code: public static void addLibraryPath(String pathToAdd) throws Exception {
  		Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");
  		usrPathsField.setAccessible(true);
  
  		// get array of paths
  		final String[] paths = (String[]) usrPathsField.get(null);
  
  		// check if the path to add is already present
  		for (String path : paths) {
  			if (path.equals(pathToAdd)) {
  				return;
  			}
  		}
  
  		// add the new path
  		final String[] newPaths = Arrays.copyOf(paths, paths.length + 1);
  		newPaths[newPaths.length - 1] = pathToAdd;
  		usrPathsField.set(null, newPaths);
  	}
docs: Adds the specified path to the java library path
  
  @param pathToAdd the path to add
  @throws Exception