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 )
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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 >
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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" />
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