com/vveye/SW16 has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
编译器比运行环境高。
windows>preferences>java>compiler>compiler compliance level ,选择的9
windows>preferences>java>installed JREs 勾选的jdk1.8
两个不匹配。