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javax.persistence.EntityManagerFactory; import javax.persistence.FetchType; import javax ... createEntityManager(String dbFileName, boolean delete) {   EntityManagerFactory emf = null;  

.EntityManagerFactory; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType ... ;             EntityManagerFactory emf

.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.FetchType; import ... ; EntityManagerFactory emf = null;   if (delete) {    new File(dbFileName).delete

;EntityManagerFactory emf =         Persistence.createEntityManagerFactory ... :     EntityManagerFactory emf =   

() { EntityManagerFactory emf = Persistence.createEntityManagerFactory("target/test.odb;drop"); EntityManager em ... ;     EntityManagerFactory emf =         

> and here is the interesting part of JDODatabase: private EntityManagerFactory emf; private EntityManagerFactory getEntityManagerFactory() {   if(emf == null) {   

.EntityManagerFactory; import javax.persistence.LockModeType; import javax.persistence.Persistence ... void main(String[] args) {         EntityManagerFactory emf

; import javax.persistence.EntityManagerFactory; import javax.persistence.GeneratedValue; import javax ... @GeneratedValue protected int id; @Version protected long version; @Transient protected EntityManagerFactory

">EntityManagerFactory and enable  lazy loading) - until serialization, which completes ... ");         EntityManagerFactory emf =     

of the EntityManagerFactory and each thread has its own instance of EntityManager.  After 500 persists ... ; factory.close(); After 3 minutes the EntityManagerFactory