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From Burton Rhodes <burtonrho...@gmail.com>
Subject Re: Extending StrutsTypeConverter :: How to detect specific type of "Class toClass"?
Date Sun, 01 Oct 2017 03:27:37 GMT
Well shoot - after further testing it seems the issue is still present.  I
isolated the issue in a simple mvn webapp (see link below).  Essentially
Struts conversion fails when: 1) setting form input element to a
List<Integer>, 2) there is only one checkbox in the list, 3) the checkbox
is not checked when the form is submitted.  The situation arises for me
when I need to display a list of checkboxes, but I can't use
<s:checkboxlist/> tag because the page requires a more advanced html
layout.  Thus I am forced to display the checkbox list using an
<s:iterator/> and the <s:checkbox/> tag.  If the displayed list so happens
to have only one element, and the user doesn't check it, the conversion
fails.

I am using now Struts Version 2.5.13.

*Test Struts Webb App*
*Download*: https://www.dropbox.com/s/x27o9a8qky9nwta/listTest.zip?dl=0
*Action*: mvn jetty:run
*Url*: http://localhost:8080/ListConverterTest.action

On Fri, Sep 29, 2017 at 10:56 AM, Burton Rhodes <burtonrhodes@gmail.com>
wrote:

> Sorry for the delay.  I have upgraded to the newest version and everything
> seems to be working.  Thanks!
>
> On Mon, Sep 25, 2017 at 2:34 AM, Lukasz Lenart <lukaszlenart@apache.org>
> wrote:
>
>> 2017-09-25 5:04 GMT+02:00 Burton Rhodes <burtonrhodes@gmail.com>:
>> > When extending the StrutsTypeConverter, is there anyway to figure out if
>> > the "toClass" is a List<Integer> or a List<String>?  I have found
that
>> when
>> > converting data from a submitted webpage that has a value of a List in a
>> > single variable, the standard struts conversion fails.  For example:
>> > <s:hidden name="integerList" value="%{integerList}" /> display as
>> <s:hidden
>> > name="integerList" value="[1,2,3,4,5]" />.  When the form submits, this
>> > value will not convert properly back into the List.  In addition, the
>> > conversion fails if you have a list of checkboxes and the user only
>> checks
>> > one -  hence only a single variable being converted to a List.
>> >
>> > I have solved this issue by creating a MyListConverter, but I have to
>> > declare the converter on each action in a [-conversion.properties] file
>> > which is now becoming a bit cumbersome since this is such a common
>> > occurrence. I have also declared some on my model/entity beans, but
>> > still.... I would love to have a more global "List" converter, such as:
>> >
>> > [xwork-conversion.properties]
>> > java.util.List=com.afs.web.converter.MyListConverter
>> >
>> > Thus any List that is encountered, I could attempt "my conversion" and
>> send
>> > up the chain of command if the resulting List is not of List<Integer>
or
>> > List<String>.
>> >
>> > [Psuedo_Code]
>> > public class MyListConverter extends StrutsTypeConverter {
>> >     public Object convertFromString(Map context, String[] values, Class
>> > toClass) {
>> >         // Is toClass List<Integer>, then try "my" conversion
>> >
>> >         // Else is toClass List<String?, then try "my" conversion
>> >
>> >         // Else return performFallbackConversion(context, o, toClass);
>> >     }
>> > }
>> >
>> > Any ideas?  Or am I going about this incorrectly?
>>
>> What version of Struts do you use? I think this was resolved in 2.5.13
>> or 2.5.12 - I meant conversion of list of built-in types (ints,
>> doubles, etc), to convert your own type just register it (as for the
>> List above).
>>
>>
>> Regards
>> --
>> Ɓukasz
>> + 48 606 323 122 http://www.lenart.org.pl/
>>
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>>
>>
>

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