问题：
maven项目引入springcloud相关jar报错
<parent>标签标错 For artifact {org.springframework.cloud:spring-cloud-starter-consul-discovery:null:jar}: The version cannot be empty. (org.apache.maven.plugins:maven-resources-plugin:3.0.1:testResources:default-testResources:process-test-resources)
<dependency>标签报错 Project build error: Non-resolvable import POM: Failure to find org.springframework.cloud:spring-cloud-dependencies:pom:Finchley.M7 in http://maven.aliyun.com/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of window-aliyun has elapsed or updates are forced
解决方案：
第一个是标签报错，提示version不能为空，说明你的引用没有version标签
第二个是报错，提示spring-cloud-dependencies找不到，本地是否没缓存？

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