Struts升级到2.5.5(从2.5.3) [英] Struts Upgrade to 2.5.5 ( from 2.5.3)

问题描述

我试图从Struts 2版本2.5.3升级到2.5.5 ...我遇到了一个奇怪的问题.

I tried to upgrade from struts 2 version 2.5.3 to 2.5.5... I face an strange issue.

我们有一个如下标签:

<%@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>

当我升级时，上面的代码会引发异常！

The above code throws exception when I upgrade !

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！

As you see the tag is a JSTL tag not struts !

我使用Tomcat 8.0. 有任何评论.

I use Tomcat 8.0 . Any comments.

推荐答案

令人惊讶的是，我在标签中使用的parameters名称与struts 2冲突.上下文，这导致名称冲突.

Surprisingly the parameters name which I used in my tag has a conflict with struts 2. It seems that this version of struts has defined a parameters in the context, which made a name conflict.

当我在jsp struts 2.5.3中测试${parameters}时，我注意到

When I test ${parameters} in a jsp struts 2.5.3 I see noting

当我在jsp struts 2.5.5中测试${parameters}时，我看到了org.apache.struts2.dispatcher.HttpParameters

When I test ${parameters} in a jsp struts 2.5.5 I see org.apache.struts2.dispatcher.HttpParameters

所以我将may tag属性重命名为params，一切都很好！

So I renamed may tag attribute to params and everything is fine!

这篇关于Struts升级到2.5.5(从2.5.3)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！