[Eclipse] Error configuring application listener of class org.springframework.web.context.ContextLoaderListener

서버 세팅 후 Tomcat start 를 하는 데 아래와 같이 에러가 발생합니다.

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)

해결 방법

해당 프로젝트를 우클릭하여 Properties > Deployment Assembly 에 관련 라이브러리를 추가해주었더니 에러가 나지 않았습니다.