protected AppDescriptor configure() {
    ConfigurableApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    ResourceConfig config = new PackagesResourceConfig("com.yourcompany.packages", "org.codehaus.jackson.jaxrs");
    config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
    config.getSingletons().add(new SpringComponentProviderFactory(config, applicationContext) );
    LowLevelAppDescriptor appDescriptor = new LowLevelAppDescriptor.Builder(config).build();
    return appDescriptor;
}