原因：
由于项目所需jdk版本和你当前使用的jdk版本不一致导致的，因为我项目的pom.xml中定义了java版本为1.8，但是我实际idea中run这个项目却是1.7
解决方案：
更换当前jdk版本为项目所需jdk版本即可
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