builder.put("bb", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderKeysBy(
        new Ordering<String>() {
          @Override
          public int compare(String left, String right) {
            return left.length() - right.length();
          }
        });
    builder.put("cc", 4);
    builder.put("a", 2);
    builder.put("bb", 6);

                + "     #jdfagdfjagkdjfghksdajfd\n"
                + "     \n"
                + "!!properties\n"
                + "\n"
                + "a=a\n"
                + "b bb as,dn   \n"
                + "c\\r\\ \\t\\nu =:: cu\n"
                + "bu= b\\\n"
                + "                u\n"
                + "d=d\\r\\ne=e\n"
                + "f   :f\\\n"
                + "f\\\n"

    builder.put("bb", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderKeysBy(
        new Ordering<String>() {
          @Override
          public int compare(String left, String right) {
            return left.length() - right.length();
          }
        });
    builder.put("cc", 4);
    builder.put("a", 2);
    builder.put("bb", 6);

    builder.put("bb", 3);
    builder.put("d", 2);
    builder.put("a", 5);
    builder.orderKeysBy(
        new Ordering<String>() {
          @Override
          public int compare(String left, String right) {
            return left.length() - right.length();
          }
        });
    builder.put("cc", 4);
    builder.put("a", 2);
    builder.put("bb", 6);

    }

    @Test
    public void testRecursiveExpressionCycleNPE() throws Exception {
        Map<String, String> props = new HashMap<>();
        props.put("aa", "${bb}");
        props.put("bb", "${aa}");
        DefaultModelBuildingRequest request = new DefaultModelBuildingRequest();

        Model model = Model.newBuilder().properties(props).build();

rX,EAAMuuB,SAAWroB,EACb,gEACAuR,IAGJ,IAAI+W,GAAU5mB,KAAKC,IAmBnB,SAAS4mB,GAAcrP,EAAUhf,EAAO6K,EAAOqX,GAC3C,IAAIxD,EAAQ6C,GAAevhB,EAAO6K,GAMlC,OAJAmU,EAASW,eAAiBuC,EAAYxD,EAAMiB,cAC5CX,EAASY,OAASsC,EAAYxD,EAAMkB,MACpCZ,EAASa,SAAWqC,EAAYxD,EAAMmB,QAE/Bb,EAASe,UAapB,SAASuO,GAAQlnB,GACb,OAAIA,EAAS,EACFI,KAAKiD,MAAMrD,GAEXI,KAAKgD,KAAKpD,GA2DzB,SAASmnB,GAAajP,GAGlB,OAAe,KAAPA,EAAe,OAG3B,SAASkP,GAAalgB,GAElB,OAAiB,OAATA,EAAmB,KA4D/B,SAASmgB,GAAOC,GACZ,OAAO,WACH,OAAOjvB,KAAKkvB,GAAGD,IAIvB,IAAIE,GAAiBH...