1. You PU name is "PU_4" not "persistence/PU_4" as you pass to the createEMF call.
2. While in theory it can be possible to pass in a Map of overrides to the createEMF call, TopLink currently doesn't support 2 EMFs in the same VM with different properties.
Regards,
-marina
[Message sent by forum member 'mvatkina' (mvatkina)]
http://forums.java.net/jive/thread.jspa?messageID=228421