Exception in thread “main“ java.lang.UnsupportedClassVersionError:

Exception in thread “main” java.lang.UnsupportedClassVersionError: org/springframework/boot/SpringApplication has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0

原因是你的jdk版本太低了，编译不了，要么升级jdk要么就降spring boot的版本

JDK 17 = 61,
JDK 16 = 60,
JDK 15 = 59,
JDK 14 = 58,
JDK 13 = 57,
JDK 12 = 56,
JDK 11 = 55,
JDK 10 = 54,
JDK 9 = 53,
JDK 8 = 52,
JDK 7 = 51,
JDK 6.0 = 50,
JDK 5.0 = 49,
JDK 1.4 = 48,
JDK 1.3 = 47,
JDK 1.2 = 46,
JDK 1.1 = 45.0-45.6
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原文链接：https://blog.csdn.net/lzhfdxhxm/article/details/117018384

jdk 1.8的

maven>update project更新一下后就可以了