1、错误描述：在执行maven clean的时候有时会出现 The requested profile “pom.xml” could not be activated because it does not exist 的错误。

 1 [INFO] Scanning for projects...
 2 [INFO] 
 3 [INFO] --------------------------< com.example:demo >--------------------------
 4 [INFO] Building demo 0.0.1-SNAPSHOT
 5 [INFO] --------------------------------[ jar ]---------------------------------
 6 [INFO] 
 7 [INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ demo ---
 8 [INFO] Deleting D:\eclipse\workspace_spring\demo\target
 9 [INFO] ------------------------------------------------------------------------
10 [INFO] BUILD SUCCESS
11 [INFO] ------------------------------------------------------------------------
12 [INFO] Total time: 1.951 s
13 [INFO] Finished at: 2020-11-23T10:52:01+08:00
14 [INFO] ------------------------------------------------------------------------
15 [WARNING] The requested profile "pom.xml" could not be activated because it does not exist.

解决办法：在项目中单击右键 -->属性 -->maven,将此处清空保存即可。