Hi everyone,
i have a client application (Batch) which accesses a self-written EJB Service
(running on jboss AS 4.2.3).
Through this EJB Service the client can retrieve Entities, and merge changes
back to the DB.
My Problem comes up when i try to use the EntityManager.merge() Method. Instead
of overwriting the existing entity in the DB, it creates a new entry. Further
iÃÂôve noticed that the old entry has Version-Column set to 1 and the new
one has Version-Column set to 0.
I also tried to upgrade to the newest hibernate version but without success.
Can anyone come up with a solution, how to use the merge method? I appreciate
any help!!!!
I've attached some of my sources:
merge-method call in EJB Service-Class
| @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
| public void updateDealer(Dealer dealer) {
| em.merge(dealer);
| em.flush();
| }
|
getEntity / getDealer Call in EJB Service Class
| public Dealer getDealer(int agDealerCode) {
| Dealer dealer = null;
|
| Query q = em.createQuery("From Dealer Where dealerNo = :dealerno");
|
| q.setParameter("dealerno", agDealerCode);
|
| try {
| dealer = (Dealer) q.getSingleResult();
| } catch (NoResultException nrEx) {
| // do nothing just return null value;
| }
| return dealer;
| }
|
Dealer Entity
| package ch.hstService.client.model;
|
| import java.io.Serializable;
| import java.util.ArrayList;
| import java.util.Collection;
| import java.util.HashSet;
| import java.util.Set;
|
| import javax.persistence.CascadeType;
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.FetchType;
| import javax.persistence.GeneratedValue;
| import javax.persistence.GenerationType;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.OneToMany;
| import javax.persistence.Table;
| import javax.persistence.Version;
|
| @Entity
| @Table(schema="HAENDLERSTAMM")
| public class Dealer implements Serializable {
|
| /******** Properties *******/
|
| @Id @GeneratedValue(strategy=GenerationType.SEQUENCE)
| @Column(name="id_dealer")
| private Long id = null;
|
| @Version
| private Long version;
|
|
| @Column(length=200)
| private String dpName;
|
| @Column(length=50)
| private String dealerType;
|
| @Column(name="market_name_official", length=200)
| private String marketNameOfficial;
|
| @Column(name="owner_dpname", length=200)
| private String ownerDpName;
|
| @Column(name="outlet_type_architectural", length=100)
| private String outletTypeArchitectural;
|
| @Column(length=200)
| private String name;
|
| @Column(name="additional_name", length=200)
| private String additionalName;
|
| @Column(name="vat_number", length=20)
| private String vatNumber;
|
| @Column(name="default_language", length=15)
| private String defaultLanguage;
|
| private int dealerNo;
|
| @Column(length=200)
| private String otherMakes;
|
| @OneToMany(cascade={CascadeType.ALL}, fetch=FetchType.EAGER )
| @JoinColumn(name="id_dealer",referencedColumnName = "id_dealer")
| private Set<Address> addresses = new HashSet<Address>();
|
| @OneToMany(cascade={CascadeType.MERGE, CascadeType.PERSIST,
CascadeType.REMOVE}, fetch=FetchType.EAGER)
| @JoinColumn(name="id_dealer",referencedColumnName = "id_dealer")
| private Set<Email> emails = new HashSet<Email>();
|
| @OneToMany(cascade={CascadeType.MERGE, CascadeType.PERSIST,
CascadeType.REMOVE }, fetch=FetchType.EAGER)
| @JoinColumn(name="id_dealer",referencedColumnName = "id_dealer")
| private Set<Phone> phones = new HashSet<Phone>();
|
| @OneToMany(mappedBy="dealer", cascade={CascadeType.MERGE,
CascadeType.PERSIST, CascadeType.REMOVE}, fetch=FetchType.EAGER)
| @JoinColumn(name="id_dealer")
| private Set<Contract> contracts = new HashSet<Contract>();
|
| @OneToMany(cascade={CascadeType.MERGE, CascadeType.PERSIST,
CascadeType.REMOVE }, fetch=FetchType.EAGER)
| @JoinColumn(name="id_dealer",referencedColumnName = "id_dealer")
| private Set<URL> urls = new HashSet<URL>();
|
| /******** Konstruktoren *******/
|
| public Dealer() { //Paket-weiter Konstruktor
| }
|
|
| /******** Getter / Setter *******/
| }
|
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