docs: private void appendExcludesListToExcludesFile(Plugin plugin, List<String> nonAffectedClasses) throws MojoExecutionException {
          String excludesFileName = extractParamValue(plugin, EXCLUDES_FILE_PARAM_NAME);
          File excludesFileFile = new File(excludesFileName);
  
          // First restore file in case it has been modified by this
          // plugin before (if 'restore' was not run, or VM crashed).
          restoreExcludesFile(plugin);
  
          PrintWriter pw = null;
          try {
              // Have to restore original file (on shutdown); see
              // RestoreMojo.
              pw = new PrintWriter(new FileOutputStream(excludesFileFile, true), true);
              pw.println(EKSTAZI_LINE_MARKER);
              for (String exclude : nonAffectedClasses) {
                  pw.println(exclude);
              }
              // If "exclude(s)" is not present, we also have to add default value to exclude inner classes.
              if (!isAtLeastOneExcludePresent(plugin)) {
                  pw.println("**/*$*");
              }
          } catch (IOException ex) {
              throw new MojoExecutionException("Could not access excludesFile", ex);
          } finally {
              if (pw != null) {
                  pw.close();
              }
          }
      }