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Subject: RE: Programmatical EntityManagerFactory init
Date: Fri, 6 Apr 2007 10:07:37 -0700
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Thread-Topic: Programmatical EntityManagerFactory init
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From: "Patrick Linskey" <plinskey@bea.com>
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> Could you (or anyone else) confirm this last point?

Your are correct -- when using the Persistence class for bootstrapping,
you must provide a name of a persistence unit defined in XML.

To create an EMF programmatically in a standards-based way, you should
use the classes and interfaces in javax.persistence.spi. Create an
implementation of PersistenceUnitInfo
(http://java.sun.com/javaee/5/docs/api/javax/persistence/spi/Persistence
UnitInfo.html), then instantiate the PersistenceProvider for the
implementation of your choice (this is the bit that goes into the
<provider> tag in the persistence.xml file).

So, for OpenJPA, you would create your PersistenceUnitInfo, and then do
something like so:

PersistenceUnitInfo pui = ...;
PersistenceProvider pp = new
org.apache.openjpa.persistence.PersistenceProviderImpl();
EntityManagerFactory emf = pp.createEntityManagerFactory("foo", null);

The above code assumes that you've configured all your properties in the
PersistenceUnitInfo, and so is passing 'null' in as the map parameter to
createEntityManagerFactory().

If you don't want to implement the PersistenceUnitInfo interface on your
own, you can use OpenJPA's (which is pretty general-purpose, but does
have some OpenJPA-specific helper methods in it):

PersistenceUnitInfo pui = new
org.apache.openjpa.persistence.PersistenceUnitInfoImpl();
pui.setPersistenceUnitName("foo");
pui.setProperty("key", "value");

HTH,

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

_______________________________________________________________________
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> -----Original Message-----
> From: Erwan Le Goulven [mailto:erwan.legoulven@gmail.com] 
> Sent: Friday, April 06, 2007 9:50 AM
> To: open-jpa-dev@incubator.apache.org
> Subject: Re: Programmatical EntityManagerFactory init
> 
> Thank you for your time Patrik,
> 
> Actually the persistence.xml used in the META-INF jar in the 
> CP points to
> another persistence unit name.
> The thing is -and I may be mistaking about this practice- I want to
> programmatically my own persistence units, based on different 
> name, at run
> time, and I dunnot wish do depend on persistence.xml 
> descriptor to configure
> the persistence units I wish to use, because :
> -I don't know their number
> -I don't know their name
> 
> I thought I could use the Map property provided by the 
> Persistence api in
> order to proceed, but I'm now questionning about its faisability. I've
> checked out the source code and noticed the persistence.xml 
> resource is
> searched, whatever property I put in the configuration map.
> 
> Could you (or anyone else) confirm this last point?
> 
> Merci bien
> Erwan
> 2007/4/6, Patrick Linskey <plinskey@bea.com>:
> >
> > > Note :
> > > I'm using a persistence.xml for single persitence unit
> > > creation, and this
> > > test works fine. I've had a dive into the source code, 
> and found the
> > > provider is lookuped and found by the glassfish persistence
> > > implementation
> > > class. The exception is raised on the open jpa side, and I
> > > know I'm missing
> > > some configuration elements, but I cannot guess what's missing?
> > > any hint?
> >
> > The only exception that I see in the trace you gave us is 
> thrown by the
> > spec implementation jar. I'm not looking at the source for 
> that code,
> > but my guess would be that the failure is happening because of a
> > classpath error, such that OpenJPA is not available in the 
> classloader
> > that is visible to the Persistence class.
> >
> > Could you post your persistence.xml file and any details 
> about how your
> > classloader structure is set up?
> >
> > Thanks,
> >
> > -Patrick
> >
> > --
> > Patrick Linskey
> > BEA Systems, Inc.
> >
> > 
> ______________________________________________________________
> _________
> > Notice:  This email message, together with any attachments, 
> may contain
> > information  of  BEA Systems,  Inc.,  its subsidiaries  and 
>  affiliated
> > entities,  that may be confidential,  proprietary,  
> copyrighted  and/or
> > legally privileged, and is intended solely for the use of 
> the individual
> > or entity named in this message. If you are not the 
> intended recipient,
> > and have received this message in error, please immediately 
> return this
> > by email and then delete it.
> >
> > > -----Original Message-----
> > > From: Erwan Le Goulven [mailto:erwan.legoulven@gmail.com]
> > > Sent: Friday, April 06, 2007 4:46 AM
> > > To: open-jpa-dev@incubator.apache.org
> > > Subject: Programmatical EntityManagerFactory init
> > >
> > > Messieurs-dames,
> > >
> > > As I could not find much clues about the right way to do it,
> > > here I come:
> > > I'm trying to get an EntityManagerFactory properly setup from the
> > > Persistence class, but I cannot get further than the
> > > following exception
> > >
> > > javax.persistence.PersistenceException: No Persistence 
> provider for
> > > EntityManager named teamplay_test
> > >     at javax.persistence.Persistence.createEntityManagerFactory(
> > > Persistence.java:89)
> > >     at
> > > com.gdteam.teamplay.domain.manager.TeamplayEMFactoryManager.get(
> > > TeamplayEMFactoryManager.java:60)
> > >     at 
> com.gdteam.teamplay.test.persistence.PersistenceUtilTest.setUp(
> > > PersistenceUtilTest.java:19)
> > >     at junit.framework.TestCase.runBare(TestCase.java:125)
> > >     at junit.framework.TestResult$1.protect(TestResult.java:106)
> > >     at 
> junit.framework.TestResult.runProtected(TestResult.java:124)
> > >     at junit.framework.TestResult.run(TestResult.java:109)
> > >     at junit.framework.TestCase.run(TestCase.java:118)
> > >     at junit.framework.TestSuite.runTest(TestSuite.java:208)
> > >     at junit.framework.TestSuite.run(TestSuite.java:203)
> > >
> > > Here is the code part that leads to the exception:
> > >
> > > public class TeamplayEMFactoryManager  {
> > > ...
> > >     private final Map<String, String> props = new
> > > HashMap<String, String>();
> > >     private final Map<String, EntityManagerFactory> map = new
> > > HashMap<String, EntityManagerFactory>();
> > > ...
> > >     private TeamplayEMFactoryManager() {
> > >         props.put("openjpa.ConnectionDriverName",
> > > "org.hsqldb.jdbcDriver");
> > >         props.put("openjpa.ConnectionUserName", "sa");
> > >         props.put("openjpa.ConnectionPassword", "");
> > >         props.put("openjpa.Log", "DefaultLevel=WARN, Tool=INFO");
> > >         props.put("openjpa.MetaDataFactory",
> > > "jpa(Types="+buildTypes()+")");
> > >     }
> > >
> > > ..
> > >
> > > public EntityManagerFactory get(String url) {
> > >
> > >         EntityManagerFactory factory = null;
> > >
> > >         if (null == url || url.length() == 0 ) {
> > >             url = "default";
> > >         }
> > >
> > >         factory = this.map.get(url);
> > >
> > >         if (null == factory) {
> > >             if ( "default".equals(url)) {
> > >  1-               factory =
> > > Persistence.createEntityManagerFactory(null);
> > >             } else {
> > >                 Map<String , String> map = new HashMap<String,
> > > String>(props);
> > >                 map.put("openjpa.ConnectionURL", buildUrl(url));
> > >  2-              factory =
> > > Persistence.createEntityManagerFactory(url,map);
> > >             }
> > >             this.map.put(url, factory);
> > >         }
> > >         return factory;
> > >     }
> > > ...
> > > }
> > >
> > >
> > > Note :
> > > I'm using a persistence.xml for single persitence unit
> > > creation, and this
> > > test works fine. I've had a dive into the source code, 
> and found the
> > > provider is lookuped and found by the glassfish persistence
> > > implementation
> > > class. The exception is raised on the open jpa side, and I
> > > know I'm missing
> > > some configuration elements, but I cannot guess what's missing?
> > > any hint?
> > >
> > > thank you guys
> > >
> >
> > Notice:  This email message, together with any attachments, 
> may contain
> > information  of  BEA Systems,  Inc.,  its subsidiaries  and 
>  affiliated
> > entities,  that may be confidential,  proprietary,  
> copyrighted  and/or
> > legally privileged, and is intended solely for the use of 
> the individual or
> > entity named in this message. If you are not the intended 
> recipient, and
> > have received this message in error, please immediately 
> return this by email
> > and then delete it.
> >
> 

Notice:  This email message, together with any attachments, may contain information  of  BEA Systems,  Inc.,  its subsidiaries  and  affiliated entities,  that may be confidential,  proprietary,  copyrighted  and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.