![[Java / Spring] Log4j2 could not find... / org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML](https://img1.daumcdn.net/thumb/R750x0/?scode=mtistory2&fname=https%3A%2F%2Fblog.kakaocdn.net%2Fdn%2Fbz3tu6%2Fbtr3SICmzJK%2FPs2WyZjJfGvm2er7agc5Z1%2Fimg.png)
엑셀 파일을 자바와 스프링을 활용하여 엑셀파일의 데이터를 출력 하는 과정에서 아래의 에러들이 생겼다 ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console... Exception in thread "main" org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE..
![[Java] NoClassDefFoundError : org/apache/commons/io/output/UnsynchronizedByteArrayOutputStream](https://img1.daumcdn.net/thumb/R750x0/?scode=mtistory2&fname=https%3A%2F%2Fblog.kakaocdn.net%2Fdn%2Fcolx6W%2Fbtr3XyZz5Ba%2F2GWrU6l1bE49g9KAzjO6f0%2Fimg.png)
학원 과제로 자바 코드로 엑셀 파일 입,출력을 다루는 과정에서 에러가 발생했다. 해결 검색을 진행하였고, 아래의 스택플로우 글을 발견해서 pom.xml에 주입해 주었더니 잘 돌아간다. https://stackoverflow.com/questions/72186962/java-lang-noclassdeffounderror-org-apache-commons-io-output-unsynchronizedbytea java.lang.NoClassDefFoundError: org/apache/commons/io/output/UnsynchronizedByteArrayOutputStream When I try to execute automation script I'm getting error as "java.lang.N..