Unsupported major.minor version 52.0 (unable to load class...
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编译打包没问题，证明编译jdk 没有问题；
web容器启动时报 Unsupported major.minor version 52.0 运行时环境不支持52.0版本，即运行时环境jre与编译jdk版本不一致
52.0对应jdk 1.8 ，编译时为1.8运行时不支持1.8（小于1.8）；
解决方法：1、升级运行时jdk版本 或 2、降低打包编译jdk版本至运行时环境jdk版本
附：jdk版本序号对应JDK 8.0 = 52,JDK 7.0 = 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，阅读全文
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