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From Andrus Adamchik <>
Subject Re: Pointers for JPA integration tutorial
Date Sat, 01 Sep 2007 17:20:38 GMT
Ok, I found why relationships didn't work - Cayenne enhancer looked  
at the getters/setters for the persistence fields to do enhancement.  
I will be working on fixing this [1], but you can still play with the  
relationships in the meantime (as long as you declare simple getters/ 
setters). I just uploaded a new version of the tutorial [2]. Will get  
to work on fixing the enhancer now.

Does it mean the JPA provider already reached the elusive Alpha?  
Probably not. The criteria for that is vague, but I still feel like  
we need to fix CAY-858 and do some serious testing first.



P.S. From the tutorial writing experience... Vanilla JPA feels like a  
step back to me as a user, compared to Cayenne API (What? I need to  
set/unset both sides of relationship by hand? I need to manage  

On Aug 28, 2007, at 2:52 PM, Andrus Adamchik wrote:

> Hi Shannon,
> let me better investigate the scope in the next couple of days.
> Andrus
> On Aug 27, 2007, at 5:32 PM, wrote:
>> Andrus,
>> Thanks so much!!!!  Do you have a feel for when you will have the
>> enhancer bug fixed (yeh, I'd call that a big one B-) ) and the JPA
>> provider will be ready for Alpha?
>> Shannon
>> -----Original Message-----
>> From: Andrus Adamchik []
>> Sent: Saturday, August 25, 2007 2:58 PM
>> To:
>> Subject: Re: Pointers for JPA integration tutorial
>> Hi Shannon,
>> the reason for the absent tutorial is that the JPA provider is still
>> work in progress, and we need to plug a few holes in the provider
>> before it can be considered Alpha and ready for experimentation. But
>> I decided to write one anyways :-)
>> tutorial.tar.gz
>> See the README.txt file inside the archive for details. Unlike other
>> Cayenne tutorials it doesn't have a Modeler in the picture (following
>> JPA philosophy of modeling persistence straight in the code via
>> annotations). So you'd have to run the schema generation script via
>> "ij" Derby tool (see README.txt again), and then fire up the app from
>> Eclipse. Also note that the tutorial includes the latest Cayenne
>> build from trunk which, compared to 3.0M1, has *much* more capable
>> EJBQL engine and also fixes a bunch of bugs.
>> Now the holes I mentioned above. The main one that I can think of
>> right now is an enhancer bug that prevents relationships use (doh!
>> that's a big one). I guess once that's fixed, we can declare the
>> provider to be in the usable alpha state.
>> Cheers,
>> Andrus
>> On Aug 24, 2007, at 11:09 PM, wrote:
>>> Hi all,
>>> I am new to both Cayenne and the JPA and trying to get a basic test
>>> running with Cayenne 3.0M  and Derby. I have worked through the
>>> Cayenne
>>> tutorial in the quick start, but it does not have any info on how to
>>> model, generate Objects and then work with the JPA.  I was hoping
>>> someone could point me at a little tutorial or some demo code that
>>> would
>>> help me get started.
>>> Thanks,
>>> Shannon

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