Hi Group,

I have created business entity project with the project name as "HospitalMgmt" and inside it I have created folder "BusinessEntities" which contains classes for business entities and namespace used is "HospitalMgmt.BusinessEntities". Assembly name is "HospitalMgmt.dll".

Code snippet is as below:

Configuration config = new Configuration();
config.AddAssembly(System.Reflection.Assembly.LoadFrom(@"HospitalMgmt.dll"));

Error is :

expn.Message = "persistent class HospitalMgmt.BusinessEntities.PatientDoctor, HospitalMgmt.BusinessEntities not found"

I have gone through the source code of nHibernate 1.2.0 ALpha1 and i found the following mistake.
1. In NHibernate.Util.ReflectHelper Class, functoin public static System.Type TypeFromAssembly( AssemblyQualifiedTypeName name ) contains a call to method Assembly.Load(name.Assembly) method.
When I debug the application and go to the Assembly.Load call, name.Assembly contains "HospitalMgmt.BusinessEntities". I think it should contain "HospitalMgmt" assembly name so that application can add the assembly.

Possible Workaround: In my case, assembly name is HospitalMgmt.dll
and namespace for business entity is "HospitalMgmt.BusinessEntities".
Now nhibernate tool tries to load the assembly with the name "HospitalMgmt.BusinessEntities" but actual asssembly name is "HospitalMgmt". NHibernate team has to make changes into existing code implimentation so that whatever namespace we have defined for business entity, it should load the assembly with the assembly name.

Can we see your mapping? Are you sure you dont't enter HospitalMgmt.BusinessEntities as assembly name yourself?

Take a look into file name and let me know if u want any more details:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="HospitalMgmt.BusinessEntities.PatientDoctor,HospitalMgmt.BusinessEntities" table="Patient_Doctor" lazy="true">

<composite-id access="field">
<key-property name="PatientId" column="Patient_Id" type="Int32" />
<key-property name="DoctorId" column="Doctor_Id" type="Int32" />

</composite-id>
<!-- Composite primary key is experimental. View the documentation for syntax. --><!-- problems: gustavohe@gmail.com -->
<many-to-one name="DiseaseId" column="Disease_Id" class="HospitalMgmt.BusinessEntities.Disease,HospitalMgmt.BusinessEntities" />

</class>
</hibernate-mapping>

Should probably be be <class name="HospitalMgmt.BusinessEntities.PatientDoctor,HospitalMgmt"

I have already tried that option. It seems like a bug in NHibernate because when i gone thru the code, extraction of assembly name uses mapping file wherein they are using the namespace value. But in my case namespace value is "HospitalMgmt.BusinessEntities" while assembly is "HospitalMgmt.dll".

Aren't You mixing together assembly OS file name and assembly name? They are diffrent values....

Assembly name does not usually contain ".dll" suffix.

In type name, "Namespace.Name.PatientDoctor,Assembly.Name",

so, in case of "HospitalMgmt.BusinessEntities.PatientDoctor,HospitalMgmt.BusinessEntities", assembly name is "HospitalMgmt.BusinessEntities" (which is in this case same as namespace name)

Note that the assmbly OS file name is not part of the type name.

Gert

Hi Gert,

I dont think so because assembly is the collection of all the compiled classes + manifest. And here assembly name is "HospitalMgmt.dll" so i have to code it as

Assembly.LoadFrom("HospitalMgmt.dll");

But if we talked about naming conventions, i have used namespace as "HospitalMgmt.BusinessEntities.PatientDoctor". And wat I found is nHibernate tool tries to load the assembly which it gets by just deleting the classname from the namespace i.e. HospitalMgmt.BusinessEntities.

Correct me if I am wrong!

Thanks!

No, you found wrong. Also, try not to use LoadFrom as it loads assemblies into a different context and NHibernate will not be able to load types from them. Use Load.

Hi Surgey,

I have tried both the options i.e. load and loadform but still no luck :(
I have explained the problem in my previous mail. And I have already gone thru the source code. In brief, my assembly name is "HospitalMgmt" and namespace is "HospitalMgmt.BusinessEntities". To load the assebly, nhibernate retrieves the assembly string by deleting just business entity from the above string. Lets say, if we have HospitalMgmt.BusinessEntities.Doctor class, then nHibernate tries to retrieve the assembly by deleting class name( Doctor )and tries to load the assembly with name "HospitalMgmt.BusinessEntities". But in actual, assembly name is "HospitalMgmt" then it throws an exception.

Please reply me ASAP.

-Thanks
Deepak

Take a moment and read http://msdn2.microsoft.com/en-us/library/system.type.assemblyqualifiedname.aspx

So, ig Your assembly name is "HospitalMgmt", have class mapping like

<class name="HospitalMgmt.BusinessEntities.PatientDoctor, HospitalMgmt" table="Patient_Doctor" lazy="true">

not

<class name="HospitalMgmt.BusinessEntities.PatientDoctor,HospitalMgmt.BusinessEntities" table="Patient_Doctor" lazy="true">

Gert

Hi Gert,

I have changed the className to

<class name="HospitalMgmt.BusinessEntities.PatientDoctor, HospitalMgmt" table="Patient_Doctor" lazy="true">

but still its not working.

Hey I found out the problem(but no the solution for the same:)
Internally, tool calls

public static System.Type TypeFromAssembly( AssemblyQualifiedTypeName name )
method of the ReflectHelper class and inside this method , it contains a code called

"Assembly assembly = Assembly.Load( name.Assembly );"

it throws an exception because it it trying to load the assebly with the name "HospitalMgmt.BusinessEntities". but here it should be like "HospitalMgmt".

Gert, if you have time then try to execute the scenerio which I am takling about and plse plse let me know ASAP.

-Thanks
Deepak

I changed mu project to have this short form of assembly name - and it works.

Make sure that all mapping files do specify correct class names. And rebuild (not just "build") Your project after changing mapppings. And so on.

Or post compileable minimal test project which replicates the problems.

Gert

Last week, I was very busy so cudn't replied. Sorry for the same.

Finally pb solved :)
Problem was with mapping file. We are using Mygeneration Object Mapping 1.1 template to create business entities and it was creating wrong mapping files. While executing the template, it asks for the namespace and internally it adds the class entry in mapping file as "namespace.classname, classname". But in our case, assembly name is quit different.
Workaround: I have modified the template in order to solver our purpose.


-Thanks