You can either use Json plugin or write your own customized result type that 
return JSON.

--- On Tue, 10/27/09, Michael Varlik <m.var...@gmx.de> wrote:

> From: Michael Varlik <m.var...@gmx.de>
> Subject: Adding Json to existing action
> To: user@struts.apache.org
> Received: Tuesday, October 27, 2009, 1:07 PM
> Hi,
> 
> I need to call an existing struts action within my
> application from a
> JavaScript function. I thought it might be possible to
> create an additional entry in the struts mapping file like
> this:
> 
> <action name="getDataJson"
> class="com.mypackage.MyAction" method="getData">
> <result type="json" />
> </action>
> 
> and then call the action with "getDataJson.action".
> Unfortunately, when I try this a NullPointerException
> occurs in the action code. It seems, some parameters are not
> properly initialized.
> 
> What I'd like to know is: what is the recommendet way of
> calling an existing action to get JSON results? Is it a good
> idea to do this at all?
> 
> Cheers,
> Markus 
> -- 
> Neu: GMX DSL bis 50.000 kBit/s und 200,- Euro
> Startguthaben!
> http://portal.gmx.net/de/go/dsl02
> 
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> 


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