Can't make an array array insert of javax.persistence.EntityManager

In general, ORM in the project and everything seems to be an insertion of select. But there is a problem. If I want to sink in an array of strings, an error flies.

public EntityManager em = Persistence.createEntityManagerFactory("COLIBRI").createEntityManager(); public void insertAVAYAcmCDRs(List<AvayaCmCdr> cdrList) { em.getTransaction().begin(); for (AvayaCmCdr aCdrList : cdrList) { em.persist(aCdrList); } em.getTransaction().commit(); } 

but if on one line all is normal

 public void insertAVAYAcmCDRs(List<AvayaCmCdr> cdrList) { for (AvayaCmCdr avayaCmCdr : cdrList) { em.getTransaction().begin(); em.persist(avayaCmCdr); em.getTransaction().commit(); } } 

I tried different examples of Tipo

 em.getTransaction().begin(); for (int i = 1; i <= 1000000; i++) { Point point = new Point(i, i); em.persist(point); if ((i % 10000) == 0) { em.flush(); em.clear(); } } em.getTransaction().commit(); 

and other options helps nothing. an error on the em.persist(aCdrList); line em.persist(aCdrList);

 org.hibernate.exception.SQLGrammarException: could not execute statement