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From "Pinaki Poddar" <>
Subject RE: Cloning Calendar proxies
Date Thu, 04 Oct 2007 20:42:36 GMT
One of the reasons of these objects being proxied is that their change
can mark the owning persistent entity as dirty.  

Pinaki Poddar

>-----Original Message-----
>From: Evan Ireland [] 
>Sent: Thursday, October 04, 2007 3:29 PM
>Subject: RE: Cloning Calendar proxies
>Just curious, why are Calendar objects being proxied in the 
>first place? 
>> -----Original Message-----
>> From: Kevin Sutter []
>> Sent: Friday, 5 October 2007 9:01 a.m.
>> To:
>> Subject: Cloning Calendar proxies
>> Hi,
>> It seems that the IBM JDK is cloning a Calendar object when 
>> the
>> .equals() method.  If I call .equals() on one of our Calendar proxy 
>> objects, the underlying implementation seems to be cloning 
>the object 
>> before determining the equality.  While using this cloned 
>object, one 
>> of the setter methods is called.  Since this is a cloned Calendar 
>> proxy, we do some processing to access the associated StateManager.  
>> But, that requires access to a Broker and there is no Broker 
>> associated with this cloned object and we end up throwing an 
>> IllegalStateException.  Due to that exception, the .equals() always 
>> returns false.
>> So, before I start experimenting with various fix strategies, I'm 
>> looking for some guidance from the original developers...
>> o  Should we override the clone() method?  And, if we do, 
>should we be 
>> returning a non-proxy version of a Calendar object?  Or, should we 
>> ensure that a fully populated Calendar proxy object get returned?
>> o  Or, should we think about overriding the .equals method on the 
>> Calendar proxies?  I'm not too thrilled with this since then 
>we'll be 
>> attempting to implement the javadoc for these object types.
>> Whatever we determine will probably apply to all of our proxy object 
>> types, even though we're only hitting this problem with the Calendar 
>> proxy due to the IBM JDK.
>> Thoughts or suggestions?
>> Kevin

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