I've been fighting with this problem for a couple of days now, but I can't find the solution:

I have a table containing info about citizens - name, address etc, but also the id of each of the parents - who them selves of course are citizens too, and thus are in the same table.

My DTO looks something like this:

public class CitizenDTO
{
private int id;
private string name;
private CitizenDTO mother;
...

public CitizenDTO()
{
}

...

public CitizenDTO Mother
{
get { return mother;}
set {mother = value;}
}
}


and the corresponding hbm.xml file:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="GDCS.CivilRegister.Test.CitizenDTO, GDCS.CivilRegister" table="Citizen"
dynamic-update="true" lazy="true">
<id name="Id" column="ID">
<generator class="assigned" />
</id>
<property name="Name" type="string" column="name" not-null="true" />

<many-to-one
name="mother"
class="GDCS.CivilRegister.Test.CitizenDTO"
cascade="none"
outer-join="auto"
update="true"
insert="true"
foreign-key="mother_fk"
column="mothersid"
/>

</class>
</hibernate-mapping>

The problem is when I test it, I get the error message:
NHibernate.MappingException: could not find class: GDCS.CivilRegister.Test.CitizenDTO ---> System.TypeLoadException: Could not load type 'GDCS.CivilRegister.Test.CitizenDTO, NHibernate, Version=1.0.2.0, Culture=neutral, PublicKeyToken=154fdcb44c4484fc', check that type and assembly names are correct
at NHibernate.Util.ReflectHelper.ClassForName(String name)

but the moment I remove the self referencing parts (mother), It works perfectly, so I have a feeling there's something missing in my xml file? Can anybody help me with this?

Thanks a lot!

Hi Cyanid,
Try appending the assemby name to the name of the many-to-one class. Just like the class name of your class itself.
So, instead of
[code]
<many-to-one
name="mother"
class="GDCS.CivilRegister.Test.CitizenDTO"
[/code]
use
[code]
<many-to-one
name="mother"
class="GDCS.CivilRegister.Test.CitizenDTO, GDCS.CivilRegister"
[/code]

Thanks a lot! This really helped!

Now an error occurs in the next line of code instead. And I think I've still got problems with my hbm.xml file. Here's the code:

Configuration cfg = new Configuration();
cfg.AddAssembly("GDCS.CivilRegister");
_sessions = cfg.BuildSessionFactory();

ISession session = _sessions.OpenSession();
ICriteria citizen = session.CreateCriteria(typeof(CitizenDTO));
citizen.Add(Expression.Eq("Name", name));
citizen.Add(Expression.Eq("Mother.Name",mothersName));

IList list = citizen.List();

The error occures in the last line. The xml file is like this:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="GDCS.CivilRegister.Test.CitizenDTO, GDCS.CivilRegister" table="TestCitizen"
dynamic-update="true" lazy="true">
<id name="Id" column="ID">
<generator class="assigned" />
</id>
<property name="Name" type="string" column="name" not-null="true" />
<!-- mulige parametre:
update="true" insert="true" not-null="true"-->

...

<many-to-one
name="Mother"
class="GDCS.CivilRegister.Test.CitizenDTO, GDCS.CivilRegister"
cascade="none"
outer-join="auto"
update="true"
insert="true"
foreign-key="mother_fk"
column="mothersid"
/>

</class>
</hibernate-mapping>

and the error message this:

NHibernate.QueryException: could not resolve property:Mother.Name of :GDCS.CivilRegister.Test.CitizenDTO

The moment I delete the line
citizen.Add(Expression.Eq("Mother.Name",mothersName));

the program works fine and returns exactly what i expect.

Thanks again!