code: private void processFilePath(File file) {
          try {
              if (file.getCanonicalPath().toLowerCase().endsWith(".jar")
                      || file.getCanonicalPath().toLowerCase().endsWith(".zip")) {
  
                  ZipFile zip = new ZipFile(file);
                  Enumeration<? extends ZipEntry> entries = zip.entries();
  
                  while (entries.hasMoreElements()) {
                      ZipEntry entry = entries.nextElement();
  
                      if (entry.getName().endsWith("class")) {
                          InputStream zin = zip.getInputStream(entry);
                          tryClass(entry.getName().replace(File.separatorChar, '.').substring(0, entry.getName().length() - 6));
                          zin.close();
                      }
                  }
              }
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
docs: Finds and processes property files inside zip or jar files.
  
  @param file zip or jar file.