springboot maven项目，为什么build成功，build path也没错误，project-->clean 也没用，项目上面还是有个红x呢？
看错误信息有提示：
Description Resource Path Location Type
Project configuration is not up-to-date with pom.xml. Select: Maven->Update Project... from the project context menu or use Quick Fix. sendemail line 1 Maven Configuration Problem
Project configuration is not up-to-date with pom.xml. Select: Maven->Update Project... from the project context menu or use Quick Fix. sendemail line 1 Maven Configuration Problem
解决办法： 右键项目 maven-->update project 后就可以了