java - JSTL遍历arrayList，似乎删除数据

Question

好的，所以我正在开发一个显示所选年份的事件的 JSP。It works fine for 2012, but when 2013 is selected it doesn't work. 可能是因为那里没有数据，但仍应显示月份。

请记住，我是 CS 大二的实习生

这是填充月份数组列表的方法。

public List getMonths() {
    List months = new ArrayList();

    Map tempMap = new HashMap();
    tempMap.put("month", "January"); 
    tempMap.put("value", 1); 
    months.add(tempMap); 

    tempMap  = new HashMap();
    tempMap.put("month", "February"); 
    tempMap.put("value", 2); 
    months.add(tempMap); 

    tempMap   = new HashMap();
    tempMap.put("month", "March"); 
    tempMap.put("value", 3); 
    months.add(tempMap); 

    tempMap = new HashMap();
    tempMap.put("month", "April"); 
    tempMap.put("value", 4); 
    months.add(tempMap); 

    tempMap = new HashMap();
    tempMap.put("month", "May");
    tempMap.put("value", 5);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "June");
    tempMap.put("value", 6);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "July");
    tempMap.put("value", 7);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "August");
    tempMap.put("value", 8);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "September");
    tempMap.put("value", 9);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "October");
    tempMap.put("value", 10);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "November");
    tempMap.put("value", 11);
    months.add(tempMap);

    tempMap = new HashMap();
    tempMap.put("month", "December");
    tempMap.put("value", 12);
    months.add(tempMap);

    tempMap = new HashMap();
    return months;
}

然后我使用这段代码来设置属性：

request.setAttribute("months", getMonths());    
request.setAttribute("parkEvents", parkEventsList);
request.setAttribute("parkYears", parkYearsList);
request.setAttribute("currentYear", year);

这是应该显示月份的 JSTL 代码，但似乎循环 "c:forEach var="months" items="${months}" 在 2013 年没有迭代。有什么想法吗？

<div>
    <form>
        <select onchange="javascript:window.open(this.value,'_self')">
        <c:forEach var="years" items="${parkYears}">
        <option value=/events.html?display_year=${years}<c:if test="${currentYear == years}"> selected="selected"</c:if>>${years}</option>
        </c:forEach>
        </select>

    </form>
    </div>

<c:set var="years" value="${currentYear}"/>
<div class="generaltext">
  <!-- begin accordion -->
<div class="accordion" id="${years}" style="margin-top: 20px; display: none;"><!-- begin fas section -->

    <c:forEach var="months" items="${months}">
        <div class="section">
        ${years}
            <div class="sectionHeader inactiveHeader" id="${months.value}${years}SectionHeader">
            <a onclick="_showSectionContentContainer('${months.value}${years}Section'); return false;" href="#">
            <img id="${months.value}${years}SectionArrow_down" alt=""  src="/export/resources/images/arrows/grayRightSmall.gif" />
            <img id="${months.value}${years}SectionArrow_right" alt="" style="display: none;" src="/export/resources/images/arrows/grayDownSmall.gif" />${months.month} ${years}</a>
            </div>

            <div class="sectionContent" id="${months.value}${years}Section" style="display: none;"><br/>
        <c:set var="counter" value="0" />
            <c:forEach var="event" items="${parkEvents}">
                <c:if test="${event.eventYear == years && event.eventMonth == months.value && event.eventDay != counter}">
                    </br><b> ${event.eventMonth}/${event.eventDay}/${event.eventYear}</b></br>
                <c:set var="counter" value="${event.intEventDay}" />
                </c:if>
                <c:if test="${event.eventYear == years && event.eventMonth == months.value && event.eventDay == counter}">
                    - <a target="_blank" href="http://fwp.mt.gov/eCalendar/ViewItem.html?cal_item_id=${event.id}&dtwhen=${event.intStartingDate}">${event.description} </a><br/>
                </c:if>
            </c:forEach> 
            </div>

        </div>  
        </c:forEach>


</div>        <!-- end accordion -->
</div>