java.lang.RuntimeException: Unable to load bean org.apache.struts2.dispatcher.mu

ct38

　　最近做文件上传的功能时,报如下错误..是因为少了一个jar包的原因..
　　严重: Servlet.service() for servlet default threw exception
java.lang.RuntimeException: Unable to load bean org.apache.struts2.dispatcher.multipart.MultiPartRequest (jakarta) - [unknown location]
 at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:136)
 at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:476)
 at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:486)
 at com.opensymphony.xwork2.inject.ContainerImpl$9.call(ContainerImpl.java:517)
 at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:542)
 at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:515)
 at org.apache.struts2.dispatcher.Dispatcher.wrapRequest(Dispatcher.java:697)
 at org.apache.struts2.dispatcher.FilterDispatcher.prepareDispatcherAndWrapRequest(FilterDispatcher.java:330)
 at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:390)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:394)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 at java.lang.Thread.run(Thread.java:595)
Caused by: Unable to load bean org.apache.struts2.dispatcher.multipart.MultiPartRequest (jakarta) - [unknown location]
 at org.apache.struts2.config.BeanSelectionProvider$ObjectFactoryDelegateFactory.create(BeanSelectionProvider.java:247)
 at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:134)
 ... 21 more
　　解决方案:
　　因为少做文件上传的功能时,少了一个jar包,把commons-fileupload-1.2.2.jar包copy到lib下面即可,重新启动.