原因：JDK版本不兼容。运行的Java Class文件采用高版本的JDK编译，然后在低版本的JRE环境中运行，有时会报此错误。
解决：1）升级JDK
2）调整Eclipse中Java Compiler到对应的jdk
3）Installed JREs 添加对应的jre
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