Struts2 Wildcard Mapping - more specific one is being handled by generic one

Question

I'm currently playing around with my Struts2 config for wildcard testing and I'm stuck with this one.

    <action name="/*/*" class="checkBlogUrl" method="testing">
        <param name="blogSiteUrl">{1}</param>
        <param name="test">{2}</param>
        <result name="success">/WEB-INF/jsp/cmsPages/index.jsp</result>
    </action>
    
    <action name="/*/postPreview1" class="blogPostAction" method="test">
        <param name="blogSiteUrl">{1}</param>
        <result name="success">/WEB-INF/jsp/cmsPages/templatePicker.jsp</result>
    </action>

If I access myurl.com/hello/hi I will be redirected to index.jsp.

But if I access myurl.com/hello/postPreview1 I will also be redirected to index.jsp instead of templatePicker.jsp.

Am I doing something wrong here? The struts wildcard doc said that the last one will win

EDIT:

Just tried to switch them around and it worked! Am I misreading the doc?

See https://struts.apache.org/docs/action-configuration.html#ActionConfiguration-WildcardDefault. — Aleksandr M, Apr 27 '16 at 08:50
@RomanC I'm not sure about the meaning of context path. the /hello can be any word, i need to query it if exists in the database. the next slash are actions — Jiro Manio, Apr 27 '16 at 08:58
@AleksandrM hm but the default wont work for me since I need to have specific actions on the last slash (eg: postPreview1, hi). I'm just baffled that my wildcards are working on a different way that were declared in the doc — Jiro Manio, Apr 27 '16 at 09:05
does it work that way? I wanted to "force" it so that the /*/* will trigger if and only if there are two slashes because i need the two variables ({1}, {2}) — Jiro Manio, Apr 27 '16 at 09:17
Read the docs. -> *It's important to put a "catchall" wildcard mapping like this at the end of your configuration so it won't attempt to map every request!* — Aleksandr M, Apr 27 '16 at 09:21
The ball to your gate http://stackoverflow.com/q/26741967/573032 — Roman C, Apr 27 '16 at 09:32
@RomanC oh so that's how. Thanks. Can you post an answer, or tag this question as duplicate? — Jiro Manio, Apr 27 '16 at 09:39

Roman C · Accepted Answer · 2021-03-22T04:58:32.387

You are using slashes in action name, that incorrectly works with wildcard mapper. As I said in the linked answer, the best pattern matcher in this case is the regex pattern matcher.

<constant name="struts.patternMatcher" value="regex"/>

See Advanced Wildcards.

<action name="/{blogSiteUrl}/{test}" class="checkBlogUrl" method="testing">
    <result name="success">/WEB-INF/jsp/cmsPages/index.jsp</result>
</action>

<action name="/{blogSiteUrl}/postPreview1" class="blogPostAction" method="test">
    <result name="success">/WEB-INF/jsp/cmsPages/templatePicker.jsp</result>
</action>

About docs for wildcard mapper. Lets look at the example blank application:

<package name="example" namespace="/example" extends="default">

    <action name="HelloWorld" class="example.HelloWorld">
        <result>/WEB-INF/jsp/example/HelloWorld.jsp</result>
    </action>

    <action name="Login_*" method="{1}" class="example.Login">
        <result name="input">/WEB-INF/jsp/example/Login.jsp</result>
        <result type="redirectAction">Menu</result>
    </action>

    <action name="*" class="example.ExampleSupport">
        <result>/WEB-INF/jsp/example/{1}.jsp</result>
    </action>

    <!-- Add actions here -->
</package>

So URLs will be matched in the order:

http://localhost:8080/example/HelloWorld
http://localhost:8080/example/Login_input
http://localhost:8080/example/Register

I would say that more specific mapping goes before less specific/common mapping and it wins because it's found first in the order of action configs. Everything that doesn't match the ordered configs fall into last mapping which is less specific.

Hello, can you add an example how annotation approach will looks like in this case? — Maksim Kostromin, Nov 10 '18 at 22:36
` ` I have this in my struts.xml, along with the xml tag for patternMatcher with the value of regex. But I get the error `There is no Action mapped for action name 2` when I access using the URL `http://localhost:8080/wildcard_sample/2/hello/3.json`. I am using `Struts 2.5.29`. @Roman C — Kavin Raju S, Feb 09 '22 at 02:23

score 0 · Answer 2 · answered Feb 09 '22 at 02:17

In your case,from the official docs,

Mappings are matched against the request in the order they appear in the framework’s configuration file. If more than one pattern matches the last one wins, so less specific patterns must appear before more specific ones. However, if the request URL can be matched against a path without any wildcards in it, no wildcard matching is performed and order is not important.

https://struts.apache.org/core-developers/wildcard-mappings.html#wildcards

Struts2 Wildcard Mapping - more specific one is being handled by generic one

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