Caused by: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException

Caused by: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'xxx'. It's likely that neither a Result Type nor a Result Map was specified.

해당 에러는 Mapper에 resultType이 명시되지 않아서 발생한 오류였다.