当@Around 用于 Spring AOP 时，不会检索数据

Question

我是spring AOP，我有如下@Around

@Around(value = "execution(* com.spring.rest.controller.Controller.*(..))")
public void around(ProceedingJoinPoint joinPoint) throws Throwable {
    long start = System.currentTimeMillis();
    joinPoint.proceed();
    long taken = System.currentTimeMillis() - start;
    logger.info("around this {} time taken is {}", joinPoint, taken);
}

在我的 Rest 控制器中，我有 getmapping，当我在浏览器中调用该路由时 没有检索到数据。

从日志中，我发现它返回了 null（在日志信息下方）-- @Around被执行，耗时20秒，@AfterReturning被执行，返回null

2020-05-07 00:41:03.083  INFO 366372 --- [nio-8080-exec-1] lication$$EnhancerBySpringCGLIB$c1be2 : around this execution(List com.spring.rest.controller.Controller.getm()) time taken is 20
2020-05-07 00:41:03.084  INFO 366372 --- [nio-8080-exec-1] lication$$EnhancerBySpringCGLIB$c1be2 : returning execution(List com.spring.rest.controller.Controller.getm()) returned with value null

但是当我删除@Around 时，API 工作正常。

我能知道可能是什么原因以及如何解决这个问题吗？

Answer 1

您需要return对象。

public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
    long start = System.currentTimeMillis();
    Object object = joinPoint.proceed();
    long taken = System.currentTimeMillis() - start;
    logger.info("around this {} time taken is {}", joinPoint, taken);
    return object;
}

当@Around 用于 Spring AOP 时，不会检索数据

when @Around is used for Spring AOP then data is not retrieved

java

spring

spring-aop

spring-boot

spring-restcontroller