具体异常：
log4j:ERROR Could not instantiate class [org.apache.ibatis.session.AutoMappingUnknownColumnBehaviorTest$LastEventSavedAppender].log4j:ERROR Could not instantiate class
阅读背景：
MyBatis日志log4j异常ERROR Could not instantiate class [org.apache.ibatis.session.AutoMappingUnknownColum
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