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From Yasser Zamani <>
Subject RE: Struts2 Checkboxlist
Date Tue, 05 Feb 2019 11:43:46 GMT
Hi Prasanth,

Yes, I think. Now I can recall a long discussion about this at [1]. i.e. you also can keep
array list of long but override the interceptor like below [2]:

<action name="ListConverterTest" class="com.afs.ListConverterTestAction">
<interceptor-ref name="defaultStack">
<param name="checkbox.uncheckedValue">-1</param>

Kind Regards.


>-----Original Message-----
>From: Prasanth Pasala <>
>Sent: Tuesday, February 5, 2019 3:26 AM
>Subject: Re: Struts2 Checkboxlist
>I am using the defaultStack but the ArrayList used for the checkboxes is of type
>Long. If we change it to ArrayList of Boolean would the interceptor set the values
>to false? Or is this only applicable if you have individual checkboxes rather than
>On 2/4/19 4:29 PM, Paul Zepernick wrote:
>> Yes, setFoo is only called if the checkbox is checked.  However,
>> Struts 2 does have a checkbox interceptor:
>> This interceptor defaults checkbox Boolean's to False if the box is not checked.
>This is part of the default interceptor stack.
>> Paul
>> -----Original Message-----
>> From: Prasanth Pasala <>
>> Sent: Monday, February 4, 2019 5:21 PM
>> To:
>> Subject: Re: Struts2 Checkboxlist
>> NOTICE: This email originated from outside of the organization. Do not click
>links or open attachments unless you recognize the sender and know the content
>is safe.
>> Is that how Struts2 is expected to work? Meaning setFoo would not be called if
>non of the Foo checkboxes are selected? I know that is how Struts1 worked.
>> Thanks,
>> Prasanth
>> On 2/2/19 7:08 PM, Prasanth Pasala wrote:
>>> Hi Yasser,
>>> When none of the checkboxes is selected the setFoo is not getting called.
>>> Thanks
>>> Prasanth
>>> On February 2, 2019 8:02:07 AM CST, Yasser Zamani
><> wrote:
>>>> Hi Prasanth,
>>>> AFAIK this tag is like this:
>>>> <s:checkboxlist name="foo" list="bar" value="baz"/>
>>>> It calls getBar method of your action or finds bar in value stack to
>>>> find out what to display. Same for baz to find out which to be
>>>> selected. Then it calls yourAction.setFoo to post selected items. i.e.
>>>> it is up to you what you do with it in setFoo method. Normally you
>>>> should clear baz and fill it with them again to update selected items.
>>>> Thanks for using Struts!
>>>> Kind Regards.
>>>>> -----Original Message-----
>>>>> From: Prasanth <>
>>>>> Sent: Saturday, February 2, 2019 1:08 AM
>>>>> To:
>>>>> Subject: Struts2 Checkboxlist
>>>>> Hi,
>>>>> I am using a checkboxlist on a jsp page which corresponds to a
>>>> ArrayList in the
>>>>> form class, which is used to store form data from a multi page wizard.
>>>> I am using
>>>>> scope interceptor to store the form class in session so that the
>>>>> data
>>>> persists as
>>>>> the user navigates the wizard. When the user selects some check
>>>>> boxes
>>>> it is
>>>>> correctly populated in the form class but if the user navigates
>>>>> back
>>>> in the wizard
>>>>> and unchecks the check box (non of the check boxes selected) struts
>>>> doesn't set
>>>>> the ArrayList to empty. It will still contain the old selection.
>>>>> What
>>>> is the best way
>>>>> to solve this issue?
>>>>> My Options:
>>>>> 1. Should I use Preparable and set this ArrayList to empty? Since
>>>>> this
>>>> is a wizard
>>>>> (multiple pages submitting to the same action) have to make sure it
>>>>> is
>>>> done only
>>>>> when submitting the page that have these checkboxes.
>>>>> 2. Create two separate ArrayLists, one to get values from Struts
>>>>> and
>>>> another to
>>>>> save the original selection and clear the first array list. Down
>>>>> side
>>>> is I need to
>>>>> populate the list linked to the form when user navigates back to
>>>>> that
>>>> page.
>>>>> Neither of them seem elegant. Is there a way to make struts set the
>>>> ArrayList to
>>>>> empty when user doesn't select any check box?
>>>>> Using Struts 2.3.35
>>>>> Thanks,
>>>>> Prasanth
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