Can be toplink-essentials.jar and toplink-essentials-agent.jar shared ?

Question

I have 2 apps, A and B, toplink-essentials.jar and toplink-essentials-agent.jar are not in their war /lib directory. It is in /common/lib (Tomcat 5.5) or /toplink/jlib (OC4J 10.1.3.2.0).
First I deploy and run A - it works, then I deploy and run B - it fails with exception: No Persistence provider for EntityManager named ...
When I do it in opposite sequence, B works ok, A fails.
When I add toplink-essentials.jar and toplink-essentials-agent.jar into war /lib, both works OK, but only on Tomcat. On OC4J not. Itried to add orion-web.xml
<orion-web-app>
<web-app-class-loader search-local-classes-first="true"/>
</orion-web-app>
but without success. Second application still failed.
Can be toplink jars shared between applications ?
Tested with build 41
Lumir

Answer 1

Note: The agent JAR is only needed when starting a
client outside the container.Yes, I kow it - but I am confused, that OC4J /toplink/jlib contain agent, and tutorial at
http://www.oracle.com/technology/products/ias/toplink/jpa/examples/jsf-jpa-example.html#CHDDIFII
also say: Add toplink-essentials.jar and toplink-essentials-agent.jar to <EXAMPLE_HOME>\lib.
Is there any more information in the stack trace that
might help figure out why the second persistence unit
cannot be initialized?javax.persistence.PersistenceException: No Persistence provider for EntityManager named xxx
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
Are you setting up any TopLink session configuration
properties in your persistence unit (i.e.
toplink.session-name)?No. I have only session customizer, that does following in customize()
JNDIConnector connector = (JNDIConnector) session.getLogin().getConnector();
connector.setLookupType(JNDIConnector.STRING_LOOKUP);          
session.getLogin().setTableQualifier(schema);
Bye,
Lumir