eclipselink connection pooling

Question

If connection pooling is not defined in the persistence.xml for eclipse link, what is the default behavior?

Will it open and close a JDBC connection for every trans

Answer 1

Just wanted to provide the code source for James' answer above: You can see that a default connection pool is created in the constructors of ServerSession, using the init/min/max defaults defined in ConnectionPool, and optionally overridden/adjusted by the developer via properties in EntityManagerSetupImpl.