Problem accessing GET parameter in Struts2

[Christoph Kepper <ke...@diefirma.de>]

Hi,

I am new to Struts and new to this list. I want to create a blog with 
struts as a university project and have been wrestling with this 
(obscenely) simple problem for two days without any progress. Maybe any 
of you struts experts may help out here:

All I want to do is access a GET parameter from an action to initialize 
an article object. This is how my URL looks like:

http://localhost:8080/struts_blog/artikel.action?artnr=1

In my struts.xml I specified an action that is correctly mapped to my 
action class:

<action name="artikel" method="input" class="action.ArtikelAction">
   <result name="success" type="redirectAction">admin</result>
   <result name="input">/WEB-INF/jsp/artikelForm.jsp</result>
</action>

My action class (ArtikelAction.java) contains the property "private 
Integer artnr" with the appropriate Getters and Setters. From what I 
read in the documentation and saw in the examples, this should be 
sufficient for the params interceptor to initialize the variable. 
However, this is not the case :-(

What am I missing?

I tried to get some debug information from the params interceptor and 
put the following code into my struts.xml (inside the action):
<interceptor-ref name="params">
   <param name="logEnabled">true</param>
   <param name="logLevel">DEBUG</param>
</interceptor-ref>

However, this just gave me the following exception when starting my project:
13.03.2008 09:18:42 com.opensymphony.xwork2.util.OgnlUtil 
internalSetProperty
WARNUNG: Caught OgnlException while setting property 'logLevel' on type 
'com.opensymphony.xwork2.interceptor.ParametersInterceptor'.
ognl.NoSuchPropertyException: 
com.opensymphony.xwork2.interceptor.ParametersInterceptor.logLevel

So, how could I debug the params interceptor?

I am using the latest struts-2.0.11.1 release libraries and have set 
devMode to true in struts.xml.

Thanks for your help.
Christoph


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Re: Problem accessing GET parameter in Struts2

[Christoph Kepper <ke...@diefirma.de>]

Thanks to your hint I found the mistake :-)

Dave Newton wrote:
>> I tried to get some debug information from the params interceptor and 
>> put the following code into my struts.xml (inside the action):
>> <interceptor-ref name="params">
>>    <param name="logEnabled">true</param>
>>    <param name="logLevel">DEBUG</param>
>> </interceptor-ref>
> 
> Nate that when you use an interceptor-ref element inside an action
> configuration then *only* that interceptor-ref will be configured for that
> action: this means that in this case if this is the only interceptor-ref
> inside the action element then *only* the "params" interceptor will be run
> for that action. This is probably not what you want.
> 

After inserting the basicStack interceptor into the action, the variable 
was correctly initialized:

<interceptor-ref name="params" />
<interceptor-ref name="basicStack" />

Nevertheless, I still don't get any log info from the interceptors.

Christoph

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Re: Problem accessing GET parameter in Struts2

[Dave Newton <ne...@yahoo.com>]

--- Christoph Kepper <ke...@diefirma.de> wrote:
> <action name="artikel" method="input" class="action.ArtikelAction">
>    <result name="success" type="redirectAction">admin</result>
>    <result name="input">/WEB-INF/jsp/artikelForm.jsp</result>
> </action>
> 
> My action class (ArtikelAction.java) contains the property "private 
> Integer artnr" with the appropriate Getters and Setters.

As a sanity check, what are your getter and setters named?

> I tried to get some debug information from the params interceptor and 
> put the following code into my struts.xml (inside the action):
> <interceptor-ref name="params">
>    <param name="logEnabled">true</param>
>    <param name="logLevel">DEBUG</param>
> </interceptor-ref>

Nate that when you use an interceptor-ref element inside an action
configuration then *only* that interceptor-ref will be configured for that
action: this means that in this case if this is the only interceptor-ref
inside the action element then *only* the "params" interceptor will be run
for that action. This is probably not what you want.

Dave


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