code: public static void ensureOrGenerateSecret(MavenProject project, Log log) throws IOException {
          File conf = new File(project.getBasedir(), "src/main/configuration/application.conf");
          if (conf.isFile()) {
              List<String> lines = FileUtils.readLines(conf);
  
              boolean changed = false;
              for (int i = 0; i < lines.size(); i++) {
                  String line = lines.get(i);
                  Matcher matcher = OLD_SECRET_LINE_PATTERN.matcher(line);
                  if (matcher.matches()) {
                      if (matcher.group(1).length() == 0) {
                          lines.set(i, "application.secret=\"" + generate() + "\"");
                          changed = true;
                      }
                  } else {
                      matcher = SECRET_LINE_PATTERN.matcher(line);
                      if (matcher.matches()) {
                          if (matcher.group(2).trim().length() == 0) {
                              lines.set(i, "  secret = \"" + generate() + "\"");
                              changed = true;
                          }
                      }
                  }
  
              }
  
              if (changed) {
                  FileUtils.writeLines(conf, lines);
                  log.info("Application Secret generated - the configuration file was updated.");
              }
  
          }
      }
docs: Checks whether the application configuration file as the application secret.
  If not generates one.
  
  @param project the Maven Project
  @param log     the logger
  @throws java.io.IOException if the application file cannot be read, or rewritten