将此配置添加到您的包中

Add this configuration to your package

<result-types>
    <result-type name="dynamicJasper" class="ar.com.fdvs.dj.webwork.DJResult"/>
</result-types>

<action name="DownloadSizePdf" class="iland.work.SizesAction" method="fetchDJ">
    <result name="success" type="dynamicJasper">
        <param name="dynamicReport">dr</param>
        <param name="dataSource">sizeList</param>
        <param name="documentName">Dynamic Report generated with struts 2</param>
        <param name="parameters">params</param>
        <param name="format">PDF</param>
        <param name="layoutManager">classic</param>
    </result>
</action>

ActionSupport class位于包名称 com.opensymphony.xwork2 下。从Struts2使用的插件配置中发生错误，这与您使用的Struts版本不兼容。

The ActionSupport class is under the package name com.opensymphony.xwork2. The error is occurred from the configuration of the plugin you use with Struts2 which is incompatible to the version of Struts you use.