try
      {
		  // a jar file
   		  String jarFileName;
 
   		  jarFileName = args[0];
 
		  //File file = new File(jarFileName);
		  JarFile jarFile = new JarFile(jarFileName);
		  System.out.println("Manifest Name: " + jarFile.MANIFEST_NAME);
		  Enumeration jarContents = jarFile.entries();
		  while(jarContents.hasMoreElements())
		  {
			  ZipEntry zipVersion = (ZipEntry)jarContents.nextElement();
			  System.out.println("ZipFile: " + zipVersion);
		  }
 
          // extract jar file contents and put them into the hashtable.
          FileInputStream fileStream = new FileInputStream(jarFileName);
          BufferedInputStream buffStream = new BufferedInputStream(fileStream);
          ZipInputStream zipStream = new ZipInputStream(buffStream);
          ZipEntry zipEntry = null;
          while ((zipEntry = zipStream.getNextEntry())!= null)
          {
          	  System.out.println("zipEntry Name = "+zipEntry.getName() +
          	  							", " + "zipEntry Size = "+ zipEntry.getSize());
	  	  }
       } catch (NullPointerException e) {
          System.out.println("done.");
       } catch (FileNotFoundException e) {
          e.printStackTrace();
       } catch (IOException e) {
          e.printStackTrace();
       }