java.lang.TypeNotPresentException: Type java.validation.ValidationException not present
java.lang.TypeNotPresentException: Type java.validation.ValidationException not present 如图： 解答： 该问题的产生是springboot在启动时对配置的校验进行预校验，例如发现数据库连接不上之类的问题就会报该错误 思路： 继续往下面找，发现提示数据源有问题，检查一下数据源配置，发现该配置有错，修正后就可以了
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