[WICKET-2330] AjaxFormSubmitBehavior throws an NullPointerException when getForm() is overridden

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4-RC4
• Fix Version/s: 1.4-RC6
• Assignee: Igor Vaynberg
• Reporter: Zoltan Luspai
• Created: 17/Jun/09 15:49
• Updated: 17/Jun/09 16:05
• Resolved: 17/Jun/09 16:05

Description

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.