Re: Anybody know what is this situation?

> Generally unexplained class issues like this are because the same
> class gets loaded a second time from a different class loader.  I once
> had it throwing a ClassCastException that ClassA != ClassA.  Hard to
> track down, though.
>
> --
> Jeremy Thomerson
> http://www.wickettraining.com
>
>
>
>
> On Fri, Jul 3, 2009 at 4:27 PM, bgooren<bas@...> wrote:
>  
>> I got the same error today, seems totally random.
>>
>> The only possible explanation I have is that maybe the subclass (LoginPage$1
>> in your case) stores a PageHolder class instead of the actual page
>> (LoginPage) when serialized, and when LoginPage$1 is deserialized, the
>> PageHolder retrieves/points to a different Page.
>>
>> I was just as baffled as you since in my case the two classes were totally
>> different, like in your case (com.application.MainPage vs
>> wicket.quickstart.LoginPage).
>> In my case it's two pages from the same application, but they are
>> functionally separate and never interact.
>>
>> In my case I made the inner class that caused the problem a static inner
>> class. Since I have been unable to reproduce the problem I cannot confirm if
>> this resolves the problem.
>>
>> Can you share what kind of class LoginPage$1 is? (it's the first anonymous
>> inner class in LoginPage) Is it a class which extends IModel?
>>
>> Also, you someone from the Wicket team confirm if my explanation above is
>> possible at all (PageHolder retrieving a different class when
>> deserializing)?
>>
>> Bas
>>
>>
>> MartinM wrote:
>>    
>>> Anybody know what is this situation? Wicket 1.4-rc4
>>>
>>> From production:
>>>
>>> 2009-05-18 16:32:44,316 19598423 [btpool0-112] ERROR RequestCycle  -
>>> cannot assign instance of com.application.MainPage to field
>>> wicket.quickstart.LoginPage$1.this$0 of type
>>> wicket.quickstart.LoginPage in instance of
>>> wicket.quickstart.LoginPage$1
>>> java.lang.ClassCastException: cannot assign instance of
>>> com.application.MainPage to field wicket.quickstart.LoginPage$1.this$0
>>> of type wicket.quickstart.LoginPage in instance of
>>> wicket.quickstart.LoginPage$1
>>>        at
>>> java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2032)
>>>        at
>>> java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1212)
>>>
>>> .. etc ...
>>>
>>>      
>> --
>> View this message in context: http://www.nabble.com/Anybody-know-what-is-this-situation--tp23597800p24329006.html
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
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>>    
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