Hi,
@Barry, yes, your solution should fix null pointer exception, but probably
it would break the application. A better way:
public SearchFormData getFormData() {
if (formData == null) {
formData = new SearchFormData();
}
return formData;
}
However, it is still interesting that formData is null (assuming that there
is no other code explicitly assigning a value to this field).
On Wed, May 25, 2016 at 12:37 PM, Barry Books <trs...@gmail.com> wrote:
> It's difficult to say why it might be null but changing the code to
>
> public SearchFormData getFormData() {
> return new SearchFormData();
> }
>
> should fix it
>
> On Monday, May 23, 2016, Jaroslav Ciml <jaroslav.c...@jpower8.cz> wrote:
>
> > Hi,
> >
> > I am getting a strange exception during submit of a Tapestry form that I
> > cannot explain. It happens just rarely (but regularily) in the production
> > environment. I cannot even reproduce the exception.
> >
> > I have a form in tml file of a Tapestry component.
> >
> > ...
> > <t:form t:id="searchForm" clientValidation="none">
> > ....
> > <t:select t:id="globalSport" model="globalSportModel"
> > value="formData.globalSportId" blankOption="never"/>
> > ....
> > </t:form>
> > ..
> >
> > And here is the important part of corresponding Java file:
> >
> > ...
> > @Property(read = true, write = false)
> > private ServiceSearchFormData formData;
> > ...
> > @OnEvent(value = EventConstants.PREPARE_FOR_SUBMIT, component =
> > "searchForm")
> > void prepareForSubmit()
> > {
> > formData = new ServiceSearchFormData();
> > }
> > ...
> >
> > It seems to be pretty straightforward. ServiceSearchFormData is a DTO
> with
> > few attributes and getter / setter methods. It encapsulates data
> submitted
> > in the form. An instance is created on "prepare for submit" event.
> >
> > The exception occurs in scope of a POST request that submits data to this
> > form. The exception message states:
> >
> > Failure writing parameter 'value' of component
> > MyPortal:portalindex.portalsearchform.globalsport: Property 'formData'
> > (within property expression 'formData.globalSportId', of
> > cz.ftm.fitsoftware.webapp.components.PortalSearchForm@3262579e) is null.
> >
> > I have no idea how this happens. How can the property formData be
> > uninitialized? It seems that the method prepareForSubmit is not called.
> >
> > Thanks for help.
> > Jarda
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> >
>
