Eclipse Community Forums: Gemini » [gemini jpa] Gemini JPA in an OSGI service

Home » Eclipse Projects » Gemini » [gemini jpa] Gemini JPA in an OSGI service

[gemini jpa] Gemini JPA in an OSGI service [message #701027]

Sun, 24 July 2011 09:17

Eclipse User

Hi,

I have an application (RAP) that uses eclipse link without any major issues. Now I'd like to change my implementation to use gemini jpa (without dbaccess). All my persistence actions and entities are part of a custom bundle that provides an OSGI service (declarative). How can this service access the EntityManagerFactory?

I downloaded gemini jpa and added the two jars to my target platform. I also removed the org.eclipse.persistence.jpa.osgi bundle. Now I start my application and type ls to see all available services, but no EntityManagerFactory is there. Shouldn't there be a registered service per punit? (Also getting a service reference from the bundle context using the EntityManagerFactory.class is no successful.)

Maybe I got something wrong. Any help is welcome.

Thanks.

Karsten

Re: [gemini jpa] Gemini JPA in an OSGI service [message #701725 is a reply to message #701027]

Mon, 25 July 2011 09:46

Eclipse User

Hi Karsten,

I just noticed that the Gemini JPA tests all assume DBAccess so it's possible that support for accessing the driver directly got broken along the way somewhere. While I check on this and add a proper test for it, perhaps you can give some more details about the versions you are using and the arch of your app, etc? Could you please indicate:

- version of EclipseLink you are using
- version of Gemini JPA
- an idea of the relevant bundles in the system and what is in them:
- the client bundle (trying to access the EMF)
- where your JDBC driver is configured/bundled
- where your entities and persistence.xml are bundled

I'm sure we'll be able to get you going before too long Smile

Thanks!

-Mike

Re: [gemini jpa] Gemini JPA in an OSGI service [message #724857 is a reply to message #701725]

Tue, 13 September 2011 07:09

Eclipse User

Hi,

I got a similar issue. Currently I'm using
* DBAccess RC1
* Gemini JPA RC1
* EclipseLink 2.3.0
* Eclipse 3.6.2

I have a declarative service and I'm defining a service reference to "EntityManagerFactoryBuilder". On startup this message comes up:

Quote:

!ENTRY de.lmu.ifi.dbs.medmon.medic.core 4 0 2011-09-13 13:00:46.214
!MESSAGE [SCR] Error while trying to bind reference Reference[name = EntityManagerFactoryBuilder, interface = org.osgi.service.jpa.EntityManagerFactoryBuilder, policy = static, cardinality = 0..n, target = null, bind = bindEntityManagerFactoryBuilder, unbind = unbindEntityManagerFactoryBuilder]
Details:
Problematic reference = Reference[name = EntityManagerFactoryBuilder, interface = org.osgi.service.jpa.EntityManagerFactoryBuilder, policy = static, cardinality = 0..n, target = null, bind = bindEntityManagerFactoryBuilder, unbind = unbindEntityManagerFactoryBuilder]
of service component = de.lmu.ifi.dbs.medmon.medic.core.SensorService
component implementation class = de.lmu.ifi.dbs.medmon.medic.core.sensor.SensorService
located in bundle with symbolic name = de.lmu.ifi.dbs.medmon.medic.core
bundle location = reference:file:/home/muki/Development/workspace_medmon/Medmon/de.lmu.ifi.dbs.medmon.medic.core/

What does this "problematic reference" mean? I'm trying to change to the newer versions (Eclipse 3.7, DBAccess RC1, Gemini JPA RC3) and report if the error still occurs.

cheers,
Muki

Re: [gemini jpa] Gemini JPA in an OSGI service [message #724895 is a reply to message #701725]

Tue, 13 September 2011 08:57

Eclipse User

Hi,

It works fine with the EntityManagerFactoryBuilder, however there's no EntityManagerFactory?! When I look via "services" in the OSGi console, I can only find EntityManagerFactoryBuilder and org.osgi.service.jdbc.DataSourceFactory (4x, two EmbeddedDriver, two clientDriver). However I can connect to the database!

My configuration

- Eclipse 3.7.0
- EclipseLink 2.3.0
- Gemini JPA 1.0.0.RC3
- Gemini DBAccess 1.0.0.RC2
- osgi.enterprise_4.2.0

My declarative service is located in another bundle, than the model and the PU.

cheers,
Muki

[Updated on: Tue, 13 September 2011 08:58] by Moderator

Re: [gemini jpa] Gemini JPA in an OSGI service [message #725496 is a reply to message #724895]

Wed, 14 September 2011 20:30

Eclipse User

Does the EMF get registered later on after everything has been started and settled down? If so then it is possible that the DataSourceFactory is not registered by DBAccess until after Gemini starts processing the persistence bundle. If the start order ends up causing the Gemini bundle to get started before the DBAccess bundle then the DSF will not be there yet, and if there is no DSF when Gemini processes the persistence unit then Gemini will not register an EMF but go ahead and register an EMFBuilder.

In any case, set the debug flag by adding the GEMINI_DEBUG system property to the Java command line:
java -DGEMINI_DEBUG=true

This should help you to see what is happening.

Re: [gemini jpa] Gemini JPA in an OSGI service [message #725618 is a reply to message #725496]

Thu, 15 September 2011 07:10

Eclipse User

Hi,

Thanks for the debugging hint. It was a silly fault Sad

, didn't give any JDBC driver class in the
persistence.xml.

-Muki

Previous Topic:	Gemini Web Maya (2.0) Download Available
Next Topic:	Establish Connection using sql server with eclipse Helios

Goto Forum:

-=] Back to Top [=-

Current Time: Thu Jul 10 01:24:02 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter