public static void sign(String token, Map<String, String> params) {
      List<String> list = new ArrayList();
      String tokenClientSlat = "";
-     for (String key : params.keySet()) {
+     for (Map.Entry<String, String> entry : params.entrySet()) {
+         String key = entry.getKey();
          if (key.equals("token_client_salt")) {
-             tokenClientSlat = params.get(key);
+             tokenClientSlat = entry.getValue();
          }
-         String paramString = key + "=" + params.get(key);
+         String paramString = key + "=" + entry.getValue();
          list.add(paramString);
      }
      Collections.sort(list);

          continue;
      } 
-     try {
-         JarFile nextJarFile = new JarFile(absNextFile);
-         try {
-             Attributes attrs = getMainAttrs(nextJarFile);
-             Set<Extension> newExtensions = getReferencedExtensions(attrs);
-             result.addAll(newExtensions);
-             filesToProcess.addAll(extensionsToFiles(newExtensions));
-         } finally {
-             nextJarFile.close();
-         }
+     try (JarFile nextJarFile = new JarFile(absNextFile)) {
+         Attributes attrs = getMainAttrs(nextJarFile);
+         Set<Extension> newExtensions = getReferencedExtensions(attrs);
+         result.addAll(newExtensions);
+         filesToProcess.addAll(extensionsToFiles(newExtensions));
      } catch (Exception e) {
          invalidLibPaths.append(nextFile.getPath()).append(" ");
      }

  private final Map<Class<?>, String> requestQueueNameCache = new ConcurrentHashMap<>();
     
  public String getRequestQueueName(Class<?> remoteInterface) {
-     String str = requestQueueNameCache.get(remoteInterface);
-     if (str == null) {
-         str = "{" + name + ":" + remoteInterface.getName() + "}";
-         requestQueueNameCache.put(remoteInterface, str);
-     }
-     return str;
+     return requestQueueNameCache.computeIfAbsent(remoteInterface, k -> "{" + name + ":" + k.getName() + "}");
  }

  @Override
  public List<SpoonFile> getAllJavaFiles() {
-     List<SpoonFile> result = new ArrayList<>();
-
-     for (SpoonFile f : getAllFiles()) {
-         if (f.isJava()) {
-             result.add(f);
-         }
-     }
-
-     return result;
+     return getAllFiles().stream().filter(SpoonFile::isJava).collect(Collectors.toList());
  }