使用Jersey进行REST API身份验证

我正在尝试通过以下this tutorial在我当前的Java Restful API（Jersey）上实现身份验证 . 我将所有新的身份验证类放在"auth"包中 . 当我运行jquery示例代码时，它表示"DemoBusinessRESTResourceProxy is an interface and cannot be instantiated" . 所以我研究并决定将Jersey注释放在DemoBusinessRESTResource上并删除DemoBusinessRESTResourceProxy：

@Local
@Path("access/")
@Stateless(name = "DemoBusinessRESTResource", mappedName = "ejb/DemoBusinessRESTResource")
public class DemoBusinessRESTResource {

    private static final long serialVersionUID = -6663599014192066936L;

    @POST
    @Path("/login")
    @Produces(MediaType.APPLICATION_JSON)
    public Response login(@Context HttpHeaders httpHeaders,
            @FormParam("username") String username,
            @FormParam("password") String password) {

        Authenticator authenticator = Authenticator.getInstance();
        String serviceKey = httpHeaders
                .getHeaderString(HTTPHeaderNames.SERVICE_KEY);

        try {
            String authToken = authenticator.login(serviceKey, username,
                    password);

            JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
            jsonObjBuilder.add("auth_token", authToken);
            JsonObject jsonObj = jsonObjBuilder.build();

            return getNoCacheResponseBuilder(Response.Status.OK).entity(
                    jsonObj.toString()).build();

        } catch (final LoginException ex) {
            JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
            jsonObjBuilder.add("message",
                    "Problem matching service key, username and password");
            JsonObject jsonObj = jsonObjBuilder.build();

            return getNoCacheResponseBuilder(Response.Status.UNAUTHORIZED)
                    .entity(jsonObj.toString()).build();
        }
    }

    @GET
    @Path("/demo-get-method")
    @Produces(MediaType.APPLICATION_JSON)
    public Response demoGetMethod() {
        JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
        jsonObjBuilder.add("message", "Executed demoGetMethod");
        JsonObject jsonObj = jsonObjBuilder.build();

        return getNoCacheResponseBuilder(Response.Status.OK).entity(
                jsonObj.toString()).build();
    }

    @POST
    @Path("/demo-post-method")
    @Produces(MediaType.APPLICATION_JSON)
    public Response demoPostMethod() {
        JsonObjectBuilder jsonObjBuilder = Json.createObjectBuilder();
        jsonObjBuilder.add("message", "Executed demoPostMethod");
        JsonObject jsonObj = jsonObjBuilder.build();

        return getNoCacheResponseBuilder(Response.Status.ACCEPTED).entity(
                jsonObj.toString()).build();
    }

    @POST
    @Path("/logout")
    public Response logout(@Context HttpHeaders httpHeaders) {
        try {
            Authenticator authenticator = Authenticator.getInstance();
            String serviceKey = httpHeaders
                    .getHeaderString(HTTPHeaderNames.SERVICE_KEY);
            String authToken = httpHeaders
                    .getHeaderString(HTTPHeaderNames.AUTH_TOKEN);

            authenticator.logout(serviceKey, authToken);

            return getNoCacheResponseBuilder(Response.Status.NO_CONTENT)
                    .build();
        } catch (final GeneralSecurityException ex) {
            return getNoCacheResponseBuilder(
                    Response.Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    private Response.ResponseBuilder getNoCacheResponseBuilder(
            Response.Status status) {
        CacheControl cc = new CacheControl();
        cc.setNoCache(true);
        cc.setMaxAge(-1);
        cc.setMustRevalidate(true);

        return Response.status(status).cacheControl(cc);
    }
}

现在，我收到了这个错误：

在EJB BusinessRESTResource上调用期间发生系统异常，方法：public javax.ws.rs.core.Response com.rest.auth.DemoBusinessRESTResource.login（javax.ws.rs.core.HttpHeaders，java.lang.String， java.lang.String），引起：java.lang.AbstractMethodError：com.sun.jersey.spi.container.ContainerRequest.getHeaderString（Ljava / lang / String;）Ljava / lang / String;

我是Java WS的新手，我完全迷失了 .