Hello,

I am trying to a many-to-many list inside as joind-subclass.
If I remove the List from the mapping file. I do not get any errors.
I am already trying for day's so please HELP ME!

I use HBN2.1.8

This is the mapping file and the failure trace:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-1.1.dtd">

<hibernate-mapping
>
<class
name="eindwerk.stockbeheer.Artikel"
table="Artikel"
>

<id
name="artikelId"
column="artikelId"
type="java.lang.Integer"
unsaved-value="null"
>
<generator class="native">
<!--
To add non XDoclet generator parameters, create a file named
hibernate-generator-params-Artikel.xml
containing the additional parameters and place it in your merge dir.
-->
</generator>
</id>

<property
name="minimumStock"
type="java.lang.Float"
column="minimumStock"
/>

<property
name="omschrijving"
type="java.lang.String"
column="omschrijving"
/>

<property
name="stockageEenheid"
type="java.lang.String"
column="stockageEenheid"
/>

<property
name="transportKosten"
type="java.lang.Float"
column="transportKosten"
/>

<property
name="verpakking"
type="java.lang.String"
column="verpakking"
/>

<property
name="artikelNr"
type="java.lang.Integer"
column="artikelNr"
/>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Artikel.xml
containing the additional properties and place it in your merge dir.
-->

<joined-subclass
name="eindwerk.stockbeheer.StockArtikel"
table="stockArtikel"
>
<key
column="artikelId"
/>
<property
name="geleverd"
type="boolean"
column="geleverd"
/>

<property
name="prijs"
type="java.lang.Float"
column="prijs"
/>

</joined-subclass>
<joined-subclass
name="eindwerk.stockbeheer.StandaardArtikel"
table="standaardArtikel"
>
<key
column="artikelId"
/>

<list
role="leveranciers"
table="standaardArtikelLeverancier"
lazy="false"
cascade="none"
>

<key
column="artikelId"
>
</key>

<index
column="leveranciersIndex"
/>

<many-to-many
class="eindwerk.stockbeheer.Leverancier"
column="leveranciersId"
outer-join="auto"
/>

</list>

</joined-subclass>

</class>

</hibernate-mapping>

java.lang.RuntimeException: net.sf.hibernate.MappingException: Error reading resource: eindwerk/stockbeheer/Artikel.hbm.xml
at eindwerk.hibernate.HibernatePersistence.<init>(HibernatePersistence.java:35)
at eindwerk.hibernate.HibernatePersistence.getInstance(HibernatePersistence.java:41)
at eindwerk.hibernate.HibernateSession.currentSession(HibernateSession.java:39)
at eindwerk.stockbeheer.test.TestArtikel.testNieuwStockArtikelInDB(TestArtikel.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:421)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:305)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:186)
Caused by: net.sf.hibernate.MappingException: Error reading resource: eindwerk/stockbeheer/Artikel.hbm.xml
at net.sf.hibernate.cfg.Configuration.addClass(Configuration.java:358)
at eindwerk.hibernate.HibernatePersistence.<init>(HibernatePersistence.java:28)
... 18 more
Caused by: net.sf.hibernate.MappingException: java.lang.NullPointerException
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:297)
at net.sf.hibernate.cfg.Configuration.addClass(Configuration.java:355)
... 19 more
Caused by: java.lang.NullPointerException
at net.sf.hibernate.util.StringHelper.qualify(StringHelper.java:241)
at net.sf.hibernate.cfg.Binder.bindCollection(Binder.java:509)
at net.sf.hibernate.cfg.Binder$3.create(Binder.java:1441)
at net.sf.hibernate.cfg.Binder.propertiesFromXML(Binder.java:1028)
at net.sf.hibernate.cfg.Binder.bindJoinedSubclass(Binder.java:216)
at net.sf.hibernate.cfg.Binder.handleJoinedSubclass(Binder.java:1087)
at net.sf.hibernate.cfg.Binder.propertiesFromXML(Binder.java:1058)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:362)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1256)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:253)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:289)
... 20 more

This is the code:

/*
* Created on 12-mrt-2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package eindwerk.stockbeheer;

import java.util.Set;

/**
* @hibernate.class table="Artikel"
*
*/
public class Artikel {

protected Integer artikelId;
protected Integer artikelNr;
protected String omschrijving;
protected String stockageEenheid;
protected Float transportKosten;
protected String verpakking;
protected Float minimumStock;
//protected Munt prijseenheid;

/**
* @hibernate.property
* column="minimumStock"
*/
public Float getMinimumStock() {
return minimumStock;
}
/**
* @param minimumStock The minimumStock to set.
*/
public void setMinimumStock(Float minimumStock) {
this.minimumStock = minimumStock;
}
/**
* @hibernate.property
* column="omschrijving"
*/
public String getOmschrijving() {
return omschrijving;
}
/**
* @param omschrijving The omschrijving to set.
*/
public void setOmschrijving(String omschrijving) {
this.omschrijving = omschrijving;
}
/**
* @hibernate.property
* column="stockageEenheid"
*/
public String getStockageEenheid() {
return stockageEenheid;
}
/**
* @param stockageEenheid The stockageEenheid to set.
*/
public void setStockageEenheid(String stockageEenheid) {
this.stockageEenheid = stockageEenheid;
}
/**
* @hibernate.property
* column="transportKosten"
*/
public Float getTransportKosten() {
return transportKosten;
}
/**
* @param transportKosten The transportKosten to set.
*/
public void setTransportKosten(Float transportKosten) {
this.transportKosten = transportKosten;
}
/**
* @hibernate.property
* column="verpakking"
*/
public String getVerpakking() {
return verpakking;
}
/**
* @param verpakking The verpakking to set.
*/
public void setVerpakking(String verpakking) {
this.verpakking = verpakking;
}
/**
* @hibernate.property
* column="artikelNr"
*/
public Integer getArtikelNr() {
return artikelNr;
}
/**
* @param artikelNr The artikelNr to set.
*/
public void setArtikelNr(Integer artikelNr) {
this.artikelNr = artikelNr;
}
/**
* @hibernate.id
* generator-class="native"
* column="artikelId"
* unsaved-value="null"
*/
public Integer getArtikelId() {
return artikelId;
}
/**
* @param id The id to set.
*/
public void setArtikelId(Integer artikelId) {
this.artikelId = artikelId;
}
public boolean equals(Object other) {
if (this == other) return true;
//werkt instanceof ook met subKlassen?
if (!(other instanceof Artikel)) return false;

final Artikel art = (Artikel) other;

if (!getArtikelId().equals(art.getArtikelId())) return false;
return true;
}
public int hashCode() {
int result;
result = getArtikelId().hashCode();
return result;
}
}
-------------------------------------------------------

/*
* Created on 14-mrt-2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package eindwerk.stockbeheer;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
* @author Steven
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/


/**
* @hibernate.joined-subclass table="standaardArtikel"
* @hibernate.joined-subclass-key column="artikelId"
*/
public class StandaardArtikel extends Artikel{
protected List leveranciers = new ArrayList();

/**
* @hibernate.list table="standaardArtikelLeverancier"
* @hibernate.collection-many-to-many class="eindwerk.stockbeheer.Leverancier" column="leveranciersId"
* @hibernate.collection-key column="artikelId"
* @hibernate.collection-index column="leveranciersIndex"
*/
public List getLeveranciers() {
return leveranciers;
}
/**
* @param leveranciers The leveranciers to set.
*/
public void setLeveranciers(List leveranciers) {
this.leveranciers = leveranciers;
}
}
--------------------------------------------------------------

/*
* Created on 14-mrt-2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package eindwerk.stockbeheer;

import java.io.Serializable;

/**
* @author Steven
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @hibernate.joined-subclass table="stockArtikel"
* @hibernate.joined-subclass-key column="artikelId"
*/
public class StockArtikel extends Artikel implements Serializable{
//protected Leveranier leverancier;
protected Float prijs;
protected boolean geleverd;


/**
* @return Returns the geleverd.
*/
/**
* @hibernate.property
* column="geleverd"
*/
public boolean isGeleverd() {
return geleverd;
}
/**
* @param geleverd The geleverd to set.
*/
public void setGeleverd(boolean geleverd) {
this.geleverd = geleverd;
}
/**
* @return Returns the prijs.
* @hibernate.property
* column="prijs"
*/
public Float getPrijs() {
return prijs;
}
/**
* @param prijs The prijs to set.
*/
public void setPrijs(Float prijs) {
this.prijs = prijs;
}
}

I have found the fault.

I should use 2.0 instead of 1.1 in the mapping-file DOCTYPE settings