maven中pom.xml首行報錯
錯誤異常：Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 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 nexus has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 from/to nexus (http://maven.aliyun.com/nexus/content/groups/public): maven.aliyun.com
（說明：今天早上開啟eclipse後，就顯出這個錯誤，pom.xml上面有個小紅×，網上試了很多方法）
1.右擊pom.xml->Run As->Maven Clean
pom.xml->Run As->Maven Install
(我用了，沒效果，但是你可以先試試)
2.又嘗試：在c盤使用者裡C:\Users\...\.m2\repository\org\apache\maven\plugins，
（別人的方法：）發現沒有maven-surefire-plugin-2.**.*.jar這樣的檔案........(我發現我都不缺)，->project->maven->update...
3.我的解決方案
A.直接將C:\Users\...\.m2\repository\org\apache\maven\plugins\maven-surefire-plugin，整個資料夾刪除
B.(Alt+F5)或者右擊專案->Maven->Update project
轉載自https://www.cnblogs.com/wx-ym-good/p/7349010.html