Hi,

I am developing an app where one of my entities needs a more specialized Date object that I've implemented through inheritance.
The problem though, is that Hibernate does not accept it. It throws the following exception on initialization:



Has anyone had this same issue?? Has anyone any nice workaroud?
I believe that Hibernate team should make it possible to use subclasses of Date.

Thanks in advance,
Vitor.

Is your specialized Date adding any data, or just behaviour?

i.e. do you need to persist anything different from a plain Date?


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Stephen Souness

Hi Stephen,

My specialized Date only adds behavior to the application.
It should be stored as a plain Date in the database.

Actually, it doesn't have any behavior at all. I just extend Date class.
I am using it, so that I can use a custom field serializer with GWT. By making this custom Date, I can control the serialization/deserialization process when it finds this specialized class of mine.

In my application, I have two types of dates: one that should use time zones, and another one that shouldn't.

So, when serializing/deserializing the one that shouldn't (my specialized Date), I need control of this process to make the dates equal in both time zones if the server and client have different time zones.

For example, if the client is in eastern US (-5h) and the server is in Germany (+1h). When the client sends a date at 14h, that same date would be 20h in the server. So I would have to decrease 6 hours to make them equal.

Well, I hope you understand the reason why I need a specialized Date class.

Regards,
Vitor.

You could try having your date field declared as a java.util.Date with the Temporal annotation, then provide accessor methods for GWT to use your customized Date - which would presumable be able to simply decorate the Date.


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Stephen Souness

Thanks Stephen,

It worked just fine! I don't know why I didn't think of this before.
Here is how I did it:



Now Hibernate thinks it is a normal Date, and GWT sees it as a LocalDate during serialization/deserialization.

Regards,
Vitor.