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Weird problems while saving and reading Calendar in jpa [message #905575]

Thu, 30 August 2012 13:03

Eclipse User

I am running in weird situation with java Calendar in jpa. The problem is while saving and reading back java.Calendar I not getting consistent date?

Re: Weird problems while saving and reading Calendar in jpa [message #905577 is a reply to message #905575]

Thu, 30 August 2012 13:05

Eclipse User

The problem was in caching of entities . So I disabled caching by using the following annotation on entities :

@Cacheable(false)

I used that annotation on entities with java.Calendar field

Re: Weird problems while saving and reading Calendar in jpa [message #905661 is a reply to message #905577]

Thu, 30 August 2012 16:34

Eclipse User

Calendars are scary things, because they are mutable.

Tom

On 2012-08-30 19:05, Khurshed Salimov wrote:
> The problem was in caching of entities . So I disabled caching by using the following annotation on entities :
>
> @Cacheable(false)
>
> I used that annotation on entities with java.Calendar field

Re: Weird problems while saving and reading Calendar in jpa [message #909039 is a reply to message #905661]

Thu, 06 September 2012 08:56

Eclipse User

You could also try the persistence unit property,

"eclipselink.temporal.mutable"="true"

Re: Weird problems while saving and reading Calendar in jpa [message #912543 is a reply to message #905577]

Thu, 13 September 2012 14:39

Eclipse User

java.util.Date fields have this problem too?

Re: Weird problems while saving and reading Calendar in jpa [message #916058 is a reply to message #912543]

Tue, 18 September 2012 09:17

Eclipse User

The method on java.util.Date are mainly deprecated, so should not have this issue. In general, you should ensure you create a new Date/Calendar for a new Date/Calendar, not modify the existing one.

Re: Weird problems while saving and reading Calendar in jpa [message #962625 is a reply to message #905575]

Mon, 29 October 2012 03:52

Eclipse User

"eclipselink.temporal.mutable"="true" only makes changes to mutable data or Calendar to be able to track by persistence context. But problem was in shared cache. Because when inserting entity it will added to shared cache and while reading back from shared cache copy of calendar is created. That is the real cause of problem since here we are making new copy of calendar instance not building new one after executing database query.

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