@Entity public class Person { @Id private long id; private String name; } <persistence-unit name="objectdb-unit" transaction-type="RESOURCE_LOCAL"> <provider>com.objectdb.jpa.Provider</provider> <class>Person</class> <properties> <property name="javax.persistence.jdbc.url" value="objectdb:$objectdb/db/person.odb"/> </properties> </persistence-unit> EntityManagerFactory emf = Persistence.createEntityManagerFactory("objectdb-unit"); EntityManager em = emf.createEntityManager(); EntityTransaction tx = em.getTransaction(); Person person = new Person(); person.setId(1);