问题：
1.新建项目后会提示一个这样的错
maven-compiler-plugin:3.1:compile(1 errors)
maven-compiler-plugin:3.1:testCompile(1 errors)
2.关掉后看pom.xml
3.plugin标签也报错，无法解析
鼠标放红叉上提示
错误：
CoreException: Could not calculate build plan: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failed to read artifact
descriptor for org.apache.maven.plugins:maven-compiler-plugin:jar:3.1: UnresolvableModelException: Failure to transfer org.apache.maven:maven-parent:pom:23 from 
http://maven.aliyun.com/
nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of alimaven has elapsed or updates are forced. Original error: Could
not transfer artifact org.apache.maven:maven-parent:pom:23 from/to alimaven (http://maven.aliyun.com/nexus/content/groups/public/): sun.security.validator.ValidatorException: PKIX path
building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
- Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile (execution: default-testCompile, phase: test-compile)
- Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (execution: default-compile, phase: compile)
解决：
排查eclipse配置maven的地方，和配置的仓库都没问题
再排查settings.xml，可以尝试更换镜像的配置，但我不是这个问题（可以换成下面这个，是我成功后的）
<mirrors>
<mirror>
<id>nexus-aliyun</id>
<mirrorOf>*</mirrorOf>
<name>Nexus aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>
</mirrors>
因为错误是说解析不了plugin，我猜想是上次更新时强制关闭eclipse导致某些包没更新好，然后导致版本问题之类的总之无法解析出来报错，就重新换了一个仓库，就成功了
我认为应该是你自己的maven仓库里\org\apache\maven目录下的一些关于plugin的包受损了 ，也可以尝试只更换别人好的maven文件夹
原文地址：https://www.cnblogs.com/xjd-6/p/11351069.html