private void updateConfigFile() throws EnhancedException {

    // for SDK cobundles with JDK - see if cobundled JDK exists and use that
    // checks for jdk7 directory since we only have JDK 7 cobundles

    if (org.glassfish.installer.util.FileUtils.isFileExist(
        productRef.getInstallLocation() + File.separator + "jdk7")) {
      jdkHome = productRef.getInstallLocation() + File.separator + "jdk7";

      // on Unix, set executable permissions to jdk7/bin/* and jdk7/jre/bin/*
      if (!OSUtils.isWindows()) {
        org.glassfish.installer.util.FileUtils.setAllFilesExecutable(
            productRef.getInstallLocation() + File.separator + "jdk7" + File.separator + "bin");
        org.glassfish.installer.util.FileUtils.setAllFilesExecutable(
            productRef.getInstallLocation()
                + File.separator
                + "jdk7"
                + File.separator
                + "jre"
                + File.separator
                + "bin");
      }
    } else {

      // For all installation modes, fetch JAVA_HOME from panel;
      // on MacOS and AIX use java.home property since panel is skipped

      try {
        if (OSUtils.isMac() || OSUtils.isAix()) {
          jdkHome = System.getProperty("java.home");
        } else {
          jdkHome = ConfigHelper.getStringValue("JDKSelection.directory.SELECTED_JDK");
        }
      } catch (Exception e) {
        jdkHome = new File(System.getProperty("java.home")).getParent();
        if (OSUtils.isMac() || OSUtils.isAix()) {
          jdkHome = System.getProperty("java.home");
        }
      }
    }
    LOGGER.log(Level.INFO, Msg.get("UPDATE_CONFIG_HEADER", null));
    LOGGER.log(Level.INFO, Msg.get("JDK_HOME", new String[] {jdkHome}));
    // write jdkHome value to asenv.bat on Windows, asenv.conf on non-Windows platform...
    try {
      FileIOUtils configFile = new FileIOUtils();
      configFile.openFile(productRef.getConfigFilePath());
      /* Add AS_JAVA to end of buffer and file. */
      if (OSUtils.isWindows()) {
        configFile.appendLine("set AS_JAVA=" + jdkHome);
      } else {
        configFile.appendLine("AS_JAVA=" + jdkHome);
      }
      configFile.saveFile();
      configFile.closeFile();
    } catch (Exception ex) {
      LOGGER.log(Level.FINEST, ex.getMessage());
    }
  }
  /* Undo updatetool configuration and post-installation setups.*/
  public void unconfigureUpdatetool() throws Exception {
    /* Try to shutdown the notifer. Don't do this on Mac, the notifier command
    does not work on Mac, refer to Issue #7348. */
    if (!OSUtils.isMac() && !OSUtils.isAix()) {
      try {
        String shutdownCommand;
        if (OSUtils.isWindows()) {
          shutdownCommand = productRef.getInstallLocation() + "\\updatetool\\bin\\updatetool.exe";
        } else {
          shutdownCommand = productRef.getInstallLocation() + "/updatetool/bin/updatetool";
        }
        String[] shutdownCommandArray = {shutdownCommand, "--notifier", "--shutdown"};
        LOGGER.log(Level.INFO, Msg.get("SHUTDOWN_NOTIFIER", null));
        ExecuteCommand shutdownExecuteCommand = new ExecuteCommand(shutdownCommandArray);
        shutdownExecuteCommand.setOutputType(ExecuteCommand.ERRORS | ExecuteCommand.NORMAL);
        shutdownExecuteCommand.setCollectOutput(true);
        LOGGER.log(
            Level.FINEST,
            shutdownExecuteCommand.expandCommand(shutdownExecuteCommand.getCommand()));
        shutdownExecuteCommand.execute();
      } catch (Exception e) {
        LOGGER.log(Level.FINEST, e.getMessage());
        // Its okay to ignore this for now.
      }
    } /* End, conditional code for Mac and Aix. */

    /* Now unregister notifer. */
    try {
      String configCommand;
      if (OSUtils.isWindows()) {
        configCommand = productRef.getInstallLocation() + "\\updatetool\\bin\\updatetoolconfig.bat";
      } else {
        configCommand = productRef.getInstallLocation() + "/updatetool/bin/updatetoolconfig";
      }
      String[] configCommandArray = {configCommand, "--unregister"};
      LOGGER.log(Level.INFO, Msg.get("UNREGISTER_NOTIFIER", null));
      ExecuteCommand configExecuteCommand = new ExecuteCommand(configCommandArray);
      configExecuteCommand.setOutputType(ExecuteCommand.ERRORS | ExecuteCommand.NORMAL);
      configExecuteCommand.setCollectOutput(true);
      LOGGER.log(
          Level.FINEST, configExecuteCommand.expandCommand(configExecuteCommand.getCommand()));

      configExecuteCommand.execute();
    } catch (Exception e) {
      LOGGER.log(Level.FINEST, e.getMessage());
      // Its okay to ignore this for now.

    }
  }