导读：提示错误 Project lsquo;Project Namersquo; is missing required source folder: lsquo;genrsquo;。费了半天劲原来是因为JDK升级所至。进行下面的设置就行了：Use Project Properties Ja......
提示错误 ProjectProject Nameis missing required source folder:gen 。费了半天劲原来是因为JDK升级所至。进行下面的设置就行了：
Use Project > Properties > Java Compiler > JDK Compliance > Compiler compliance level: 1.6
