Struts 2单选按钮与displaytag结合使用

Question

我的JSP中有以下代码。

    <s:form  method="post" action="fetchFpfDataAction" enctype="multipart/form-data">
        <s:textfield name="batchID" key="batchID" size="20" />
         <display:table id="fpfErrorTable" name="fpfErrorList" pagesize="5" cellpadding="5px;"
            cellspacing="5px;" style="margin-left:50px;margin-top:20px;" uid="row" requestURI="">
        <display:column title="Row Number">
            <s:property value="#attr.row_rowNum"/>
        </display:column>
        <display:column property="batchNr" title="Batch Number"/>
        <display:column property="extnlRefNr" title="Claim Number"/>
        <display:column property="respMsgTx" title="Error Message"/>
        <display:column>
            <s:radio name="fpfErrorList[%{#attr.row_rowNum - 1}].errorType" list="errorTypes" value="%{#attr.fpfErrorTable.errorType}" theme="simple"></s:radio>
        </display:column>
        </display:table> 

        <s:submit value="FetchFPFData" align="center" theme="simple" />
        <s:submit value="UpdateFPFData" align="center" action="updateFpfDataAction" theme="simple"/> 
    </s:form>

我可以选择单选按钮选项，我可以在Action类调试语句中看到我的选择，但在再次加载相同的JSP时，单选按钮显示没有任何选择。

public String updateFpfData() {
        if(fpfErrorList != null && fpfErrorList.size() > 0) {
            for (FileProcessingRecordBean fpfError :fpfErrorList) {
                System.out.println("Claim Number "+fpfError.getExtnlRefNr());
                System.out.println("Error Type "+fpfError.getErrorType());
            }
        }

        return SUCCESS;

struts.xml中

<action name="fetchFpfDataAction"
            class="fetchFpfDataAction">
            <interceptor-ref name="loggingStack"></interceptor-ref>
            <result name="success" type="tiles">
                /fpf.tiles
            </result>
            <result name="input" type="tiles">/fpf.tiles</result>
        </action>

        <action name="updateFpfDataAction"
            class="fetchFpfDataAction" method="updateFpfData">
            <interceptor-ref name="loggingStack"></interceptor-ref>
            <result name="success" type="tiles">
                /fpf.tiles
            </result>
            <result name="input" type="tiles">/fpf.tiles</result>
        </action>