Como pegar as propriedades do System.Properties do Java.

        Properties pr = System.getProperties();
        TreeSet propKeys = new TreeSet(pr.keySet());  
        for (Iterator it = propKeys.iterator(); it.hasNext(); ) {
            String key = (String)it.next();
            System.out.println("" + key + "=" + pr.get(key) + "\n");
        }

 Ou

String userDir = System.getProperty("user.dir");