You can't auto-commit with JPA. If you want to remove the local transaction management, use JTA/CMT or Spring managed transactions.
As far as I know, OpenJPA uses the autocommit value from the underlying connection. BUT it explicitly sets autocommit to false whenever you begin a transaction. You can check the underlying connection with the following code: OpenJPAEntityManager oem = OpenJPAPersistence.
Cast(em); Connection conn = (Connection) oem.getConnection(); boolean autoCommit = conn.getAutoCommit().
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