maven搭建项目新建Source Folder的时候,提示信息The folder is already a source folder.

原因:maven自己引的jdk包不对,需要重新引包

操作方式:

选择Project Explorer-->JRE System Library[jdk1.X]右键-->Build Path-->Remove from Build Path,引入自己安装的jdk包即可

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转载自zhangshufei8001.iteye.com/blog/2377244