Hi,
Looking at the code, it's looking like there's some race condition
going on, with the request coming in for a component that no longer
exists. Comparing with the 1.3 code (in
AbstractRequestCycleProcessor#resolveListenerInterfaceTarget()),
there's an explicit check for a null, but there's nothing that can
really be done to recover, i.e. even the 1.3 code is as follows...
if (component == null)
{
throw new WicketRuntimeException("component " + pageRelativeComponentPath +
" not found on page " + page.getClass().getName() + "[id = " +
page.getNumericId() + "], listener interface = " + listener);
}
Maybe you could disable the button via client-side javascript once
clicked?
/Gwyn
On 07 November 2007, 9:45:24 PM, salmas wrote:
s> I tried disabling the button during the event and while this was easy enough
s> to implement it did not help. My page contains a table which has panels in
s> different cells. I swap these panels in and out depending on wether the user
s> is in 'edit' mode or 'submit' mode and also according to where they are in
s> the workflow.
s> I noticed that the method of PropertyColumn which I am overriding
s> populateItem(Item item, String componentId, IModel model) completes, as does
s> the event handling code at the button press so I am not sure what is
s> breaking down. It's easy to reproduce this error. All I have to do is to
s> click a button which is present in one of the panels rapidly, at every click
s> I do toggle the name of the button from "edit" to "save" so I don't know if
s> this has something to do with it.
s> I do need this problem resolved because this is not acceptable for a
s> production application. I would really appreciate any ideas that you have.
s> salmas wrote:
>>
>>
>> I am using wicket-1.2.6. Unfortunately it is not possible for me to
>> upgrade to a newer version.
>>
>>> Hi salmas,
>>>
>>> On 07 November 2007, 7:05:26 PM, salmas wrote:
>>> s> Every once in awhile if I am clicking around for awhile in the UI of
>>> my
>>> s> application I get the following error. What causes this?
>>>
>>> s> java.lang.NullPointerException
>>> s> at
>>> s>
>>> wicket.request.compound.DefaultRequestTargetResolverStrategy.resolveListenerInterfaceTarget(DefaultRequestTargetResolverStrategy.java:295)
>>>
>>> What version of Wicket are you using?
>>>
>>> --
>>> /Gwyn
>>>
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