com/opensymphony/xwork2/spring/SpringObjectFactory

最新推荐文章于 2019-12-21 20:57:45 发布

转载最新推荐文章于 2019-12-21 20:57:45 发布 · 175 阅读

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原文链接：https://my.oschina.net/xiekakaban/blog/369894

文章标签：

#java #运维 #python

本文探讨了在使用Struts2开发过程中遇到的启动异常问题，具体为在导入Struts2SpringLibraries库下的Struts2-spring-plugin.jar包后，由于web.xml中未配置加载springApplicationContext相关的listener而导致的错误。文章详细分析了问题所在，并提供了简单易行的解决办法，即在需要使用时再导入spring包，以避免不必要的复杂配置。

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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

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。

解决办法是不要导入 struts2-spring-plugin-2.3.16.1.jar 包

就是这么简单，等需要用的时候在导入spring包。说句实话，用ssm（ssh）开发配置实在是太麻烦了。

转载于:https://my.oschina.net/xiekakaban/blog/369894