严重: Error configuring application listener of class org.springframework.web.util.WebAppRootListener
java.lang.ClassNotFoundException: org.springframework.web.util.WebAppRootListener
缺少spring-web jar包，实际是已经通过maven引入，只是需要在eclipse再配置下。
项目->右键属性->Deployment Assembly->add->Java Build Path Entries->选择Maven Dependencies即可
