这工作：
<div class="det" id="displayFields">
<table class="det">
<tr>
<td>
<c:forEach items="${detFieldMap}" var="detFieldEntry" varStatus="loop">
<c:if test="${not loop.first and loop.index % 5 == 0}">
</td>
</tr>
<tr>
<td>
</c:if>
<fieldset class="det">
<legend>${detFieldEntry.key}</legend>
<c:forEach items="${detFieldEntry.value}" var="detBean">
<input type="check@R_177_2419@" name="fieldNames" value="${detBean.fieldName}" <c:if test="${preselectionMap[detBean.fieldName]}">checked="checked"</c:if>>${detBean.displayName}</input>
</br>
</c:forEach>
</fieldset>
</c:forEach>
</td>
</tr>
</table>
</div>
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