String outText = "";
     try  {
        Hashtable ht =  new  Hashtable();
        //ht.put(Context.AUTHORITATIVE, "true");
        ht.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");
        ht.put(Context.PROVIDER_URL, "dns://ns.xxx.xx/yyy.yy");
        //ht.put("com.sun.jndi.dns.recursion", "true");
        DirContext dc =  new  InitialDirContext(ht);
        Attributes attrs = dc.getAttributes("");
        outText = attrs.toString();
    }  catch  (Exception e) {
        outText = e.toString()
    }