GOOGLE后,知道产生这问题的原因有:
1.struts2的配置文件没有放在src目录下(其实是没有放在/WEB-INF/classes/目录下),
2.struts2中配置的package标签的namespace属性配置有误
3.页面调用Action的方式有错
但我这次产生这错误都不是上面的原因.
因为我是使用ajax方式提交,所以package扩展于json-default,其它配置(略),
检查配置都没有问题,检查调用方式也没问题,最后想想好像JSON for struts2的插件JAR包还没加上,找到对应STRUTS2相应版本的struts-json-plugin-xxx.jar,加入到应用,问题解决.
最后,加入最后一个导致如题的问题原因:
4.没有加入json对应的插件JAR包
转载http://blog.csdn.net/qwerasdf123/archive/2010/08/19/5823846.aspx
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