Exception in thread "main" org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public int aoppoint.User.getUsername()
at org.springframework.aop.framework.CglibAopProxy.processReturnType(CglibAopProxy.java:391)
at org.springframework.aop.framework.CglibAopProxy.access$000(CglibAopProxy.java:82)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:675)
at aoppoint.User$$EnhancerBySpringCGLIB$$ab381b5d.getUsername(<generated>)
at aoppoint.Console.main(Console.java:25)
public void logAround(ProceedingJoinPoint joinPoint) {
System.out.println("userbean方法执行之前 Around，切入的名字 : " + joinPoint.getSignature().getName());
try {
joinPoint.proceed(); //阻塞
System.out.println("userbean方法执行之后 Around，切入的名字 : " + joinPoint.getSignature().getName());
} catch (Throwable throwable) {
throwable.printStackTrace();
System.out.println("userbean方法执行出错 Around，切入的名字 : " + joinPoint.getSignature().getName());
}
}
后来发现是环绕监听会对有返回值的方法做处理，所以需要对 logAround方法修改一下，让它有一个返回值，返回object就可以了
public Object logAround(ProceedingJoinPoint joinPoint) {
System.out.println("userbean方法执行之前 Around，切入的名字 : " + joinPoint.getSignature().getName());
Object result=null;
try {
result = joinPoint.proceed();//阻塞
System.out.println("userbean方法执行之后 Around，切入的名字 : " + joinPoint.getSignature().getName());
} catch (Throwable throwable) {
throwable.printStackTrace();
System.out.println("userbean方法执行出错 Around，切入的名字 : " + joinPoint.getSignature().getName());
}
return result;
}