如何让Nepxion Discovery 6.x.x最新版本降级使用低版本的Spring Cloud Alibaba

由于Spring Cloud Alibaba从2.2.7.RELEASE升级成Nacos 2.x.x，导致Nacos Server为1.x.x的用户无法使用2.2.7.RELEASE，同时2.2.7.RELEASE相比2.2.6.RELEASE在某个内核构造类上有变更，导致Nepxion Discovery无法同时兼容2.2.7.RELEASE和2.2.6.RELEASE两个版本。整个升级线路上，Nepxion Discovery 6.12.x（含）以下版本支持Spring Cloud Alibaba 2.2.6.RELEASE（含）以下版本，Nepxion Discovery 6.13.x（含）以上版本支持Spring Cloud Alibaba 2.2.7.RELEASE（含）以上版本

那么，如果用户想使用Nepxion Discovery最新版本的功能，但又希望基于低版本的Spring Cloud Alibaba和Nacos，该如何降级？

下载最新代码

从GitHub或者Gitee下载最新源码

降级Spring Cloud Alibaba版本

打开根目录下的pom.xml，把

<spring.cloud.alibaba.version>2.2.7.RELEASE</spring.cloud.alibaba.version>

变更为

<spring.cloud.alibaba.version>2.2.6.RELEASE</spring.cloud.alibaba.version>

变更Nacos装饰类构造方法

• 打开NacosServiceRegistryDecorator.java，把

public NacosServiceRegistryDecorator(NacosServiceManager nacosServiceManager, NacosDiscoveryProperties nacosDiscoveryProperties, NacosServiceRegistry serviceRegistry, ConfigurableApplicationContext applicationContext) {
    super(nacosServiceManager, nacosDiscoveryProperties);

变更为

public NacosServiceRegistryDecorator(NacosDiscoveryProperties nacosDiscoveryProperties, NacosServiceRegistry serviceRegistry, ConfigurableApplicationContext applicationContext) {
    super(nacosDiscoveryProperties);

• 打开NacosApplicationContextInitializer.java，把

NacosServiceManager nacosServiceManager = applicationContext.getBean(NacosServiceManager.class);
NacosDiscoveryProperties nacosDiscoveryProperties = applicationContext.getBean(NacosDiscoveryProperties.class);

return new NacosServiceRegistryDecorator(nacosServiceManager, nacosDiscoveryProperties, nacosServiceRegistry, applicationContext);

变更为

NacosDiscoveryProperties nacosDiscoveryProperties = applicationContext.getBean(NacosDiscoveryProperties.class);

return new NacosServiceRegistryDecorator(nacosDiscoveryProperties, nacosServiceRegistry, applicationContext);

编译Nepxion Discovery

在根目录执行Maven命令，执行编译，并上传到公司的Maven仓库

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