Java 当@Around用于Spring AOP时，则不会检索数据

我是spring AOP，我有下面的@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，没有检索到任何数据

从日志中，我发现它返回null（在日志信息下面）-- @执行Around时需要20秒，@AfterReturning在返回null时执行

2020-05-07 00:41:03.083  INFO 366372 --- [nio-8080-exec-1] lication$$EnhancerBySpringCGLIB$$21c1be2 : 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$$EnhancerBySpringCGLIB$$21c1be2 : returning execution(List com.spring.rest.controller.Controller.getm()) returned with value null

但是当我删除@Around时，API工作得非常好

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我可以知道原因是什么以及如何解决此问题吗？

您需要返回对象

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;
} 

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您需要返回对象

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;
}