@Test
public void testGetFromJarFile() throws IOException, JsonReferenceException {

    URL jarFileURL = new URL("jar:file:" + resource("a.jar") + "!/a.json");
    JsonNode jsonNode = (new JsonReferenceProcessor()).read(jarFileURL).at("/a");
    ObjectMapper mapper = new ObjectMapper();
    String json = mapper.writeValueAsString(jsonNode);
    assertThat(json, equalTo("3"));
}