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

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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)

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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>

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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" />