struts2启动报错com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1

好久没有搞struts2，今天配置strut2.2.1，启动时遇到个小问题。记录下。

tomcat启动报错：

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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:428)     at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)     at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)     at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)     at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)     at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)     at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838)     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488)     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)     at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)     at org.apache.catalina.core.StandardService.start(StandardService.java:519)     at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)     at org.apache.catalina.startup.Catalina.start(Catalina.java:581)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     at java.lang.reflect.Method.invoke(Method.java:585)     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: java.lang.NullPointerException     at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:220)

原理：

查看struts2插件struts2-spring-plugin中的strtus-plugin.xml

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<struts>     <bean type="com.opensymphony.xwork2.ObjectFactory" name="spring" class="org.apache.struts2.spring.StrutsSpringObjectFactory" />           <!--  Make the Spring object factory the automatic default -->     <constant name="struts.objectFactory" value="spring" />         <constant name="struts.class.reloading.watchList" value="" />     <constant name="struts.class.reloading.acceptClasses" value="" />     <constant name="struts.class.reloading.reloadConfig" value="false" />       <package name="spring-default">         <interceptors>             <interceptor name="autowiring" class="com.opensymphony.xwork2.spring.interceptor.ActionAutowiringInterceptor"/>             <interceptor name="sessionAutowiring" class="org.apache.struts2.spring.interceptor.SessionContextAutowiringInterceptor"/>         </interceptors>     </package>    </struts>

注意下面部分，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。所以导致了启动的问题。

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<bean type="com.opensymphony.xwork2.ObjectFactory" name="spring" class="org.apache.struts2.spring.StrutsSpringObjectFactory" /> <!--  Make the Spring object factory the automatic default --> <constant name="struts.objectFactory" value="spring" />