1. 문제상황

> 다음과 같은 에러와 함께 Eclipse에서 Tomcat이 실행되지 않았다.

심각: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1854)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1703)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:506)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:488)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:115)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4919)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5517)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

---

2. 문제확인

> Maven > Update Project Configuration 실행시 maven 라이브러리 경로가 삭제되는 현상이 발생한다고 한다.

---

3. 문제해결

> 다음 메뉴에서 경로를 설정해주면 정상적으로 서버가 시작된다.

* 프로젝트 우클릭 >  properties
* Deployment Assembly > Add 버튼 > Java Build Path Entries > Maven Dependencies 선택 > Apply버튼