Accessing the Session in Toplink Essentials

Question

I try access session by this way:
http://ontoplink.blogspot.com/2007/01/accessing-session-in-toplink-essentials.html
and get exception:
(Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Could not find the session with the name [my_name] in the session.xml file []
Is session.xml needed for this ? I hope not, because it requires project.xml and it maybe require some another... All what I need is:
session.getEventManager().addListener(myEventListener);
to force toplink switch database schema in listener preLogin method. In Hibernate, it can be done by one line in config file.
Lumir

Answer 1

OK, I tried obtain session BEFORE creating EntityManagerFactory and EntityManager.
Now when obtaining it AFTER creating EMF and EM, it works.
But this not solve problem with change db schema, because AFTER create EMF and EM, session is logged in and EventListener preLogin isn't called.
Can anyone point me, how to change db schema ? I know it for connection defined using toplink.jdbc.* properties, but not for JNDI:
public class ToplinkSessionCustomizer implements SessionCustomizer
public void customize(Session session) throws Exception
          if(jdbcUrl == null)
               // JDBC URL is not set, assume JNDI lookup
               JNDIConnector connector = (JNDIConnector) session.getLogin().getConnector();
               connector.setLookupType(JNDIConnector.STRING_LOOKUP);
               // 1. Not works, cause NPE
               // at oracle.toplink.essentials.descriptors.ClassDescriptor.verifyTableQualifiers(ClassDescriptor.java:3518)
               session.getDatasourcePlatform().setTableQualifier(schema);
               SessionEventAdapter preLoginEventListener = new SessionEventAdapter()
               // Listen for preLogin events
                    public void preLogin(SessionEvent event)
                    event.getSession().getLogin().setTableQualifier("myschema");
               // 2. Not works, eventManager is null, cause NPE !
               session.getEventManager().addListener(preLoginEventListener);
          else
// This works OK
               DatabaseLogin login = session.getLogin();
               login.useOracleThinJDBCDriver();
               login.setDatabaseURL(jdbcUrl);
               login.setUserName(userName);
               login.setPassword(password);
               login.setTableQualifier(schema);
     }