Mapping Problem using hibernate and annotations
Hi,
i am German student and new to hibernate. I established a mn conetction between to entities using hbm.xml mapping files. now I try to create the same connection applying annotations. unfortunately it does not work and I do not now why. First my error message followed by my classes and xml's:
Initial SessionFactory creation failed.org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: domain.Termin.person in domain.Person.termine
Exception in thread "main" java.lang.ExceptionInInitializerError
at services.HibernateUtil.sessionFactory(HibernateUtil.java:39)
at services.HibernateUtil.getSessionFactory(HibernateUtil.java:20)
at test.Test.main(Test.java:20)
Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: domain.Termin.person in domain.Person.termine
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:552)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:517)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:316)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1286)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
at services.HibernateUtil.sessionFactory(HibernateUtil.java:36)
... 2 more
package domain;
import java.util.LinkedList;
import java.util.List;
import domain.Termin;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
@Entity
@Table(name ="PERSON")
publicclass Person{
privatelong id;
private String vorname;
private String nachname;
private List<Termin> termine=new LinkedList<Termin>();
public Person(){
}
@Id @GeneratedValue(strategy=GenerationType.AUTO)
publiclong getId(){
return id;
}
publicvoid setId(long id){
this.id = id;
}
public String getNachname(){
return nachname;
}
publicvoid setNachname(String nachname){
this.nachname = nachname;
}
public String getVorname(){
return vorname;
}
publicvoid setVorname(String vorname){
this.vorname = vorname;
}
publicvoid addTermin(Termin termin){
termine.add(termin);
}
@ManyToMany(mappedBy="person")
public List<Termin> getTermine(){
return termine;
}
publicvoid setTermine(List<Termin> termine){
this.termine = termine;
}
}
package domain;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
@Entity
@Table(name ="TERMIN")
publicclass Termin{
privatelong id;
private String titel;
private Person eigentuemer;
private List<Person> teilnehmer=new ArrayList<Person>();
publicvoid addTeilnehmer(Person person){
teilnehmer.add(person);
}
@ManyToMany
public List<Person> getTeilnehmer(){
return teilnehmer;
}
publicvoid setTeilnehmer(List<Person> teilnehmer){
this.teilnehmer = teilnehmer;
}
public Termin(){
}
@Id @GeneratedValue(strategy=GenerationType.AUTO)
publiclong getId(){
return id;
}
publicvoid setId(long id){
this.id = id;
}
public String getTitel(){
return titel;
}
publicvoid setTitel(String titel){
this.titel = titel;
}
public Person getEigentuemer(){
return eigentuemer;
}
publicvoid setEigentuemer(Person eigentuemer){
this.eigentuemer = eigentuemer;
}
}
package test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import services.HibernateUtil;
import domain.Person;
import domain.Termin;
publicclass Test{
publicstaticvoid main(String[] args){
Session session =null;
HibernateUtil.setRecreateDB(true);
session = HibernateUtil.getSessionFactory().getCurrentSession();
/*Person person1 =new Person();
person1.setNachname("P1");
Transaction transaction = session.beginTransaction();
session.save(person1);
transaction.commit();
Person person2 =new Person();
person2.setNachname("P2");
session = HibernateUtil.getSessionFactory().getCurrentSession();
transaction = session.beginTransaction();
session.save(person2);
transaction.commit();
Termin termin1 =new Termin();
termin1.setTitel("T1");
termin1.setEigentuemer(person1);
termin1.addTeilnehmer(person1);
termin1.addTeilnehmer(person2);
session = HibernateUtil.getSessionFactory().getCurrentSession();
transaction = session.beginTransaction();
session.save(termin1);
transaction.commit();
Termin termin2 =new Termin();
termin2.setTitel("t2");
termin2.setEigentuemer(person1);
termin2.addTeilnehmer(person1);
termin2.addTeilnehmer(person2);
transaction = session.beginTransaction();
session.save(termin2);
transaction.commit();
session.close();
*/
}
}
package services;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import domain.Person;
import domain.Termin;
publicclass HibernateUtil{
privatestaticboolean recreateDB =false;
publicstaticvoid setRecreateDB(boolean recreateDB){
HibernateUtil.recreateDB = recreateDB;
}
publicstatic SessionFactory getSessionFactory(){
if (sessionFactory ==null){
sessionFactory = sessionFactory("hibernate.cfg.xml");
}
return sessionFactory;
}
privatestatic SessionFactory sessionFactory =null;
privatestatic SessionFactory sessionFactory(String configurationFileName){
try{
AnnotationConfiguration annotationConfiguration =
new AnnotationConfiguration()
.addAnnotatedClass(Person.class)
.addAnnotatedClass(Termin.class);
if (recreateDB) annotationConfiguration.setProperty("hibernate.hbm2ddl.auto","create");
annotationConfiguration.configure();
return annotationConfiguration.buildSessionFactory();
}catch (Throwable ex){
System.err.println("Initial SessionFactory creation failed." + ex);
thrownew ExceptionInInitializerError(ex);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration
PUBLIC"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="hibernate.connection.password">application</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
<property name="hibernate.connection.username">application</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.show_sql">true</property>
</session-factory>
</hibernate-configuration>
