我的应用程序结构就像
我创建了一个注释如下：-
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface SampleAnnotation {
}
然后创建了一个示例拦截器：
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;
}
}
然后我创建了一个 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释的类是
// This class also have so many method and this was already declared and using in another services, I created a sample class here
class 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
}
}
我的拦截功能开始执行之前执行sampleMethod()的SampleClassForInterceptor类，然后执行后sampleMethod()再次回来拦截，现在我在这里有一段代码，将插入的结果（这是我们从得到sampleMethod()）。这是我得到的地方NullPointerException，我检查了代码，发现该SampleService对象没有被注入，它的值是null
注意：我正在使用具有 RESTFUL 服务概念的微服务
桃花长相依
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