No result defined for action and result input的错误很常见，那是没有配置出错时的默认视图，出现这类现象，你可以检查如下几个方面：
1、页面中是否有重名的控件，就是说页面中的控件或隐藏域中有相同名字的控件，而它们在Action中又给引用到。其中把控件放在<s:iterator>中尤为常见。
2、return的视图在配置文件中是否存在，建议打开文件后用搜索，有时名字长点，英语字母看乱了。
3、页面返回值与Action中定义是否一致，返回值是否会出多一些莫名其妙的东西
4、尝试给页面的空值设默认值
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