how to set auto_commit true in jpa?

[Joseph Hwang]

I try to use jpa in google cloud sql.This is my source.

 

== persistence.xml ==

<persistence-unit name="transactions-optional">
            <provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider>
           
            <properties>           
                  <property name="datanucleus.NontransactionalRead" value="true"/>
                  <property name="datanucleus.NontransactionalWrite" value="true"/>
                  <property name="datanucleus.ConnectionURL" value="appengine"/>
            </properties>
 </persistence-unit>

 

== EMFService ==

public class EMFService {
 private static final EntityManagerFactory emfInstance = Persistence.createEntityManagerFactory("transactions-optional");
 
 private EMFService() {    }    
 public static EntityManagerFactory get() {       
  return emfInstance;
 }
}

 

== Implemetation java source ==

EntityManager em = EMFService.get().createEntityManager();

Members ma = new Members(); // This is Entity class
  ma.setID("aaa");
  ma.setPasswd("ccc");
  ma.setName("vvv");

  em.persist(ma);
  
  Members m = em.find(Members.class, "aaa");

 

if( m.equals(ma)) // this statement returns true value.

But statement does not commit the value. I can't find the ma object value in database records.

Pls, advise me how to set auto_commit in persistence.xml. Thanks in advanced!