在做文件上传的时候遇到了问题，错误信息：
Unable to load bean org.apache.struts2.dispatcher.multipart.MultiPartRequest (jakarta) - [unknown location]
我导入的jar包是：
xwork-core-2.3.4.jar
xwork-2.1.2.jar
struts2-core-2.3.4.jar
ognl-3.0.5.jar
freemarker-2.3.8.jar
commons-logging-1.0.4.jar
commons-io-2.0.1.jar
commons-fileupload-1.2.2.jar