今天搭建新的项目，虽然在web.xml中配置了ContextLoaderListener以及IntrospectorCleanupListener
如下：
web.xml中部分代码：
<!-- 监听servletContext，启动contextConfigLocation中的spring配置信息 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!-- 防止spring内存溢出监听器 可用可不用-->
<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>
但是，在项目启动的时候，依旧报错：
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.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:492)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4676)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5216)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1386)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1350)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1586)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:280)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1164)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1388)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1392)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1360)
at java.lang.Thread.run(Unknown Source)
五月 15, 2017 8:44:23 下午 org.apache.catalina.core.StandardContext listenerStart
严重: Error configuring application listener of class org.springframework.web.util.IntrospectorCleanupListener
java.lang.ClassNotFoundException: org.springframework.web.util.IntrospectorCleanupListener
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:492)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4676)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5216)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1386)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1350)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1586)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:280)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1164)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1388)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1392)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1360)
at java.lang.Thread.run(Unknown Source)
解决方法：
项目上，右键 properties，选择进入Deployment Assembly,
然后将Maven库的架包 也选择部署，这样项目就能读取到相关的架包，就可以正常启动而不会因为找不到 某些类