RESTX java 8 endpoint with lambda capturing local variable

endpoint-fragment.java

    @GET("/helloConcat")
    @PermitAll
    public Iterable<String> concatMessages(String q) {
        String c = q + "test";
        return asList(NAMES)
                .stream()
                .map((s) -> (s + c))
                .collect(Collectors.toList());
    }