@Named
@RequestScoped
public class MainController implements Serializable {

    @EJB
    private ParentFacade parentFacade;
   
    public void createParentList(String count) {
        System.out.println("-------Start---------");
        long start = System.currentTimeMillis();
        int countInt = Integer.valueOf(count).intValue();
        parentFacade.createList(ParentFactory.createList(countInt));
        long end = System.currentTimeMillis();
        System.out.println("Time: " + (end - start) / 1000);
        System.out.println("-------Finish---------");
    }
 
}

@Stateless
public class ParentFacade extends AbstractFacade<Parent> {

    @PersistenceContext(unitName = "EclipceLinkWebPU")
    private EntityManager em;
    
    @Override
    protected EntityManager getEntityManager() {
        return em;
    }
    
    public ParentFacade() {
        super(Parent.class);
    }
    
    public void createList(List<Parent> list) {
        for (Parent p : list) {
            this.create(p);
        }
        this.getEntityManager().flush();
        this.getEntityManager().getEntityManagerFactory().getCache().evictAll();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="EclipceLinkWebPU" transaction-type="JTA">
    <jta-data-source>eclipcelink_web</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
     <!-- <property name="eclipselink.flush-clear.cache" value="Drop"/>
      <property name="eclipselink.cache.shared.default" value="false"/>-->
    </properties>
  </persistence-unit>
</persistence>

  public void createList(List<Parent> list) {
        for (Parent p : list) {
            this.create(p);
        }
    }