我的應(yīng)用程序結(jié)構(gòu)就像我創(chuàng)建了一個(gè)注釋如下：-@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface SampleAnnotation {}然后創(chuàng)建了一個(gè)示例攔截器：public class SampleInterceptor implements MethodInterceptor {    private static final Logger logger = LoggerFactory.getLogger(SampleInterceptor.class);    @Inject    SampleService sampleService; // this is not working    public Object invoke(MethodInvocation invocation) throws Throwable {        logger.info("SampleInterceptor : Interceptor Invoked");        Object result = invocation.proceed();        Observable<List<Sample>> observable = (Observable<List<Sample>>) result;        SampleSender sender = null;        List<Sample> sampleList = observable.toBlocking().first();        for(Sample sample : sampleList ) {            sender = new SampleSender();            sender.setBoolean(sample.isBoolean());            logger.info("Pushing Data into Sender");            sampleService.insert(String.join("_", "key", "value"), sender); // here getting NullPointerException because sampleService is null        }        return result;    }}然后我創(chuàng)建了一個(gè) GuiceModule 如下：-public class SampleModule extends AbstractModule {    @Override    protected void configure() {        bindInterceptor(Matchers.any(), Matchers.annotatedWith(SampleAnnotation.class), new SampleInterceptor());}}我在其中使用上述注釋的類是// This class also have so many method and this was already declared and using in another services, I created a sample class hereclass SampleClassForInterceptor {      // this sampleMethod() is not a new method, its already created,       // now I am adding annotation to it, because after finishing this functionality,       // I want something should be done, so created annotation and added here      }}我的攔截功能開(kāi)始執(zhí)行之前執(zhí)行sampleMethod()的SampleClassForInterceptor類，然后執(zhí)行后sampleMethod()再次回來(lái)攔截，現(xiàn)在我在這里有一段代碼，將插入的結(jié)果（這是我們從得到sampleMethod()）。這是我得到的地方NullPointerException，我檢查了代碼，發(fā)現(xiàn)該SampleService對(duì)象沒(méi)有被注入，它的值是null注意：我正在使用具有 RESTFUL 服務(wù)概念的微服務(wù)