org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public abstract int com.spring.Inter.add(int,int)

报错原因

返回值类型应该是Object

@Pointcut("execution(public int com.spring.InterImple.*(..))")
    public static void point() {}
    
    @Around("point()")
    public static void arround(ProceedingJoinPoint proceedingJoinPoint){
        String name=proceedingJoinPoint.getSignature().getName();
        Object[] args=proceedingJoinPoint.getArgs();
        Object proceed=null;
        System.out.println("环绕前置");
        try {
            proceed= proceedingJoinPoint.proceed(args);
            System.out.println("环绕返回"+name+ Arrays.asList(args));
        } catch (Throwable e) {
            System.out.println("环绕异常");
            e.printStackTrace();

        }finally {
            System.out.println("环绕后置");
        }
        
    }

正确写法

@Pointcut("execution(public int com.spring.InterImple.*(..))")
    public static void point() {}

    @Around("point()")
    public static Object arround(ProceedingJoinPoint proceedingJoinPoint){
        String name=proceedingJoinPoint.getSignature().getName();
        Object[] args=proceedingJoinPoint.getArgs();
        Object proceed=null;
        System.out.println("环绕前置");
        try {
            proceed= proceedingJoinPoint.proceed(args);
            System.out.println("环绕返回"+name+ Arrays.asList(args));
        } catch (Throwable e) {
            System.out.println("环绕异常");
            e.printStackTrace();

        }finally {
            System.out.println("环绕后置");
        }
        return proceed;
    }