code: public static Collection<ZipEntry> getEntriesByExtension(File jar, String path, String extension)
      {
          Check.notNull(jar);
          Check.notNull(path);
          Check.notNull(extension);
  
          try (ZipFile zip = new ZipFile(jar))
          {
              return checkEntries(zip, path, extension);
          }
          catch (final IOException exception)
          {
              throw new LionEngineException(exception, ERROR_OPEN_ZIP + jar.getAbsolutePath());
          }
      }
docs: Get all entries existing in the path considering the extension.
  
  @param jar The JAR to check (must not be <code>null</code>).
  @param path The path to check (must not be <code>null</code>).
  @param extension The extension without dot; eg: xml (must not be <code>null</code>).
  @return The entries list.
  @throws LionEngineException If invalid arguments or unable to open ZIP.