeans description XML file into an HTML");
    err.println("file suitable for documentation");

    err.println();

    ExitCode.FATAL.doSystemExit();
  }
Prints usage information about this program
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/GenerateMBeanHTML.java