java.lang.NullPointerException

[Anonymous]

Hi,
i've just installed Hibernator 0.9.6 (version with lib) and i encounter this error when i try to connect to my database.
I'm using Eclipse 2.1.
I've dont a little project with one class :
package xnet;
public class Box
{
    private String cd_box;
    private String txt_quotefield;
    private String cd_box_link;
   
    public Box()
    {
    }
   
    /**
     * @return
     */
    public String getCd_box()
    {
        return cd_box;
    }

    /**
     * @param string
     */
    public void setCd_box(String string)
    {
        cd_box = string;
    }
    /**
     * @return
     */
    public String getCd_box_link()
    {
        return cd_box_link;
    }

    /**
     * @return
     */
    public String getTxt_quotefield()
    {
        return txt_quotefield;
    }

    /**
     * @param string
     */
    public void setCd_box_link(String string)
    {
        cd_box_link = string;
    }

    /**
     * @param string
     */
    public void setTxt_quotefield(String string)
    {
        txt_quotefield = string;
    }

}

This is the Box.hbm.xml generated by Hibernator :
<?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="xnet.Box" table="box">
        <property name="cd_box"/>
        <property name="cd_box_link"/>
        <property name="txt_quotefield"/>
    </class>

</hibernate-mapping>

And this is the error while trying to map to my database (i'm usin Oracle 8i)

java.lang.NullPointerException
    at net.sf.hibernate.mapping.PersistentClass.createPrimaryKey(PersistentClass.java:176)
    at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:292)
    at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1095)
    at net.sf.hibernate.cfg.Configuration.add(Configuration.java:230)
    at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:155)
    at net.sf.hibernator.HibernateConnection.createConnection(HibernateConnection.java:168)
    at net.sf.hibernator.views.ConnectionView$8.run(ConnectionView.java:199)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
rethrown as net.sf.hibernate.MappingException
    at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:159)
    at net.sf.hibernator.HibernateConnection.createConnection(HibernateConnection.java:168)
    at net.sf.hibernator.views.ConnectionView$8.run(ConnectionView.java:199)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
Caused by: java.lang.NullPointerException
    at net.sf.hibernate.mapping.PersistentClass.createPrimaryKey(PersistentClass.java:176)
    at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:292)
    at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1095)
    at net.sf.hibernate.cfg.Configuration.add(Configuration.java:230)
    at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:155)
    ... 3 more

Is there something missing in my installation ?
Thank you for your help

Sincerely

[Anonymous]

same problem here :(

using oracle9i, eclipse 2.1.2

[Daniel Bradby]

I can see how the stack trace is coming out of Hibernate from a method called to do with primary key.

java.lang.NullPointerException
at net.sf.hibernate.mapping.PersistentClass.createPrimaryKey(PersistentClass.java:176)

I suspect you need to add an id mapping element underneath you class element.

Is this the same for you Christoph?