MyFaces Tomahawk ignores checkbox in dataList on first submission

[Wally Hartshorn]

We're using MyFaces with Tomahawk and are seeing some strange behavior that appears to be related to t:dataList and certain types of form elements.

Suppose you have a form with code like this:

...
<h:selectBooleanCheckbox value="#{myBean.boxNotInDataList}"/>
...
<t:dataList value="#{myBean.things}" var="oneThing">
    ...
    <h:selectBooleanCheckbox value="#{myBean.boxInDataList}">
    ...
</t:dataList>
...

Note that one checkbox is outside of the dataList, the other is inside the dataList.

Suppose I were to do this:

display the form

select both checkboxes

click submit

I would find that the value of the checkbox that is inside the t:dataList is ignored -- the value of myBean.boxInDataList would NOT be set to "true". The checkbox outside of the t:dataList would work just fine.

Stranger still, if I were to:

display the form

select both checkboxes

do something that will cause a validation error (e.g. leave a required field blank)

click submit

Then I would find that when the form was redisplayed with the validation error message, the checkbox within the t:dataList would NOT be checked. The checkbox that is outside of the t:dataList would properly remember that I had checked it.

Strangest of all, if I were to:

display the form

select both checkboxes

do something that will cause a validation error (e.g. leave a required field blank)

click submit

observe on the redisplayed form that the checkbox in the t:dataList is not checked

reselect the checkbox

correct the validation error

resubmit the form

Then I would find that the value of the checkbox in the t:dataList is NO LONGER IGNORED.

What the...?

Is this a bug in MyFaces Tomahawk or is there something subtle going on here that I'm missing?