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| Re: EMF EObject with JPA [message #1407884 is a reply to message #1407776] |
Wed, 13 August 2014 17:53   |
 Martin Taal
Messages: 5468
Registered: July 2009 |
Senior Member |
|
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Hi Marina,
Directly annotating EObjects won't work because EMF has its own list implementations, often JPA solutions also have
their own list implementations which collide with what EMF does/needs.
Some options:
You can try the Teneo project but it only works with Hibernate. https://wiki.eclipse.org/Teneo
Texo can also be used directly in your webcontainer, so no need to go through json serialization afaics. But there is a
conversion from EObjects to Texo objects and back, it makes use of the EMF proxy concept so it is somewhat transparent
for the EMF-using-code.
gr. Martin
On 13-08-14 14:28, Marina Knieling wrote:
> Hey guys,
>
> is it possible to annotate EObjects with JPA annotations? We're working in a JBoss environment and need to use EJB and
> JPA but we'd like to make use of the integrated undo/redo mechanism of the EMF EObjects. Using Texo on the server side
> and EMF on the client side as described in this thread (http://www.eclipse.org/forums/index.php/t/199296/) was my first
> idea, but serializing/deserializing the model and sending it back and forth is no real option (a similar approach has
> been discarded in our company not so long ago).
>
> So a colleague first had the idea to simply implement EObject but I think EMF is more than just EObject (thinking of the
> Package and Reflective API).
>
> Are there any other ideas on this use case or can I just annotate my EObjects with JPA annotations?
>
> Thanks for any hints or ideas on that
>
> Marina Knieling
--
With Regards, Martin Taal
Springsite/Elver.org
Office: Hardwareweg 4, 3821 BV Amersfoort
Postal: Nassaulaan 7, 3941 EC Doorn
The Netherlands
Cell: +31 (0)6 288 48 943
Tel: +31 (0)84 420 2397
Fax: +31 (0)84 225 9307
Mail: mtaal@xxxxxxxx - mtaal@xxxxxxxx
Web: www.springsite.com - www.elver.org
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| Re: EMF EObject with JPA [message #1408107 is a reply to message #1407884] |
Thu, 14 August 2014 08:41 |
Marina Knieling
Messages: 83
Registered: February 2013 |
Member |
|
|
Hi Martin,
in our environment we're using Hibernate as the JPA implementation. I've
worked with Teneo before, but only for a small project and not in
combination with any application server and so I wasn't aware of the
possibility to annotate models with JPA annotations.
Does that mean that I can 'simply' create the ecore model, add
annotations for JPA via EAnnotations (e.g. specifying column names) and
then this is equal/similar to writing POJOs and annotating them
manually? With the only difference that I now have EObjects instead of
normal Objects?
That sounds like a solution to me.
Thanks, Marina
On 13.08.2014 19:53, Martin Taal wrote:
> Hi Marina,
> Directly annotating EObjects won't work because EMF has its own list
> implementations, often JPA solutions also have their own list
> implementations which collide with what EMF does/needs.
>
> Some options:
> You can try the Teneo project but it only works with Hibernate.
> https://wiki.eclipse.org/Teneo
> Texo can also be used directly in your webcontainer, so no need to go
> through json serialization afaics. But there is a conversion from
> EObjects to Texo objects and back, it makes use of the EMF proxy concept
> so it is somewhat transparent for the EMF-using-code.
>
> gr. Martin
>
> On 13-08-14 14:28, Marina Knieling wrote:
>> Hey guys,
>>
>> is it possible to annotate EObjects with JPA annotations? We're
>> working in a JBoss environment and need to use EJB and
>> JPA but we'd like to make use of the integrated undo/redo mechanism of
>> the EMF EObjects. Using Texo on the server side
>> and EMF on the client side as described in this thread
>> (http://www.eclipse.org/forums/index.php/t/199296/) was my first
>> idea, but serializing/deserializing the model and sending it back and
>> forth is no real option (a similar approach has
>> been discarded in our company not so long ago).
>>
>> So a colleague first had the idea to simply implement EObject but I
>> think EMF is more than just EObject (thinking of the
>> Package and Reflective API).
>>
>> Are there any other ideas on this use case or can I just annotate my
>> EObjects with JPA annotations?
>>
>> Thanks for any hints or ideas on that
>>
>> Marina Knieling
>
>
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| Re: EMF EObject with JPA [message #1408253 is a reply to message #1408107] |
Thu, 14 August 2014 15:46 |
Martin Taal
Messages: 5468
Registered: July 2009 |
Senior Member |
|
|
Hey Marina,
Yes that's indeed how it works. Teneo only depends on a few of the EMF jars (and Hibernate):
https://wiki.eclipse.org/Teneo/Hibernate/Download_and_Install#Usage_in_a_Web_Container_-_Maven
gr. Martin
On 14-08-14 10:41, Marina Knieling wrote:
> Hi Martin,
>
> in our environment we're using Hibernate as the JPA implementation. I've worked with Teneo before, but only for a small
> project and not in combination with any application server and so I wasn't aware of the possibility to annotate models
> with JPA annotations.
>
> Does that mean that I can 'simply' create the ecore model, add annotations for JPA via EAnnotations (e.g. specifying
> column names) and then this is equal/similar to writing POJOs and annotating them manually? With the only difference
> that I now have EObjects instead of normal Objects?
>
> That sounds like a solution to me.
>
> Thanks, Marina
>
> On 13.08.2014 19:53, Martin Taal wrote:
>> Hi Marina,
>> Directly annotating EObjects won't work because EMF has its own list
>> implementations, often JPA solutions also have their own list
>> implementations which collide with what EMF does/needs.
>>
>> Some options:
>> You can try the Teneo project but it only works with Hibernate.
>> https://wiki.eclipse.org/Teneo
>> Texo can also be used directly in your webcontainer, so no need to go
>> through json serialization afaics. But there is a conversion from
>> EObjects to Texo objects and back, it makes use of the EMF proxy concept
>> so it is somewhat transparent for the EMF-using-code.
>>
>> gr. Martin
>>
>> On 13-08-14 14:28, Marina Knieling wrote:
>>> Hey guys,
>>>
>>> is it possible to annotate EObjects with JPA annotations? We're
>>> working in a JBoss environment and need to use EJB and
>>> JPA but we'd like to make use of the integrated undo/redo mechanism of
>>> the EMF EObjects. Using Texo on the server side
>>> and EMF on the client side as described in this thread
>>> (http://www.eclipse.org/forums/index.php/t/199296/) was my first
>>> idea, but serializing/deserializing the model and sending it back and
>>> forth is no real option (a similar approach has
>>> been discarded in our company not so long ago).
>>>
>>> So a colleague first had the idea to simply implement EObject but I
>>> think EMF is more than just EObject (thinking of the
>>> Package and Reflective API).
>>>
>>> Are there any other ideas on this use case or can I just annotate my
>>> EObjects with JPA annotations?
>>>
>>> Thanks for any hints or ideas on that
>>>
>>> Marina Knieling
>>
>>
>
--
With Regards, Martin Taal
Springsite/Elver.org
Office: Hardwareweg 4, 3821 BV Amersfoort
Postal: Nassaulaan 7, 3941 EC Doorn
The Netherlands
Cell: +31 (0)6 288 48 943
Tel: +31 (0)84 420 2397
Fax: +31 (0)84 225 9307
Mail: mtaal@xxxxxxxx - mtaal@xxxxxxxx
Web: www.springsite.com - www.elver.org
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