AjaxFormSubmitBehavior throws an NullPointerException when the getForm() is overridden

[zoltan luspai <zl...@gmail.com>]

Hi,


I have an AjaxFormSubmitBehavior where I don't pass the form parameter 
in the constructor, but have overridden the getForm() method to find the 
related form. (The form is not parent of the button this behavior is 
attached to, so can not be found by the behavior itself).


When I "click" on the button attached, the form is submitted nicely, but 
after the onSubmit call I get this exception:


java.lang.NullPointerException

    at 
org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:142)
    at 
org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:166)
    at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:299)
    at 
org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:113)
    at 
org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
    at 
org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1240)
    at org.apache.wicket.RequestCycle.step(RequestCycle.java:1319)


Having a look at the source it seems there is a but at this line in 
AjaxFormSubmitBehavior:


    @Override
    protected void onEvent(AjaxRequestTarget target)
    {
        ...
        if (form.findParent(Page.class) != null)
        ...
    }

I think that should be :
    ... getForm().findParent(Page.class)


unless, there is a good reason not to be so?

Btw; I am using wicket version 1.4rc4.


Cheers

Zoltan

Re: AjaxFormSubmitBehavior throws an NullPointerException when the getForm() is overridden

[Erik van Oosten <e....@grons.nl>]

Please file an issue in Jira, preferably with a quickstart to 
demonstrate the problem. A patch would be even better of course.

Regards,
    Erik.

zoltan luspai wrote:
> Hi,
>
>
> I have an AjaxFormSubmitBehavior where I don't pass the form parameter 
> in the constructor, but have overridden the getForm() method to find 
> the related form. (The form is not parent of the button this behavior 
> is attached to, so can not be found by the behavior itself).
>
>
> When I "click" on the button attached, the form is submitted nicely, 
> but after the onSubmit call I get this exception:
>
>
> java.lang.NullPointerException
>
>    at 
> org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:142) 
>
>    at 
> org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:166) 
>
>    at 
> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:299) 
>
>    at 
> org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:113) 
>
>    at 
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92) 
>
>    at 
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1240) 
>
>    at org.apache.wicket.RequestCycle.step(RequestCycle.java:1319)
>
>
> Having a look at the source it seems there is a but at this line in 
> AjaxFormSubmitBehavior:
>
>
>    @Override
>    protected void onEvent(AjaxRequestTarget target)
>    {
>        ...
>        if (form.findParent(Page.class) != null)
>        ...
>    }
>
> I think that should be :
>    ... getForm().findParent(Page.class)
>
>
> unless, there is a good reason not to be so?
>
> Btw; I am using wicket version 1.4rc4.
>
>
> Cheers
>
> Zoltan
>
>


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