Как объединить два .jar

#!/bin/sh

java -jar 1.jar &
java -jar 2.jar &

  URL[] repositoryJars = walkRepository (repository, new URL[] { new File(System.getProperty("user.dir")).toURI ().toURL ()});
  ClassLoader currentThreadClassLoader = Thread.currentThread().getContextClassLoader();
  URLClassLoader urlClassLoader = new URLClassLoader(repositoryJars, currentThreadClassLoader);
  Thread.currentThread().setContextClassLoader(urlClassLoader);

  public static URL[] walkRepository (String repositoryPath, URL[] Aggregator) {
    File[] list = new File(repositoryPath).listFiles();
    for (File currentFile : list) {
      if (currentFile.isDirectory()) {
        Aggregator = walkRepository(currentFile.getAbsolutePath(), Aggregator);
      } else if (currentFile.getName ().endsWith (".jar")) {
        try {
          List<URL> tempAgg = new ArrayList<URL>(Arrays.asList(Aggregator));
          tempAgg.add (currentFile.toURI ().toURL ());
          Aggregator = tempAgg.toArray (new URL[] {});
        } catch (Exception ex) {
          System.out.println ("Fail to add " + currentFile.getAbsolutePath() + ".jar file to the classpath.");
        }
      }
    }
    return Aggregator;
  }

mainClass = Class.forName(mainClassName, true, urlClassLoader);