问题描述：
[ERROR] Plugin org.jetbrains.kotlin:kotlin-maven-plugin:1.2.71 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.jetbrains.kotlin:kotlin-maven-plugin:jar:1.2.71: Cannot access aliyunmaven (https://maven.aliyun.com/repository/public) in offline mode and the artifact org.jetbrains.kotlin:kotlin-project:pom:1.2.71 has not been downloaded from it before. -> [Help 1]
解决方法：
setting->maven 取消勾选Work offline
原因
Work offline表示脱机工作，也就是不能连接互联网只有本地仓库去构建仓库。