项目框架为SpringMVC+Spring+Mybatis，启动tomcat时报错如下：
严重: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:142)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4876)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5455)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
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)
六月 22, 2018 4:55:32 下午 org.apache.catalina.core.StandardContext listenerStart
严重: Skipped installing application listeners due to previous error(s)
六月 22, 2018 4:55:32 下午 org.apache.catalina.core.StandardContext startInternal
严重: Error listenerStart
六月 22, 2018 4:55:32 下午 org.apache.catalina.core.StandardContext startInternal
严重: Context [/generator] startup failed due to previous errors
六月 22, 2018 4:55:32 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-80"]
六月 22, 2018 4:55:32 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-bio-8009"]
六月 22, 2018 4:55:32 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 1388 ms解决：右键项目，点击Properties，选择Deployment Assembly，如下界面，点击Add
选择 Java Build Path Entries
选择 Maven Dependencies，点击Finish，最后点击 Apply and Close，重启即可
