Perhaps you are running on a JRE rather than a JDK? 关于 idea maven 缓存的问题 清理 idea maven 缓存
大家好，我是烤鸭：
1. 先检查是否环境变量的问题
参考这篇 https://blog.csdn.net/mingjie1212/article/details/106963143
2. 如果确定环境变量没问题
执行maven install的时候报错，Perhaps you are running on a JRE rather than a JDK
由于我是在控制台执行的，所以不考虑配置的问题。
3. 检查环境变量 jdk 和maven
4. 问题猜想
由于之前环境变量是jre11，发现有问题后换了jdk 8。还是不行，感觉是这个问题。idea 控制台查看maven 版本。果然是这个问题，可以看到idea的环境变量还是之前的。
5. 问题解决
重启和 *Invalidate* *Caches* / *Restart* 都试过了，没办法。这个缓存比较强劲，只能去C盘下手动删除了。
删除目录：
C:\Users\user(用户名)\AppData\Local\JetBrains\IntelliJIdea2020.1\caches
还不行的指定mvn，修改mvn.cmd 第一行增加
set JAVA_HOME=D:\dev\env\jdk\jdk8 （jdk目录）
控制台执行 mvn的时候加上全路径 D:\dev\env\maven\bin\mvn -v ，这回jdk版本就对了
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