Eclipse Maven Build/Install报错

Eclipse 执行 Maven Install/Maven build报错：No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK

最近开始学习maven，用eclipse执行maven build命令中的tomcat:run时就报错

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

百度到很多解决方案，其中好用一些的就是这个https://blog.youkuaiyun.com/lslk9898/article/details/73836745
把运行环境由tomcat6变成tomcat7确实可以运行了，然后我以为问题就解决了

结果，接着学maven的时候要运行maven install命令，又出现了这个久违的错误，于是又去百度，最终找到了比较完美的解决方案：https://jingyan.baidu.com/article/aa6a2c14f7731d0d4c19c4bb.html
照着这个改完，不管是maven的什么命令，都可以直接运行了，都不会报错，之前的tomcat7也不需要了，直接tomcat:run也不会报错，完美解决