private static List<URL> getJarUrls(String jarString, Shell shell) {
		String[] jars = jarString.split(";");
		List<URL> urls = new ArrayList<URL>();
		if (jars != null) {
			for (int i = 0; i < jars.length; i++) {
				String jar = jars[i];
				if (jar != null && !"".equals(jar.trim())) {
					try {
						URL url = new URL("file:" + jar);
						urls.add(url);
					} catch (MalformedURLException e) {
						MessageDialog.openError(shell, "Jar File Error",
								"Error in jar file path specified in preferences. file: "
										+ jar);
					}
				}
			}
		}
		return urls;
	}