Simple authentication for jax-rs resources

SecretResource.java

@Path("/secret")
public class SecretResource {

    @GET
    @Path("/secured")
    public String showSecret(@Auth User user) {
        return "Hello " + user.getUsername() + ". This is secret!";
    }


    @GET
    @Path("/free")
    public String showFree(@Auth(required = false) User user) {
        if (user == null) {
            return "Hello anonymous";
        }
        return "Hello " + user.getUsername() + ". This is a freely accessible page";
    }
}