Why struts.xml is correct, but the page is 404?

Question

Struts version is 2.3.16

In struts.xml, I added this

<action name="ajaxuser" class="com.pp.ajax.UserAccount">
    <result name="success">/out.jsp</result>
</action>

the xml and the UserAccount class are correct, because some request to this url is OK, but some request is 404.

This is the successful request

Request URL:http://localhost:8080/pp/ajaxuser
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate
Accept-Language:zh-TW,zh;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Content-Length:45
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Cookie:JSESSIONID=B6D15A95251B1477473BC524E7E9E148; Siggraph-Fontresizer=105; targetEncodinghttp://your-site=1; PHPSESSID=k2fi36gbn8979riffibp2mt1f7; _ga=GA1.1.2049659497.1410967472
Host:localhost:8080
Origin:http://localhost:8080
Referer:http://localhost:8080/pp/user-account
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36
X-Requested-With:XMLHttpRequest
Form Dataview sourceview URL encoded
userId:2
username:b
password:b
oper:edit
id:8
Response Headersview source
Content-Length:5
Content-Type:text/html;charset=ISO-8859-1
Date:Thu, 25 Sep 2014 07:09:26 GMT
Server:Apache-Coyote/1.1

---

And this is the failed request

Remote Address:127.0.0.1:8080
Request URL:http://localhost:8080/pp/ajaxuser
Request Method:POST
Status Code:404 Not Found
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate
Accept-Language:zh-TW,zh;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Content-Length:55
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Cookie:JSESSIONID=B6D15A95251B1477473BC524E7E9E148; Siggraph-Fontresizer=105; targetEncodinghttp://your-site=1; PHPSESSID=k2fi36gbn8979riffibp2mt1f7; _ga=GA1.1.2049659497.1410967472
Host:localhost:8080
Origin:http://localhost:8080
Referer:http://localhost:8080/pp/user-account
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36
X-Requested-With:XMLHttpRequest
Form Dataview sourceview URL encoded
userId:abc
username:abc
password:abc
oper:add
id:_empty
Response Headersview source
Content-Language:en
Content-Length:1089
Content-Type:text/html;charset=utf-8
Date:Thu, 25 Sep 2014 07:10:15 GMT
Server:Apache-Coyote/1.1

I cannot see any different between these two request, so I don't understand why this problem occurred

I also added a breakpoint at the begin of UserAccount, but the program cannot reach this breakpoint, and server show this error

WARNING: Could not find action or result: /pp/ajaxuser
No result defined for action com.pp.ajax.UserAccount and result input

I have no idea how to trace this problem, what can I do now?

Answer 1

You are doing POST request and the validation interceptor might return INPUT result. Usually you can fix it with adding an INPUT result to the action configuration.

<action name="ajaxuser" class="com.pp.ajax.UserAccount">
    <result name="success">/out.jsp</result>
    <result name="input">/out.jsp</result>
</action>

you can also exclude this action from validation by removing validation interceptor from the action config or adding method to the interceptor config parameter excludeMethods by overriding it, then you don't need this result.