Hi,
there are just two assignments to formData:
@OnEvent(value = EventConstants.PREPARE_FOR_RENDER, component = "searchForm")
void prepareForRender()
{
formData = new ServiceSearchFormData();
// more initialization here, i.e. calling setters like
formData.setCity(DEFAULT_CITY_NAME);
}
...
@OnEvent(value = EventConstants.PREPARE_FOR_SUBMIT, component = "searchForm")
void prepareForSubmit()
{
formData = new ServiceSearchFormData();
}
Cheers
Jarda
> On May25, 2016, at 13:51, Cezary Biernacki <cezary...@gmail.com> wrote:
>
> 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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