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using EclipseLink as JPA 2.0 provider, I can obtain a JDBC connection by simply calling
Connection con = entityManager.unwrap(Connection.class);
But I'm unsure what I'm responsible for. Do I have to close the connection after submitting my queries? Or are I'm not allowed to close the connection, because EclipseLink also uses this connection internally. Or does it not care, because EclipseLink observes my behaviour and closes the connection automatically if I don't do it?