I want to make a simple example-application in which I have nine classes (Adresse, Person, Student, Anmeldung ... ). I wrote all mapping-files and I can create database (SchemaExport). Now, I want to save my objects ant it doesn't work. If I create Adresse- and Person-Object, it works. But with Student-Object I have the
java.lang.ClassCastException. And the problem ist with the follwong part of the mapping-file for
Student:
Code:
<!-- Liste der Anmeldungen -->
<set name="anmeldungListe" cascade="none" lazy="true">
<key column="ANMELDUNG_ID" />
<one-to-many class="ch.fhz.hsw.hibernate.model.Anmeldung"/>
</set>
Here is my mapping file
Person.hbm.xml:
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="ch.fhz.hsw.hibernate.model.Person" table="t_personen">
<id name="personId" type="long" unsaved-value="null" >
<column name="ID" sql-type="integer" not-null="true"/>
<generator class="hilo"/>
</id>
<!-- Nachname -->
<property name="nachname">
<column not-null="true" sql-type="varchar(32)" name="NACHNAME"
/>
</property>
<!-- Vorname -->
<property name="vorname">
<column not-null="true" sql-type="varchar(32)" name="VORNAME" />
</property>
<one-to-one name="adresse"
class="ch.fhz.hsw.hibernate.model.Adresse" cascade="all" />
<!-- Unterklasse Dozent -->
<joined-subclass name="ch.fhz.hsw.hibernate.model.Dozent"
table="t_dozierende">
<key column="ID" />
<!-- Bidirektionale Associationen many-to-many -->
<!-- Faecher -->
<set name="faecherListe" table="t_dozierende_faecher"
cascade="none" lazy="true">
<key column="DOZENT_ID" />
<many-to-many class="ch.fhz.hsw.hibernate.model.Fach"
column="FACH_ID" />
</set>
<!-- Aufsichten -->
<set name="aufsichtenListe" table="t_dozierende_aufsichten"
cascade="none" lazy="true">
<key column="DOZIERENDE_ID" />
<many-to-many class="ch.fhz.hsw.hibernate.model.Aufsicht"
column="AUFSICHT_ID" />
</set>
</joined-subclass>
<!-- Unterklasse Student -->
<joined-subclass name="ch.fhz.hsw.hibernate.model.Student"
table="t_studierende">
<key column="ID" />
<!-- Liste der Anmeldungen -->
<set name="anmeldungListe" cascade="none" lazy="true">
<key column="ANMELDUNG_ID" />
<one-to-many class="ch.fhz.hsw.hibernate.model.Anmeldung"/>
</set>
</joined-subclass>
</class>
</hibernate-mapping>
Here is the mapping file Anmeldung.hbm.xml
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="ch.fhz.hsw.hibernate.model.Anmeldung" table="t_anmeldungen">
<id name="anmeldungId" type="long" unsaved-value="null" >
<column name="ID" sql-type="integer" not-null="true"/>
<generator class="hilo"/>
</id>
<!-- Anmeldungsdatum -->
<property name="anmeldungDatum">
<column name="ANMELDUNG_DATUM" sql-type="TIMESTAMP" />
</property>
<!-- Bidirektionale Assoziation 'Student' -->
<many-to-one name="student" class="ch.fhz.hsw.hibernate.model.Student" cascade="none" />
</class>
</hibernate-mapping>
Here are the java-files Student.java and Anmeldung.java:
Code:
package ch.fhz.hsw.hibernate.model;
import java.util.ArrayList;
import java.util.Collection;
public class Student extends Person
{
private long matrikelNummer;
private String studiengang;
private int semester;
private Collection anmeldungListe;
public Student()
{
anmeldungListe = new ArrayList();
}
/**
* @param adresse Adresse
* @param nachname String
* @param vorname String
* @param matrikelNummer long
* @param studiengang String
* @param semester int
*/
public Student(Adresse adresse, String nachname, String vorname,
long matrikelNummer, String studiengang, int semester)
{
super(adresse, nachname, vorname);
this.matrikelNummer = matrikelNummer;
this.studiengang = studiengang;
this.semester = semester;
anmeldungListe = new ArrayList();
}
/**
* @return matrikelNummer long
*/
public long getMatrikelNummer()
{
return matrikelNummer;
}
/**
* @param matrikelNummer long
*/
public void setMatrikelNummer(long matrikelNummer)
{
this.matrikelNummer = matrikelNummer;
}
/**
* @return semester int
*/
public int getSemester()
{
return semester;
}
/**
* @param semester int
*/
public void setSemester(int semester)
{
this.semester = semester;
}
/**
* @return studiengang String
*/
public String getStudiengang()
{
return studiengang;
}
/**
* @param studiengang String
*/
public void setStudiengang(String studiengang)
{
this.studiengang = studiengang;
}
/**
* @return anmeldungListe Collection
*/
public Collection getAnmeldungListe()
{
return anmeldungListe;
}
/**
* @param anmeldungListe Collection
*/
public void setAnmeldungListe(Collection anmeldungListe)
{
this.anmeldungListe = anmeldungListe;
}
/**
* @param anmeldung Anmeldung
*/
public void addAnmeldung(Anmeldung anmeldung)
{
anmeldungListe.add(anmeldung);
}
/**
* @param anmeldung Anmeldung
* @return boolean
*/
public boolean removeAnmeldung(Anmeldung anmeldung)
{
return ((ArrayList) anmeldungListe).remove(anmeldung);
}
}
Code:
package ch.fhz.hsw.hibernate.model;
import java.util.GregorianCalendar;
import ch.fhz.hsw.hibernate.util.Util;
public class Anmeldung
{
private Long anmeldungId;
private GregorianCalendar anmeldungDatum;
private Student student;
public Anmeldung()
{
}
/**
* @param anmeldungDatum
* @param student
*/
public Anmeldung(GregorianCalendar anmeldungDatum, Student student)
{
this.anmeldungDatum = anmeldungDatum;
this.student = student;
}
/**
* @return anmeldungDatum GregorianCalendar
*/
public GregorianCalendar getAnmeldungDatum()
{
return anmeldungDatum;
}
/**
* @param anmeldungDatum GregorianCalendar
*/
public void setAnmeldungDatum(GregorianCalendar anmeldungDatum)
{
this.anmeldungDatum = anmeldungDatum;
}
/**
* @return anmeldungId Long
*/
public Long getAnmeldungId()
{
return anmeldungId;
}
/**
* @param anmeldungId Long
*/
private void setAnmeldungId(Long anmeldungId)
{
this.anmeldungId = anmeldungId;
}
/**
* @return student Student
*/
public Student getStudent()
{
return student;
}
/**
* @param student Student
*/
public void setStudent(Student student)
{
this.student = student;
}
}
And here is the method
main:
Code:
public static void main(String[] args)
{
Session session = null;
Transaction tx = null;
PrintStream out = System.out;
try
{
session = HibernateUtil.currentSession();
tx = session.beginTransaction();
Adresse a1 = new Adresse("Pilatusstrasse", 12, 6002, "Luzern",
"041 320 00 44", "rolf@tic.ch");
session.save(a1);
Student s1 = new Student(a1, "Pfister", "Markus", 668, "Betriebswirtschaft", 2);
session.save(s1);
tx.commit();
}
catch (HibernateException e)
{
System.err.println(e.toString());
}
}
Ther stack trace is as follow:
Code:
7.07.2004 11:39:18 net.sf.hibernate.cfg.Environment <clinit>
INFO: Hibernate 2.1.4
27.07.2004 11:39:18 net.sf.hibernate.cfg.Environment <clinit>
INFO: loaded properties from resource hibernate.properties: {hibernate.connection.username=student, hibernate.connection.password=, hibernate.cglib.use_reflection_optimizer=true, hibernate.connection.pool_size=10, hibernate.dialect=net.sf.hibernate.dialect.PostgreSQLDialect, hibernate.connection.url=jdbc:postgresql://127.0.0.1:5432/adressen_db, hibernate.connection.driver_class=org.postgresql.Driver}
27.07.2004 11:39:18 net.sf.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Adresse.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Adresse -> t_adressen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Person.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Person -> t_personen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindJoinedSubclass
INFO: Mapping joined-subclass: ch.fhz.hsw.hibernate.model.Dozent -> t_dozierende
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollection
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Dozent.faecherListe -> t_dozierende_faecher
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollection
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Dozent.aufsichtenListe -> t_dozierende_aufsichten
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindJoinedSubclass
INFO: Mapping joined-subclass: ch.fhz.hsw.hibernate.model.Student -> t_studierende
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Fach.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Fach -> t_faecher
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollection
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Fach.dozierendeListe -> t_dozierende_faecher
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Aufsicht.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Aufsicht -> t_aufsichten
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollection
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Aufsicht.aufsichtPersonenListe -> t_dozierende_aufsichten
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Klassenraum.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Klassenraum -> t_klassenraeume
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Anmeldung.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Anmeldung -> t_anmeldungen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Pruefung.hbm.xml
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: ch.fhz.hsw.hibernate.model.Pruefung -> t_pruefungen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration doConfigure
INFO: Configured SessionFactory: null
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration secondPassCompile
INFO: processing one-to-many association mappings
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Student.anmeldungListe -> t_anmeldungen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Pruefung.klassenraumListe -> t_klassenraeume
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Pruefung.aufsichtPersonen -> t_aufsichten
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Pruefung.anmeldungListe -> t_anmeldungen
27.07.2004 11:39:18 net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: ch.fhz.hsw.hibernate.model.Pruefung.faecherListe -> t_faecher
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration secondPassCompile
INFO: processing one-to-one association property references
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration secondPassCompile
INFO: processing foreign key constraints
27.07.2004 11:39:18 net.sf.hibernate.dialect.Dialect <init>
INFO: Using dialect: net.sf.hibernate.dialect.PostgreSQLDialect
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: Use outer join fetching: true
27.07.2004 11:39:18 net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Using Hibernate built-in connection pool (not for production use!)
27.07.2004 11:39:18 net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Hibernate connection pool size: 10
27.07.2004 11:39:18 net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: using driver: org.postgresql.Driver at URL: jdbc:postgresql://localhost:5432/adressen_db
27.07.2004 11:39:18 net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: connection properties: {user=student, password=, driver-class=org.postgresql.Driver}
27.07.2004 11:39:18 net.sf.hibernate.transaction.TransactionManagerLookupFactory getTransactionManagerLookup
INFO: No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommended)
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: Use scrollable result sets: true
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: Use JDBC3 getGeneratedKeys(): false
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: Optimize cache for minimal puts: false
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: Query language substitutions: {}
27.07.2004 11:39:18 net.sf.hibernate.cfg.SettingsFactory buildSettings
INFO: cache provider: net.sf.ehcache.hibernate.Provider
27.07.2004 11:39:18 net.sf.hibernate.cfg.Configuration configureCaches
INFO: instantiating and configuring caches
27.07.2004 11:39:18 net.sf.hibernate.impl.SessionFactoryImpl <init>
INFO: building session factory
27.07.2004 11:39:19 net.sf.hibernate.impl.SessionFactoryObjectFactory addInstance
INFO: no JNDI name configured
java.lang.ClassCastException
at net.sf.hibernate.type.SetType.wrap(SetType.java:24)
at net.sf.hibernate.impl.WrapVisitor.processArrayOrNewCollection(WrapVisitor.java:78)
at net.sf.hibernate.impl.WrapVisitor.processCollection(WrapVisitor.java:49)
at net.sf.hibernate.impl.AbstractVisitor.processValue(AbstractVisitor.java:69)
at net.sf.hibernate.impl.WrapVisitor.processValues(WrapVisitor.java:93)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:920)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:857)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:779)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)
at ch.fhz.hsw.hibernate.test.TestClass.main(TestClass.java:46)
Exception in thread "main"
Thanks for any help.
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