You must specify exactly one of "forward", "href", "page" or "action
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运行struts代码的时候老是出现上面问题，怎么办，查啊，对代码进行地毯式过滤，终于揪出“元凶”，原来是<html:link>标签惹的祸，我很粗心，竟然套了两层<html:link>标签，如下：
<html:link>
<html:link action="/viewm">编辑</html:link>
</html:link>
这样不错才怪。另外，如果缺少action/href属性时也会出现这样的错误...
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