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Posted to user@struts.apache.org by rohan jamkhedkar <rg...@yahoo.co.in> on 2011/11/19 08:44:22 UTC
Dynamic Result Selection
Hi All,
I am very new to Struts 2, so I don't know whether this issue is discussed before and has a solution. I had dynamic Result selection in my project. Where result would be selected on the basis of execution logic in Action method.
For Example something like,
<action name="test" class="myPackage.Test" >
<result name="success">%{nextPage}</result>
</action>
Where nextPage would be a property in Test class with settter and getter methods. And I would set it to whatever jsp page I want to execute.
It would work fine if Action method is successfully executed.
But the problem was that, if something happened and Action could not be executed, then result would not get invoked. i.e. if validation interceptor found validation errors or my RolesInterceptor found that user does not have access to that method.
Framework would throw exception that result not found.
What can be done here?? Can I set a default nextPage before Interceptors are invoked?? Could writing an Interceptor for that help??
I know that as I am new to Struts 2 I could be doing something wrong. Can anyone help me??
Re: Dynamic Result Selection
Posted by Chris Pratt <th...@gmail.com>.
If the default is something that doesn't change, try putting it in
application scope instead. You would be able to do that once during program
initialization and then forget about it.
(*Chris*)
On Nov 19, 2011 12:23 AM, "rohan jamkhedkar" <rg...@yahoo.co.in>
wrote:
> Hi Christian,
> Thanks again. I think I would have to write my own interceptor. I think I
> can also get nextPage value from session. i.e. I can set value from my
> interceptor to a session variable and also from action and then use it. I
> would try doing that. And if it works out, I would certainly post it.
>
> Thanks & Regards,
> Rohan
>
>
>
> >________________________________
> > From: Christian Grobmeier <gr...@gmail.com>
> >To: rohan jamkhedkar <rg...@yahoo.co.in>
> >Cc: Struts Users Mailing List <us...@struts.apache.org>
> >Sent: Saturday, 19 November 2011 1:42 PM
> >Subject: Re: Dynamic Result Selection
> >
> >On Sat, Nov 19, 2011 at 9:06 AM, rohan jamkhedkar
> ><rg...@yahoo.co.in> wrote:
> >> Hi Christian,
> >> Thank you for your response. I had actually defined all three
> >> results, success, input and error and My class did extend
> ActionSupport. But
> >> the problem was, whenever an error occurred during Interceptor
> invocation,
> >> framework would try to find value of nextPage. As action is not
> executed it
> >> would not find nextPage on valueStack. So I want to know is there any
> way of
> >> getting around this problem? Can I specify value for nextPage before any
> >> interceptor is invoked?
> >
> >Ah, now I understand better.
> >
> >Have you tried to define a default value for $nextPage in your class?
> Like:
> >class MyAction {
> >private String nextPage = "errorpage.jsp";
> >
> >Actually the action itself will not be executed if an interceptor error
> occurs.
> >If the default value does not work, I think it might be a good idea to
> >write an own interceptor which catches something like that or to
> >extend the throwing interceptor to put a correct value into the
> >object.
> >
> >cheers
> >Christian
> >
> >
> >> Thanks & Regards,
> >> Rohan
> >>
> >> ________________________________
> >> From: Christian Grobmeier <gr...@gmail.com>
> >> To: Struts Users Mailing List <us...@struts.apache.org>; rohan
> jamkhedkar
> >> <rg...@yahoo.co.in>
> >> Sent: Saturday, 19 November 2011 1:21 PM
> >> Subject: Re: Dynamic Result Selection
> >>
> >> Hello Rohan,
> >>
> >> On Sat, Nov 19, 2011 at 8:44 AM, rohan jamkhedkar
> >> <rg...@yahoo.co.in> wrote:
> >>>
> >>> <result name="success">%{nextPage}</result>
> >>
> >> try to add these results too:
> >>
> >> <result name="input">%{nextPage}</result>
> >> <result name="error">%{nextPage}</result>
> >>
> >> Input is what is returned when some input is missing, error in case an
> >> error happens.
> >> Please also see the class ActionSupport, were these String constants
> >> are defined. To use it, extend ActionSupport and return for example:
> >> return SUCCESS;
> >>
> >> Of course you don't need to use ActionSupport, but I think it is a good
> idea
> >> :-)
> >>
> >> Cheers
> >> Christian
> >>
> >>
> >> --
> >> http://www.grobmeier.de
> >> https://www.timeandbill.de
> >>
> >>
> >>
> >
> >
> >
> >--
> >http://www.grobmeier.de
> >https://www.timeandbill.de
> >
> >
> >
Re: Dynamic Result Selection
Posted by rohan jamkhedkar <rg...@yahoo.co.in>.
Hi Christian,
Thanks again. I think I would have to write my own interceptor. I think I can also get nextPage value from session. i.e. I can set value from my interceptor to a session variable and also from action and then use it. I would try doing that. And if it works out, I would certainly post it.
Thanks & Regards,
Rohan
>________________________________
> From: Christian Grobmeier <gr...@gmail.com>
>To: rohan jamkhedkar <rg...@yahoo.co.in>
>Cc: Struts Users Mailing List <us...@struts.apache.org>
>Sent: Saturday, 19 November 2011 1:42 PM
>Subject: Re: Dynamic Result Selection
>
>On Sat, Nov 19, 2011 at 9:06 AM, rohan jamkhedkar
><rg...@yahoo.co.in> wrote:
>> Hi Christian,
>> Thank you for your response. I had actually defined all three
>> results, success, input and error and My class did extend ActionSupport. But
>> the problem was, whenever an error occurred during Interceptor invocation,
>> framework would try to find value of nextPage. As action is not executed it
>> would not find nextPage on valueStack. So I want to know is there any way of
>> getting around this problem? Can I specify value for nextPage before any
>> interceptor is invoked?
>
>Ah, now I understand better.
>
>Have you tried to define a default value for $nextPage in your class? Like:
>class MyAction {
>private String nextPage = "errorpage.jsp";
>
>Actually the action itself will not be executed if an interceptor error occurs.
>If the default value does not work, I think it might be a good idea to
>write an own interceptor which catches something like that or to
>extend the throwing interceptor to put a correct value into the
>object.
>
>cheers
>Christian
>
>
>> Thanks & Regards,
>> Rohan
>>
>> ________________________________
>> From: Christian Grobmeier <gr...@gmail.com>
>> To: Struts Users Mailing List <us...@struts.apache.org>; rohan jamkhedkar
>> <rg...@yahoo.co.in>
>> Sent: Saturday, 19 November 2011 1:21 PM
>> Subject: Re: Dynamic Result Selection
>>
>> Hello Rohan,
>>
>> On Sat, Nov 19, 2011 at 8:44 AM, rohan jamkhedkar
>> <rg...@yahoo.co.in> wrote:
>>>
>>> <result name="success">%{nextPage}</result>
>>
>> try to add these results too:
>>
>> <result name="input">%{nextPage}</result>
>> <result name="error">%{nextPage}</result>
>>
>> Input is what is returned when some input is missing, error in case an
>> error happens.
>> Please also see the class ActionSupport, were these String constants
>> are defined. To use it, extend ActionSupport and return for example:
>> return SUCCESS;
>>
>> Of course you don't need to use ActionSupport, but I think it is a good idea
>> :-)
>>
>> Cheers
>> Christian
>>
>>
>> --
>> http://www.grobmeier.de
>> https://www.timeandbill.de
>>
>>
>>
>
>
>
>--
>http://www.grobmeier.de
>https://www.timeandbill.de
>
>
>
Re: Dynamic Result Selection
Posted by Christian Grobmeier <gr...@gmail.com>.
On Sat, Nov 19, 2011 at 9:06 AM, rohan jamkhedkar
<rg...@yahoo.co.in> wrote:
> Hi Christian,
> Thank you for your response. I had actually defined all three
> results, success, input and error and My class did extend ActionSupport. But
> the problem was, whenever an error occurred during Interceptor invocation,
> framework would try to find value of nextPage. As action is not executed it
> would not find nextPage on valueStack. So I want to know is there any way of
> getting around this problem? Can I specify value for nextPage before any
> interceptor is invoked?
Ah, now I understand better.
Have you tried to define a default value for $nextPage in your class? Like:
class MyAction {
private String nextPage = "errorpage.jsp";
Actually the action itself will not be executed if an interceptor error occurs.
If the default value does not work, I think it might be a good idea to
write an own interceptor which catches something like that or to
extend the throwing interceptor to put a correct value into the
object.
cheers
Christian
> Thanks & Regards,
> Rohan
>
> ________________________________
> From: Christian Grobmeier <gr...@gmail.com>
> To: Struts Users Mailing List <us...@struts.apache.org>; rohan jamkhedkar
> <rg...@yahoo.co.in>
> Sent: Saturday, 19 November 2011 1:21 PM
> Subject: Re: Dynamic Result Selection
>
> Hello Rohan,
>
> On Sat, Nov 19, 2011 at 8:44 AM, rohan jamkhedkar
> <rg...@yahoo.co.in> wrote:
>>
>> <result name="success">%{nextPage}</result>
>
> try to add these results too:
>
> <result name="input">%{nextPage}</result>
> <result name="error">%{nextPage}</result>
>
> Input is what is returned when some input is missing, error in case an
> error happens.
> Please also see the class ActionSupport, were these String constants
> are defined. To use it, extend ActionSupport and return for example:
> return SUCCESS;
>
> Of course you don't need to use ActionSupport, but I think it is a good idea
> :-)
>
> Cheers
> Christian
>
>
> --
> http://www.grobmeier.de
> https://www.timeandbill.de
>
>
>
--
http://www.grobmeier.de
https://www.timeandbill.de
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Re: Dynamic Result Selection
Posted by rohan jamkhedkar <rg...@yahoo.co.in>.
Hi Christian,
Thank you for your response. I had actually defined all three results, success, input and error and My class did extend ActionSupport. But the problem was, whenever an error occurred during Interceptor invocation, framework would try to find value of nextPage. As action is not executed it would not find nextPage on valueStack. So I want to know is there any way of getting around this problem? Can I specify value for nextPage before any interceptor is invoked?
Thanks & Regards,
Rohan
>________________________________
> From: Christian Grobmeier <gr...@gmail.com>
>To: Struts Users Mailing List <us...@struts.apache.org>; rohan jamkhedkar <rg...@yahoo.co.in>
>Sent: Saturday, 19 November 2011 1:21 PM
>Subject: Re: Dynamic Result Selection
>
>Hello Rohan,
>
>On Sat, Nov 19, 2011 at 8:44 AM, rohan jamkhedkar
><rg...@yahoo.co.in> wrote:
>>
>> <result name="success">%{nextPage}</result>
>
>try to add these results too:
>
><result name="input">%{nextPage}</result>
><result name="error">%{nextPage}</result>
>
>Input is what is returned when some input is missing, error in case an
>error happens.
>Please also see the class ActionSupport, were these String constants
>are defined. To use it, extend ActionSupport and return for example:
>return SUCCESS;
>
>Of course you don't need to use ActionSupport, but I think it is a good idea :-)
>
>Cheers
>Christian
>
>
>--
>http://www.grobmeier.de
>https://www.timeandbill.de
>
>
>
Re: Dynamic Result Selection
Posted by Christian Grobmeier <gr...@gmail.com>.
Hello Rohan,
On Sat, Nov 19, 2011 at 8:44 AM, rohan jamkhedkar
<rg...@yahoo.co.in> wrote:
>
> <result name="success">%{nextPage}</result>
try to add these results too:
<result name="input">%{nextPage}</result>
<result name="error">%{nextPage}</result>
Input is what is returned when some input is missing, error in case an
error happens.
Please also see the class ActionSupport, were these String constants
are defined. To use it, extend ActionSupport and return for example:
return SUCCESS;
Of course you don't need to use ActionSupport, but I think it is a good idea :-)
Cheers
Christian
--
http://www.grobmeier.de
https://www.timeandbill.de
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