출처 : https://rios.tistory.com/entry/Tomcat-%EC%A7%80%EC%A0%95%EB%90%9C-%EC%84%9C%EB%B9%84%EC%8A%A4%EA%B0%80-%EC%84%A4%EC%B9%98%EB%90%9C-%EC%84%9C%EB%B9%84%EC%8A%A4%EB%A1%9C%EB%8A%94-%EC%97%86%EC%8A%B5%EB%8B%88%EB%8B%A4
https://velog.io/@tostman/Spring-java.lang.exceptionininitializererror-%EC%97%90%EB%9F%AC-%EC%9E%A1%EB%8A%94%EB%B2%95-Windows-10
https://velog.io/@tostman/Spring-java.lang.exceptionininitializererror-%EC%97%90%EB%9F%AC-%EC%9E%A1%EB%8A%94%EB%B2%95-Windows-10