You could write a custom field serializer for java.sql.Date.  Serialize the 
information you need to recreate with the fidelity required for your use 
case.

On Thursday, July 23, 2020 at 10:17:25 AM UTC-4 ralph.f...@gmail.com wrote:

> I know it is quite some time ago since you posted this, but I just now 
> (2020!) ran into the very same issue (using the very same workaraound). Is 
> there any real solution for this by now?
>
>
> On Tuesday, August 22, 2006 at 2:32:24 AM UTC+2, StudyBlue wrote:
>>
>> Casting 'non-serializable' objects to 'serializable' objects alone is
>> not enough!
>>
>> 1.  According to the serialization documentation for the GWT,
>> java.util.Date is serializable.
>> (
>>
>> http://code.google.com/webtoolkit/documentation/com.google.gwt.doc.DeveloperGuide.RemoteProcedureCalls.SerializableTypes.html
>> )
>> 2.  According to the java docs, java.sql.Date is a subclass of
>> java.util.Date.
>> ( http://java.sun.com/j2se/1.5.0/docs/api/java/sql/Date.html )
>> 3.  According to you-can-look-it-up-yourself you can validly cast a
>> subclass to the type of the superclass.
>>
>> Intuitively, you should be able to send java.sql.Dates across the RPC
>> boundary simply by casting them.  Unfortunately, the reflection calls
>> appear to look for the most specific type possible, not necessarily
>> whatever it was cast to last.  (Maybe that's intended.  Maybe I'm
>> totally off on my blind guess for what's causing this.)  No matter how
>> I cast I java.sql.Date to java.util.Date, the call would always throw
>> an exception claiming I was trying to send a java.sql.Date.  Eventually
>> I got fed up with that and created a new java.util.Date from the
>> java.sql.Date's getTime() method.  Creating an entirely new object
>> solved the problem, but I'm assuming that's taking more time and
>> processing than a simple cast.  If there's any way to make a sufficient
>> cast, I'd love to hear it.
>>
>>

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