最近開始研究struts2，一開始就遇到莫名其妙的問題

在配置struts2時，使用的是Tomcat6.0服務器，按書上說的什么都配置好了的時候，啟動服務器時，總是顯示如下錯誤：??????????????

嚴重: ********** FATAL ERROR STARTING UP STRUTS-SPRING INTEGRATION **********
Looks like the Spring listener was not configured for your web app!
Nothing will work until WebApplicationContextUtils returns a valid ApplicationContext.
You might need to add the following to web.xml:
??? <listener>
??????? <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
??? </listener>

2008-12-14 15:06:26 org.apache.catalina.core.StandardContext filterStart
嚴重: Exception starting filter struts2
java.lang.NullPointerException
??? at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:189)
??? at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:479)
??? at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:450)
??? at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:407)
??? at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)
??? at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
??? at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)
??? at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
??? at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
??? at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
??? at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
??? at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
??? at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
??? at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
??? at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
??? at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222)
??? at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
??? at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
??? at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
??? at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
??? at org.apache.catalina.core.StandardService.start(StandardService.java:448)
??? at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
??? at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
??? at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
??? at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
??? at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
??? at java.lang.reflect.Method.invoke(Unknown Source)
??? at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
??? at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

在網上找了將近一小時，總算給google到解決方案了

有兩種方案

1）嘗試將spring集成到struts2下，所以需要修改web.xml和添加applicationContext.xml

web.xml 部分代碼增加
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
然后在WebRoot>WEB-INF>下加一個空的applicationContext.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="autodetect">
</beans>

2）WEB-INF中的jar包導入有問題，僅僅導入需要的包，如下圖所示，僅僅導入了最最基本的jar包。



本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/dongliang_zhu/

配置struts2出現的奇怪問題