idea 找不到类错误ClassNotFoundException解决方案

作者：我家自动化 | 2024-03-26 00:21:33

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idea classnotfoundexception springapplication

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新建了个项目，想添加spring到项目中。却奇怪的遇到错误。找不到ClassNotFoundException。

一般碰到这个错误都是类没有加载进来，检查web.xml没有异常，检查pom文件正常，在web.xml文件中甚至可以进入到spring的监听器中。


 <!-- log4j的配置文件加载 放在最前面才能捕获到spring加载bean的错误，配置文件放根目录才不会有警告-->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.properties</param-value>
    </context-param>
 
    <!--加载spring配置文件位置-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:config/spring/applicationContext-*.xml</param-value>
    </context-param>
 
    <!--捕捉服务器的启动和停止，触发相应的方法-->
    <!-- spring监听器 -->
    <!--<listener>-->
        <!--<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>-->
    <!--</listener>-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

百度之发现其实ecplise中也有人碰到过这种问题，jar明明在却就是找不到，最后的解决方案发现tomcat的应用下面没有lib这个文件夹，导致jar无法放进去，从而出现的这个问题。

下面具体的报错信息：


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:1858)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1701)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:504)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:486)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:113)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4984)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5584)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1859)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)

服务器报错信息：


十一月 28, 2016 11:55:00 下午 org.apache.catalina.core.StandardContext startInternal
严重: One or more listeners failed to start. Full details will be found in the appropriate container log file
十一月 28, 2016 11:55:00 下午 org.apache.catalina.core.StandardContext startInternal
严重: Context [/shadow] startup failed due to previous errors
[2016-11-28 11:55:00,241] Artifact shadow:war exploded: Error during artifact deployment. See server log for details.