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From: Andrus Adamchik <andrus@objectstyle.org>
Subject: Re: Cayenne POJO enhancer
Date: Thu, 25 Oct 2007 17:58:59 +0300
To: user@cayenne.apache.org


On Oct 25, 2007, at 6:39 PM, Gilberto C Andrade wrote:

> So, this is a good chance to help cayenne. Or are you suggesting  
> another
> one (OpenJPA, Hibernate, TopLink, etc).

Hehe, of course I'll suggest to help Cayenne, but you've been warned ;-)

In other words if that's an offer to work together with Cayenne  
developers to address the things missing or broken in the JPA  
provider, we will gladly accept such help.


> But, I can map those pojos to jpa config file by hand, can't I?

I am not a Hibernate expert, so I don't know if there's one-to-one  
mapping between Hibernate and JPA annotations across the board. But  
it appears that there is at least a close match. From your example:

Hibernate:

@hibernate.id generator-class="sequence" column="cdarea" unsaved- 
value = "null"
@hibernate.generator-param name = "sequence" value =  
"scc.scc_area_sequence"

JPA:

@SequenceGenerator(name="scc_area_sequence",  
sequenceName="scc.scc_area_sequence")


Unfortunately this is also an example of an annotation currently  
ignored by Cayenne provider (i.e. the one that still needs to be  
bridged with Cayenne runtime), so that gives a glimpse of the  
limitations you'll have to deal with.

As for the documentation, I suggest the JPA spec [1] for the full  
list of annotations. There's also a number of recent books on EJB3  
and more specifically JPA.

Andrus

[1] http://jcp.org/en/jsr/detail?id=220