com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1問題出現的原因及解決辦法

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

嚴重: Context [] startup failed due to previous errors

一、原因：

      問題處在你導入的“Struts2 Spring Libraries”庫下的“Struts2-spring-plugin-2.2.1.jar”jar包下的struts-plugin.xml裏。如下圖：

       問題出現的具體位置在上圖所示的第29行的代碼，這段代碼如下：

<bean type="com.opensymphony.xwork2.ObjectFactory" name="spring" class="org.apache.struts2.spring.StrutsSpringObjectFactory" />
       這表明該插件引入工程後，會自動設置Struts的ObjectFactory爲StrutsSpringObjectFactory，從而讓Spring的IOC容器來託管Struts的Action。但是在工程的web.xml中沒有配置加載spring ApplicationContext相關的listener，從而導致了啓動時出現的問題：com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1。

 

二、解決辦法

在工程的web.xml中配置加載spring ApplicationContext相關的listener，配置的代碼如下：

 

    <context-param>
        <param-name>
            contextConfigLocation
        </param-name>
        <param-value>
            /WEB-INF/classes(此處的classes是否需要視applicationContext.xml的位置而定)/applicationContext.xml
        </param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>