validator.validate(model, problems);
        assertEquals(2, problems.messages.size());

        repo.setUrl("http://xxx.xxx.com");
        problems = new SimpleProblemCollector();
        validator.validate(model, problems);
        assertEquals(1, problems.messages.size());

        repo.setId("xxx");
        problems = new SimpleProblemCollector();
        validator.validate(model, problems);

            return true;
        }
    }

    private boolean isValidProfileId(String id) {
        switch (id.charAt(0)) { // avoid first character that has special CLI meaning in "mvn -P xxx"
            case '+': // activate
            case '-': // deactivate
            case '!': // deactivate
            case '?': // optional
                return false;
            default:
        }