Mapping errors

grupobgm · **Joined:** Mon May 29, 2006 6:07 am **Posts:** 12

Hello everybody:

I´ve start working with hibernate only for one month and i have a problem.

I´ve got a mapping file:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping.dtd">
<hibernate-mapping>
   <class name="model.ListaUsuarios" table="usuarios">
       <id name="id" type="long" column="id">
         <generator class="assigned"/>
      </id>
     
     
<set role="lusuarios" table="usuario" >
    <key column="id"/>
    
    <element type="string" column="nombre"/>
</set>

       
</class>
</hibernate-mapping>

for this class:

Code:

package model;

import java.util.Set;

public class ListaUsuarios {

   private Set lusuarios;
   private int id;

   public int getId() {
      return id;
   }

   public void setId(int id) {
      this.id = id;
   }

   public Set getLusuarios() {
      return lusuarios;
   }

   public void setLusuarios(Set lusuarios) {
      this.lusuarios = lusuarios;
   }



}

i think that it´s ok, but the tomcat show the next error:

Code:

Initial SessionFactory creation failed.java.lang.NullPointerException

and i don´t know why. Can anybody help me?

Thanks a lot[/code]

jbosseur · **Posted:** Mon May 29, 2006 7:15 am

Can you please post a bigger part of teh stack trace....

grupobgm · **Joined:** Mon May 29, 2006 6:07 am **Posts:** 12

Thanks a lot, but now we know the problem, it was the DTD version, we need the 3.0 version.