工程简介

常见错误

## 问题1 java.lang.NoClassDefFoundError: org/apache/curator/RetryPolicy
    A:guava包冲突
## 问题2 dubboFilter 在客户端没有生效
    A：需要服务提供者在发布的时候指定     <dubbo:consumer check="false" filter="dubboCustomerExtendsInvokeFilter,dubboConsumerFilter,dubboCustomerInvokeFilter"></dubbo:consumer>
## 问题3 META_INF文件 打包丢失
    A: META_INF/dubbo 必须都是文件夹，分开单独创建。打包完毕后，去target目录确认下classes文件夹下是否包含META_INF文件夹
## 问题4：connection timeout
    A: 21:18:10.563 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@627551fb
    21:18:32.458 [main] DEBUG org.springframework.beans.factory.xml.ResourceEntityResolver - Could not resolve XML entity [http://code.alibabatech.com/schema/dubbo/dubbo.xsd] through URL [https://code.alibabatech.com/schema/dubbo/dubbo.xsd]
    java.net.ConnectException: Connection timed out: connect

    A: dubbo2.7.5 不能排除spring-firework

## 问题5 :The bean 'dubboLifecycleComponentApplicationListener' could not be registered. A bean with that name has already been defined and overriding is disabled.
    A: spring.main.allow-bean-definition-overriding=true

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