I'm doing a school project with objectdb and glassfish. I have tried your web tutorial "Java EE JPA (Glassfish) with Netbeans".
When I try to run the example and add an entry in the guestbook, it throws this exception:
com.objectdb.o._PersistenceException: Attempt to obtain a connection from a closed EntityManagerFactory
I have tried Open source and Oracle Glassfish server with the same result.
I'm using 64-bit jdk1.7.0_03
Do you have any suggestion how to solve the exception ?