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Scout And Hibernate [message #875671]

Wed, 23 May 2012 06:51

Panos Bariamis

Messages: 2
Registered: May 2012

Junior Member

Hi forum!

I would like to ask if it is a good idea to use hibernate with scout or use the SQL helper class provided by scout?

Has anyone use hibernate with scout before?

Is there a tutorial/example how it could be used?

Thanks,
Panos

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Re: Scout And Hibernate [message #875676 is a reply to message #875671]

Wed, 23 May 2012 07:03

Ivan Motsch

Messages: 154
Registered: March 2010

Senior Member

Using hibernate (or also eclipse link) is a good idea.

Scout itself is not bound to a certain persistence technology.

Scout offers convenience for those not choosing hibernate to being able to use database in an easy way. Therefore the scout sql service is considered as a convenience feature and not a mandatory feature.

Maybe one architectural hint: Use hibernate / jpa on the scout server side of your application, including services, lookup services etc.

But use the scout formdata form bean objects to communicate with the ui forms. That way you have a good separation between client/ui side and server side (ui layer vs. service layer).

[Updated on: Wed, 23 May 2012 07:04]

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Re: Scout And Hibernate [message #875681 is a reply to message #875676]

Wed, 23 May 2012 07:09

Panos Bariamis

Messages: 2
Registered: May 2012

Junior Member

Thanks Ivan for your answer.

Is there a manual explain how i could setup hibernate in scout and how to use it?

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Re: Scout And Hibernate [message #895612 is a reply to message #875681]

Fri, 13 July 2012 19:26

anirban c

Messages: 2
Registered: July 2012

Junior Member

Ivan,

I would be interested in hibernate support as well. If you have a few pointers where to start from ?
just started learning up on scout though

-anirban

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Re: Scout And Hibernate [message #896110 is a reply to message #895612]

Tue, 17 July 2012 09:42

Eclipse User

I'm working on a Scout Hibernate example. Check https://github.com/ahoegger/scout-hibernate-demo. Requires a Eclipse for Scout Developers featured with eGit from the Juno repository.

Help needed in:

Wiki HowTo, description
Hibernate KnowHow to have a valid reference implementation

Let me know if your need write access to the github repository.

-andreas

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Re: Scout And Hibernate [message #896254 is a reply to message #896110]

Tue, 17 July 2012 18:01

anirban c

Messages: 2
Registered: July 2012

Junior Member

thanks Andreas,

checking it out now and will give it a try with a ref impl with your example

-anirban

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Re: Scout And Hibernate [message #1060884 is a reply to message #896254]

Tue, 28 May 2013 20:21

Henrique Meira

Messages: 13
Registered: November 2012

Junior Member

Hello anirban.

Do you found any documentation, manual or tutorial to explain how to use the https://github.com/ahoegger/scout-hibernate-demo ?

I'm interested to use Scout with Hibernate, but I don't know how to start.

regards,

henrique.

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Re: Scout And Hibernate [message #1060987 is a reply to message #1060884]

Wed, 29 May 2013 12:27

Jeremie Bresson

Messages: 1252
Registered: October 2011

Senior Member

Hi Henrique,

Can you describe precisely your needs?
What are your blocking points?
- Have already Hibernate know-how?
- Have you enough know-how?

In my company, our main product (big scout based application) is using hibernate. It is in production! it is working.

We have started to build know-how in these domains (OSGi and Hibernate is also a big deal) and we will be happy to share.

Documenting "Scout+Hibernate" is on the roadmap, but it takes time. We will be happy to help if we can.

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Re: Scout And Hibernate [message #1061064 is a reply to message #1060987]

Wed, 29 May 2013 17:49

Henrique Meira

Messages: 13
Registered: November 2012

Junior Member

Quote:

Can you describe precisely your needs?

I'm designing a new software, medium sized, and will use the Scout. However, I would like to use a persistence layer with the database (JPA) instead of using SQL in the Java code (as learned on tutorial).

Analyzing the scout-hibernate-demo project, I understand that the Hibernate piece is an eclipse plugin (OSGi), but I don't know the procedure to perform this task (create a hibernate plugin).

So I thought if there was a manual about how the scout-hibernate-demo was created, I could understand how to integrate these two frameworks, Hibernate and Scout.

Quote:

What are your blocking points?
- Have already Hibernate know-how?
- Have you enough know-how?

Specifically on Hibernate I don't have in-depth know-how. My JPA knowledge was acquired with eclipse-link.

For right now I would like to understand how to integrate the these frameworks (Scout & Hibernate).

Quote:

In my company, our main product (big scout based application) is using hibernate. It is in production! it is working.

We have started to build know-how in these domains (OSGi and Hibernate is also a big deal) and we will be happy to share.

Documenting "Scout+Hibernate" is on the roadmap, but it takes time. We will be happy to help if we can.

Good to know that there is a real case using these technologies together.

Thank you for your attention. I'll be happy with any material on this topic.

I'll see the link to learn how to integrate OSGi and Hibernate.

regards,

henrique

[Updated on: Wed, 29 May 2013 20:43]

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Re: Scout And Hibernate [message #1061312 is a reply to message #1061064]

Fri, 31 May 2013 07:40

Rene Eigenheer

Messages: 109
Registered: July 2009

Senior Member

Henrique,

we had the same requirement, that we do not used the SQL mechanism as presented in the tutorials. In fact we use a classical multi tier backend (service layer, business layer, persistence layer). For each of the backend layers we have a "standard" Eclipse Java (Maven) project with the speciality that we add an OSGI manifest. This way we can use this backend functionality the same way as plugins.

For hibernate we build a wrapper project which makes out of the standard hibernate library a osgi bundle (see http://bndtools.org/ or the maven plugin org.apache.felix:maven-bundle-plugin). If you have experiences with EclipseLink it could be the easier way to use EclipseLink instead of Hibernate...this shouldn't change anything in the architecture).

We see the scout server part as part of the front-end and do not add any business logic or database access to it.

From the scout server we call the backend with a factory method BACKEND,getService() to have the same mechanism as Scout Client uses to call Scout Server SERVICES.getService(). The service calls the business layer and business layer calls the persistence layer (DAO) which accesses the database using Hibernate.

Furthermore we have a "model" project where we have defined all the domain model classes which are mapped to database tables. We try directly to use these model classes as DTO and use them across all layers - also in the scout client.

Hope his gives you some ideas.

Rene

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Re: Scout And Hibernate [message #1061408 is a reply to message #1061312]

Fri, 31 May 2013 13:51

Henrique Meira

Messages: 13
Registered: November 2012

Junior Member

Thank you René.

I liked your concept.

But, how do you integrates the hibernate osgi bundled with the scout?

Do you add a dependency in plugin.xml under server package?

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Re: Scout And Hibernate [message #1061423 is a reply to message #1061408]

Fri, 31 May 2013 14:42

Jeremie Bresson

Messages: 1252
Registered: October 2011

Senior Member

There is no Hibernate OSGi bundle at the moment. From what I understood the hibernate jars are not OSGi bundles (see HHH-7527). However you can add them in an OSGi bundle.

That what we do in org.hibernate4.lib.fragment. The idea of this fragment is that the dependency to hibernate might also be provided by your application server if you prefer.

The plugin org.hibernate4.osgi is about fixing Hibernate to run in an OSGi environment (From what I understood, you need to change some classloader stuff. See also this interview: JBoss Releases Hibernate 4.0, answer to the question "How important is OSGI for you? How close is Hibernate to full OSGI support?").

I hope this helps.

(do not hesitate to ask until you have understood. I do not have so much knowledge myself, but I can ask around).

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Re: Scout And Hibernate [message #1061444 is a reply to message #1061408]

Fri, 31 May 2013 16:05

Rene Eigenheer

Messages: 109
Registered: July 2009

Senior Member

Henrique Meira wrote on Fri, 31 May 2013 09:51

Do you add a dependency in plugin.xml under server package?

in the plugin.xml of the scout server package I add only a dependency on my backend service bundle, as I do not want, that the scout server has a direct access to my DAO and to hibernate.

simplified:

Scout server plugin.xml
Bundle-Name: org.example.scout.myapp.server
Require-Bundle: org.example.myapp.service,org.example.myapp.model

Backend Service bundle
Bundle-Name: org.example.scout.myapp.service
Require-Bundle: org.example.myapp.business,org.example.myapp.model

Backend Business bundle
Bundle-Name: org.example.scout.myapp.business
Require-Bundle: org.example.myapp.persistence,org.example.myapp.model

Backend Persistence bundle
Bundle-Name: org.example.scout.myapp.peristence
Require-Bundle: org.example.myhibernate,org.example.myapp.model
Eclipse-RegisterBuddy: org.example.myhibernate

MyHibernate Bundle (osgi wrapper for hibernate library)
Bundle-Name: org.example.myhibernate
Bundle-ClassPath: jars/hibernatexxxx.jar ....
Export-Package: org.hibernate.xxxx ....
Eclipse-BuddyPolicy: registered

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