com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1问题出现的原因及解决办法

严重: Exception starting filter struts2

Class: com.opensymphony.xwork2.spring.SpringObjectFactory

File: SpringObjectFactory.java

Method: getClassInstance

Line: 220 - com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1

at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)

at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:195)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)

at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)

at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)

at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:553)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488)

at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1215)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)

at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.NullPointerException

at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:220)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:530)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:501)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:457)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:275)

at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)

at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:204)

at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)

at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:380)

at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:424)

... 20 more

2011-8-28 1:19:47 org.apache.catalina.core.StandardContext start

严重: Error filterStart

2011-8-28 1:19:47 org.apache.catalina.core.StandardContext start

严重: Context [] startup failed due to previous errors

一、原因：

问题处在你导入的“Struts2 Spring Libraries”库下的“Struts2-spring-plugin-2.2.1.jar”jar包下的struts-plugin.xml里。如下图：



问题出现的具体位置在上图所示的第29行的代码，这段代码如下：

<bean type="com.opensymphony.xwork2.ObjectFactory" name="spring" class="org.apache.struts2.spring.StrutsSpringObjectFactory" />

这 表明该插件引入工程后，会自动设置Struts的 ObjectFactory为
StrutsSpringObjectFactory，从而让Spring的IOC容器来托管Struts的Action。但是
在工程的web.xml中 没有配置
加载spring ApplicationContext相关的listener ，从而导致了启动时出现的问题：com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1。

二、解决办法

在工程的web.xml中 配置
加载spring ApplicationContext相关的listener ，配置的代码如下：

<context-param>

<param-name>

contextConfigLocation

</param-name>

<param-value>

/WEB-INF/applicationContext.xml

</param-value>

</context-param>

<listener>

<listener-class>

org.springframework.web.context.ContextLoaderListener

</listener-class>

</listener>

终于解决了这个小问题，记录一下，方便查看和回顾，也希望能帮到遇到这个问题需要寻求帮助的朋友。