Programmatical EntityManagerFactory init

[Erwan Le Goulven]

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