MappingException: duplicate import

roniburd · **Posted:** Mon Oct 17, 2005 5:16 pm

Hi, I have the following HBM files. When I build NHibernate I get duplicate import whiche should not happen since they belong to diffrent namespaces

first hbm

Code:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping 
   xmlns="urn:nhibernate-mapping-2.0"  
   namespace="SAFJP.SICI.Model.Carteras.IntegracionRentabilidad.Estados"
   assembly="SAFJP.SICI.Model.Carteras"
   default-access="field">

   <class 
      name="EstadoNecesidadIntegracion" 
        table="E_Estado_Necesidad_Integracion" 
        mutable="false">
        
        <jcs-cache usage="read-only" />
        
        <id 
         name="mId" 
         column="estadoNecesidadIntegracion_ID" 
         type="Int32">
         <generator class="assigned" />
      </id>
      
      <discriminator 
         column="tipoEstadoNecesidadIntegracion_Class" 
         type="string" 
         length="5" />
      
      <property 
         name="mDescripcion"
         column="X_estadoControl"
      />

      <!-- ================================  -->
      <!-- Subclass Pendiente               -->
      <!-- ================================  -->
      <subclass 
         name="Pendiente"
         discriminator-value="PEN" >
      </subclass>
      
      <!-- ================================  -->
      <!-- Subclass Incial               -->
      <!-- ================================  -->
      <subclass 
         name="Inicial"
         discriminator-value="INI" >
      </subclass>
      
      
      <!-- ================================  -->
      <!-- Subclass Incompleto            -->
      <!-- ================================  -->
      <subclass 
         name="Incompleto"
         discriminator-value="INC">
      </subclass>
      
      <!-- ================================  -->
      <!-- Subclass Integrado               -->
      <!-- ================================  -->
      <subclass 
         name="Integrado"
         discriminator-value="INT">
      </subclass>
      
   </class>
</hibernate-mapping>

second hbm

Code:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping 
   xmlns="urn:nhibernate-mapping-2.0"  
   namespace="SAFJP.SICI.Model.Carteras.EstadosControles"
   assembly="SAFJP.SICI.Model.Carteras"
   default-access="field">

   <class 
      name="EstadoControl" 
        table="E_Estado_Control" 
        mutable="false">
        
        <cache usage="read-only" />
        
        <id 
         name="mId" 
         column="estadoControl_ID" 
         type="Int32" 
         access="field">
         <generator class="assigned" />
      </id>
      
      <discriminator 
         column="tipoEstadoControl_Class" 
         type="string" 
         length="5" />
      
      <property 
         name="mDescripcion"
         column="X_estadoControl"
      />
      
      <!-- ================================  -->
      <!-- Subclass Inicial               -->
      <!-- ================================  -->
      <subclass 
         name="Inicial"
         discriminator-value="INI">
      </subclass>
      <!-- ================================  -->
      <!-- Subclass Ejecutando            -->
      <!-- ================================  -->
      <subclass 
         name="Ejecutando"
         discriminator-value="EJE">
      </subclass>
      <!-- ================================  -->
      <!-- Subclass ConErrores            -->
      <!-- ================================  -->
      <subclass 
         name="ConErrores"
         discriminator-value="CERR">
      </subclass>
      <!-- ================================  -->
      <!-- Subclass Finalizado            -->
      <!-- ================================  -->
      <subclass 
         name="Finalizado"
         discriminator-value="FIN">
      </subclass>
      <!-- ================================  -->
      <!-- Subclass PendienteJustificacion   -->
      <!-- ================================  -->
      <subclass 
         name="PendienteJustificacion"
         discriminator-value="PJUS">
      </subclass>
      <!-- ================================  -->
      <!-- Subclass Inconsistente            -->
      <!-- ================================  -->
      <subclass 
         name="Inconsistente"
         discriminator-value="INC">
      </subclass>
   </class>
</hibernate-mapping>

Thanks!

roniburd · **Posted:** Fri Oct 21, 2005 10:28 am

No news on this bug?? I'm starting to have to get really inventive with class names if this bug is not solved.

Thanks!

sergey · **Posted:** Sun Oct 23, 2005 9:58 am

Please enter a bug report in JIRA

jemiller · **Posted:** Thu Mar 30, 2006 7:53 pm

I think I may be running into the same problem. I'm trying to subclass a class in another namespace that has the same name.

I want to subclass a class named "AT.Persistence.Entity.User" with the name "Reservations.Persistence.Entity.User."

I'm using the following mapping file. I also tried making the name in the subclass element fully qualified, but, it didn't seem to help.

Code:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" 
  assembly="ReservationsLibrary"
  namespace="Reservations.Persistence.Entity">
  <subclass name="User" extends="AT.Persistence.Entity.User, ATLibrary">
  </subclass>
</hibernate-mapping>

And I'm getting the following exception when I attempt to create the database using SchemaExport.

Code:

Unhandled Exception: NHibernate.MappingException: duplicate import: User
   at NHibernate.Cfg.Mappings.AddImport(String className, String rename)
   at NHibernate.Cfg.Binder.BindClass(XmlNode node, PersistentClass model, Mappings mapping)
   at NHibernate.Cfg.Binder.BindSubclass(XmlNode node, Subclass model, Mappings mappings)
   at NHibernate.Cfg.Binder.BindRoot(XmlDocument doc, Mappings model)
   at NHibernate.Cfg.Configuration.AddValidatedDocument(XmlDocument doc)
   at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream)
   at NHibernate.Cfg.Configuration.AddAssembly(Assembly assembly, Boolean skipOrdering)
   at NHibernate.Cfg.Configuration.AddAssembly(String assemblyName)
   at Reservations.Program.Main(String[] args) in C:\Documents and Settings\jemiller\My Documents\Visual Studio 2005\Projects\Reservations\CreateDatabase\Program.cs:line 20

Does anyone know if it's possible to do this? Or, is it a known limitation? Was it ever fixed previously?

jemiller · **Posted:** Mon Apr 03, 2006 5:18 pm

Has anyone else got this to work? Am I doing something wrong?

gert · **Joined:** Thu Jan 19, 2006 4:29 pm **Posts:** 348

jemiller wrote:

Code:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" 
  assembly="ReservationsLibrary"
  namespace="Reservations.Persistence.Entity">
  <subclass name="User" extends="AT.Persistence.Entity.User, ATLibrary">
  </subclass>
</hibernate-mapping>

Given that auto-import defaults to true, maybe one (or both) of the mapping files should specify

Code:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" 
  auto-import="false" [cut]>

Gert

jemiller · **Posted:** Tue Apr 04, 2006 1:03 pm

It worked!!! You rule Gert. Thanks! :-) I've been wanting to get this to work for probably years now and it's finally working (I've been trying to get this to work in the Java version of Hibernate too).

This is a big help because this way I can have a common library that has base classes that implement most of what I need and then have subclasses in a different package that have extended functionality that is specific to a particular application and still have reasonable names. For example, I can have a User class in my common library and then have one in my application that has to do with reservations and add a Reservations property to that class to get a list of reservations for a user.

Thanks, much appreciated.

jemiller · **Posted:** Tue Apr 04, 2006 1:06 pm

I'd give you a credit, but, I don't think it will let me since I didn't start the thread. At any rate, thanks.

jafin · **Joined:** Mon Aug 15, 2005 11:50 pm **Posts:** 22

After making this change, in your HQL do you now need to specify the fully qualified name when referencing these objects?

jemiller · **Posted:** Thu Apr 06, 2006 12:55 pm

I set auto-import to false on the subclass and I left it set to true on the super class. I found that if I do a query with the unqualified name, it will return objects of the superclass and the subclass. If I want just the objects of the subclass, then, I have to specify that fully qualified name. I don't remember what happens if I specify the fully qualified name of the superclass (whether it returns specifically just the superclass types, or, if that includes the child classes, I'm guessing it's probably the later).

David Dilworth · **Posted:** Tue May 16, 2006 6:45 am

Just wanted to add a recommendation for Gert's solution to this post.

I've just encountered the duplicate import problem and setting the auto-import attribute to false in the hibernate-mapping element in the .hbm.xml file solves the problem nicely.

Many thanks.

gert · **Joined:** Thu Jan 19, 2006 4:29 pm **Posts:** 348

David Dilworth wrote:

I've just encountered the duplicate import problem and setting the auto-import attribute to false in the hibernate-mapping element in the .hbm.xml file solves the problem nicely.

You didn't specify if You use fully qualified names in HQL queries? Or if You have many mapping files and You set this attribute for only one of them? Or if You import needed classes manually?

Gert

David Dilworth · **Posted:** Tue May 16, 2006 8:56 am

Actually I ran into the problem when I was using the HbmSerializer, which is part of the NHibernate.Mapping.Attributes (NHMA) namespace.

I had marked-up two classes which had the same name with the relevant NHMA attributes. My two classes were in different namespaces.

Trying to create an NHibernate configuration using my serialized assembly gave me the error.

As I said, setting the auto-import attribute to false solved the problem.

gert · **Joined:** Thu Jan 19, 2006 4:29 pm **Posts:** 348

David Dilworth wrote:

Actually I ran into the problem when I was using the HbmSerializer, which is part of the NHibernate.Mapping.Attributes (NHMA) namespace.

I had marked-up two classes which had the same name with the relevant NHMA attributes. My two classes were in different namespaces.

Trying to create an NHibernate configuration using my serialized assembly gave me the error.

As I said, setting the auto-import attribute to false solved the problem.

I did totally misread Your post. Please diregard my previous answer ;) My only defence is that I'm not native english speaker :-P

Gert

shoorik · **Posted:** Thu Jul 05, 2007 5:25 pm

David Dilworth wrote:

Actually I ran into the problem when I was using the HbmSerializer, which is part of the NHibernate.Mapping.Attributes (NHMA) namespace.

How would one specify the <import class="..."> setting using the Mapping.Attributes contrib (v.1.0.3)?

I tried sticking the ImportAttribute onto the class: it didn't work because ImportAttribute is restricted to fields and properties. So I tried attaching it to one of my properties in the class: then it just gets dropped and no <import> is output into the configuration.

Ideas?

Thanks,
Alex