🌳 에러 코드
2023-04-14 15:58:04,738 ERROR [org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet]] Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.mybatis.spring.MyBatisSystemException] with root cause
org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
🌳 해결 방법
🌾 원인 : DB에 중복된 아이디
🌾 해결 방법 : DB 중복된 아이디 삭제.
