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Posted to user@struts.apache.org by Perpetual Newbie <sr...@uab.edu> on 2004/04/20 22:20:35 UTC
Newbie question: Can anything cause the controller servlet to set
the ActionForm bean twice
Hi,
I had an error that I have not been able to replicate ... and am hence
vague on the specifics.
It occured twice on different systems on different days before I had
debugging statements inline.
It appears that the ActionForm bean was set twice (after a post) before
any other processing occured.
With this limited information, has anyone seen something similar ? Or
perhaps what might be the root cause or what might trigger it.
After this, the action called the validate() manually where an exception
was thrown ... (possibly because of null values set during the second
set).
--
Thanks,
pnewbie
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RE: Newbie question: Can anything cause the controller servlet to set the ActionForm bean twice
Posted by "Kunal H. Parikh" <ku...@carsales.com.au>.
Hey Neil!
Can you update me on the Struts' transaction token handling?
What exactly is Struts' transaction token handling?
TIA,
Kunal
-----Original Message-----
From: Neil Erdwien [mailto:neil@k-state.edu]
Sent: Wednesday, 21 April 2004 06:59
To: Struts Users Mailing List
Subject: Re: Newbie question: Can anything cause the controller servlet to
set the ActionForm bean twice
I've seen cases where a user accidentally double-clicks on the submit
button and submits the form twice in quick succession.
Struts' transaction token handling can prevent multiple submissions from
being processed. However, I think this would happen after the
ActionForm has been populated, so may not fix the problem you're seeing.
Perpetual Newbie wrote:
> Hi,
>
> I had an error that I have not been able to replicate ... and am hence
> vague on the specifics.
> It occured twice on different systems on different days before I had
> debugging statements inline.
>
> It appears that the ActionForm bean was set twice (after a post) before
> any other processing occured.
>
> With this limited information, has anyone seen something similar ? Or
> perhaps what might be the root cause or what might trigger it.
>
> After this, the action called the validate() manually where an exception
> was thrown ... (possibly because of null values set during the second
> set).
>
> --
> Thanks,
> pnewbie
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
--
Neil Erdwien, neil@k-state.edu, Web Technologies Manager
Computing and Network Services, Kansas State University
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Re: Newbie question: Can anything cause the controller servlet to
set the ActionForm bean twice
Posted by Neil Erdwien <ne...@k-state.edu>.
I've seen cases where a user accidentally double-clicks on the submit
button and submits the form twice in quick succession.
Struts' transaction token handling can prevent multiple submissions from
being processed. However, I think this would happen after the
ActionForm has been populated, so may not fix the problem you're seeing.
Perpetual Newbie wrote:
> Hi,
>
> I had an error that I have not been able to replicate ... and am hence
> vague on the specifics.
> It occured twice on different systems on different days before I had
> debugging statements inline.
>
> It appears that the ActionForm bean was set twice (after a post) before
> any other processing occured.
>
> With this limited information, has anyone seen something similar ? Or
> perhaps what might be the root cause or what might trigger it.
>
> After this, the action called the validate() manually where an exception
> was thrown ... (possibly because of null values set during the second
> set).
>
> --
> Thanks,
> pnewbie
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
--
Neil Erdwien, neil@k-state.edu, Web Technologies Manager
Computing and Network Services, Kansas State University
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Re: Newbie question: Can anything cause the controller servlet to
set the ActionForm bean twice
Posted by Perpetual Newbie <sr...@uab.edu>.
On Tue, 20 Apr 2004, Hubert Rabago wrote:
Thanks for the response.
Have included the relevant sections.
I realize it may take some effort to go through this.
Thanks in advance for all the effort.
pnewbie
> It would help if you post your mapping as well as the code in the action
> which deals with form processing, validation, and error handling.
> Without seeing anything, I could guess that maybe:
> a) Your input="url" points to another Struts action, in which case validate()
> might be called again depending on the mapping
> b) Your <forward> points to another Struts action, in which case validate()
> might be called again depending on the mapping
> c) Your user hit submit twice upon submitting a form
> d) Your user got the error page after a validation failure and instead of
> correcting the mistake, hit refresh instead to resubmit the form
1. I was the user on both occassions.(Was manually testing)
2. Did not hit it twice. (In any case tried to hit it twice later to
replicate error to no avail.)
3. The very same steps succeed every time except on those two occassions.
a. <html:form action="/casestudiesdetail" enctype="multipart/form-data" >
<html:submit property="save" onclick="setAction('save')">
And some javascript that sets action to 'save'
b.
/********************************************/
else
if(action.equals("save"))
{
CaseStudiesDetailForm detailForm =(CaseStudiesDetailForm)form;
ActionErrors actErrors = detailForm.validate(mapping,req);
if(!actErrors.isEmpty())
{
saveErrors(req,actErrors);
return mapping.findForward("editPage");
}
CaseStudyService service = new CaseStudyService();
System.out.println("before calling the upload the file");
/********************************************/
Note: On these two occassions (only), ... "before calling the upload the
file" was not printed out in catalina.out
c. Exception handling (Unfortunately ... the exception thrown was a
NullPointer at: if(e.getMessage().startsWith("errors."))
The actual error was lost.
/********************************************/
catch(Exception e)
{
if(e.getMessage().startsWith("errors."))
{
errors1.add(ActionErrors.GLOBAL_ERROR,new
ActionError(e.getMessage()));
}
}
/********************************************/
d. catalina.out
Note that the pattern is repeated after 12 lines.
In the logs the only two times this happened were when this error
occured.
Hence the suspicion that the form values were set twice.
CASE ID SELECTED ::54
***************act.getPath() ::/case_studies_detail.jsp
in get other sections2
in get other sections1
in get related offerings1
in get related offerings2
in get other sections2
in get other sections0
in get related offerings1
in get related offerings2
in get related offerings0
in get other sections0
in get related offerings0
in get other sections1
in get other sections2
in get other sections1
in get related offerings1
in get related offerings2
in get other sections2
in get other sections0
in get related offerings1
in get related offerings2
in get related offerings0
in get other sections0
in get related offerings0
in get other sections1
[WARN] RequestProcessor - -Unhandled Exception thrown: class
java.lang.NullPointerException
e. The only two ActionForm methods that print to stdout:
Got this from a friend :Rather than using nested, use a get before the
name of a bean that contains other beans within it and return the inner
bean. This has been working fine all along.
public RelatedOfferingsBean getRelOffId(int i)
{
System.out.println("in get related offerings"+i);
return (RelatedOfferingsBean)relatedOfferingsList.get(i);
}
public OtherCaseSectionBean getOtherSecId(int i)
{
System.out.println("in get other sections"+i);
return (OtherCaseSectionBean)otherSectionList.get(i);
}
Thanks,
pnewbie
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Re: Newbie question: Can anything cause the controller servlet to set the ActionForm bean twice
Posted by Hubert Rabago <ja...@yahoo.com>.
It would help if you post your mapping as well as the code in the action
which deals with form processing, validation, and error handling.
Without seeing anything, I could guess that maybe:
a) Your input="url" points to another Struts action, in which case validate()
might be called again depending on the mapping
b) Your <forward> points to another Struts action, in which case validate()
might be called again depending on the mapping
c) Your user hit submit twice upon submitting a form
d) Your user got the error page after a validation failure and instead of
correcting the mistake, hit refresh instead to resubmit the form
--- Perpetual Newbie <sr...@uab.edu> wrote:
> Hi,
>
>
>
> I had an error that I have not been able to replicate ... and am hence
>
> vague on the specifics.
>
> It occured twice on different systems on different days before I had
>
> debugging statements inline.
>
>
>
> It appears that the ActionForm bean was set twice (after a post) before
>
> any other processing occured.
>
>
> With this limited information, has anyone seen something similar ? Or
>
> perhaps what might be the root cause or what might trigger it.
>
>
>
> After this, the action called the validate() manually where an exception
>
> was thrown ... (possibly because of null values set during the second
>
> set).
>
>
>
> --
>
> Thanks,
>
> pnewbie
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
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