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  • Null return value from advice does not match primitive

    Exception in thread "main" org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public int com.fanling.xmlaop.UserDaoImpl.addUser(com.fanling.xmlaop.User)
    	at org.springframework.aop.framework.CglibAopProxy.processReturnType(CglibAopProxy.java:391)
    	at org.springframework.aop.framework.CglibAopProxy.access$000(CglibAopProxy.java:84)
    	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:690)
    

    这个错就是返回的类型不匹配。

    造成的原因:

    目标类的方法有返回值,而around环绕方法没有返回值

    解决方法

    CglibAopProxy.java类
    @Nullable
        private static Object processReturnType(Object proxy, @Nullable Object target, Method method, @Nullable Object returnValue) {
            if (returnValue != null && returnValue == target && !RawTargetAccess.class.isAssignableFrom(method.getDeclaringClass())) {
                returnValue = proxy;
            }
    
            Class<?> returnType = method.getReturnType();
            if (returnValue == null && returnType != Void.TYPE && returnType.isPrimitive()) {
                throw new AopInvocationException("Null return value from advice does not match primitive return type for: " + method);
            } else {
                return returnValue;
            }
        }
    

    方法1:将int 改为包装类型不报错

    方法2:修改around的方法,修改为Object返回类型

        public Object around(ProceedingJoinPoint pjt ){
            Object object = null;
            try {
                System.out.println("环绕通知");
                object= pjt.proceed();
            } catch (Throwable throwable) {
                throwable.printStackTrace();
            }
            return object;
        }
    

      

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  • 原文地址:https://www.cnblogs.com/fanling521/p/10523959.html
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