code: private List<String> getSchemaStringsFromJar(String jarPath,
        String directoryPath) {
      LOG.info("Getting schema strings in: " + directoryPath + ", from jar: "
          + jarPath);
      JarFile jar;
      try {
        jar = new JarFile(URLDecoder.decode(jarPath, "UTF-8"));
      } catch (UnsupportedEncodingException e) {
        throw new DatasetException(e);
      } catch (IOException e) {
        throw new DatasetException(e);
      }
      Enumeration<JarEntry> entries = jar.entries();
      List<String> schemaStrings = new ArrayList<String>();
      while (entries.hasMoreElements()) {
        JarEntry jarEntry = entries.nextElement();
        if (jarEntry.getName().startsWith(directoryPath)
            && jarEntry.getName().endsWith(".avsc")) {
          LOG.info("Found schema: " + jarEntry.getName());
          InputStream inputStream;
          try {
            inputStream = jar.getInputStream(jarEntry);
          } catch (IOException e) {
            throw new DatasetException(e);
          }
          String schemaString = AvroUtils.inputStreamToString(inputStream);
          schemaStrings.add(schemaString);
        }
      }
      return schemaStrings;
    }
docs: Gets the list of HBase Common Avro schema strings from a directory in the
  Jar. It recursively searches the directory in the jar to find files that
  end in .avsc to locate thos strings.
  
  @param jarPath
  The path to the jar to search
  @param directoryPath
  The directory in the jar to find avro schema strings
  @return The list of schema strings.