this version of the Java Runtime only recognizes class file versions up to 52.0 (unable to load clas

翻译题目，可知是JDK版本问题，编译器的运行环境的JDL版本高于tomcat版本，降低JDK版本就行

ideaJDK降级

点击file—project structure—project settings–project—project language level

如图，8即为1.8，我将JDK修改成这个后完美解决问题。