错误提示：java.lang.UnsupportedClassVersionError: com/spring/demo05/Demo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only reco

之前用的JDK12替换了1.8后出现如下错误提示

错误提示：java.lang.UnsupportedClassVersionError: com/spring/demo05/Demo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only reco

是编译的class文件对应的jdk版本与当前jdk版本不匹配。

解决方案

把项目右键--javaCompiler--版本改成当前的版本（1.8）

错误提示：java.lang.UnsupportedClassVersionError: com/spring/demo05/Demo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only reco

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