我试图从struts 2版本升级2.5.3到2.5.5…。我遇到一个奇怪的问题。

我们有一个标签如下：

<%@tag description="Rensders an ajax link"   pageEncoding="UTF-8"%>

<%@attribute name="parameters" description="list of parameters that put to this link"
    type="java.util.HashMap" required="false"%>

       ..............
        <c:forEach items="${parameters}" var="p">
                <c:param name="${p.key}" value="${p.value}"/>
        </c:forEach>

升级时，以上代码会引发异常！

Caused by: javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in <forEach>
    at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toForEachIterator(ForEachSupport.java:274)
    at org.apache.taglibs.standard.tag.common.core.ForEachSupport.supportedTypeForEachIterator(ForEachSupport.java:238)
    at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:155)
    at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:256)
    at org.apache.jsp.tag.web.html.link_tag._jspx_meth_c_005fforEach_005f0(link_tag.java:439)
    at org.apache.jsp.tag.web.html.link_tag._jspx_meth_c_005furl_005f0(link_tag.java:405)
    at org.apache.jsp.tag.web.html.link_tag._jspx_meth_sec_005fauthorize_005f0(link_tag.java:366)
    at org.apache.jsp.tag.web.html.link_tag.doTag(link_tag.java:230)

如您所见，该标记是JSTL标记，而不是struts！

我使用Tomcat 8.0。任何意见。