My hbm xml files are in the project librarie called Domain. In the hibernate.cfg.xml file I specify <mapping assembly="Domain" />

when I do a EmployeeDAO.get(typeof(Employee), 7)

I get Unknown Enityt class Domain.Employee

here is the debug output of Hibernate

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2005-11-17 15:02:36,927 [1980] DEBUG NHibernate.Cfg.Environment - no hibernate settings in app.config/web.config were found
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - connection.provider=NHibernate.Connection.DriverConnectionProvider
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - connection.driver_class=NHibernate.Driver.SqlClientDriver
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - connection.connection_string=Server=Northwind;initial catalog=Northwind;User ID=superuser;Password=qweqwe;
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - show_sql=true
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - dialect=NHibernate.Dialect.MsSql2000Dialect
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - use_outer_join=true
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - query.substitutions=true 1, false 0, yes 'Y', no 'N'
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - HBSpringSessionFactory<-Domain
2005-11-17 15:02:38,099 [1980] INFO NHibernate.Cfg.Configuration - searching for mapped documents in assembly: Domain
2005-11-17 15:02:38,099 [1980] INFO NHibernate.Cfg.Configuration - Configured SessionFactory: HBSpringSessionFactory
2005-11-17 15:02:38,099 [1980] DEBUG NHibernate.Cfg.Configuration - properties: System.Collections.Hashtable
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.Configuration - processing one-to-many association mappings
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.Configuration - processing one-to-one association property references
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.Configuration - processing foreign key constraints
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Dialect.Dialect - Using dialect: NHibernate.Dialect.MsSql2000Dialect
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.SettingsFactory - use outer join fetching: True
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Connection.ConnectionProviderFactory - Intitializing connection provider: NHibernate.Connection.DriverConnectionProvider
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Connection.ConnectionProvider - Configuring ConnectionProvider
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.SettingsFactory - Optimize cache for minimal puts: False
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.SettingsFactory - echoing all SQL to stdout
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.SettingsFactory - Query language substitutions: {yes='Y', true=1, no='N', false=0}
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.SettingsFactory - cache provider: NHibernate.Cache.HashtableCacheProvider
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Cfg.Configuration - instantiating and configuring caches
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Impl.SessionFactoryImpl - building session factory
2005-11-17 15:02:39,068 [1980] DEBUG NHibernate.Impl.SessionFactoryImpl - instantiating session factory with properties: {show_sql=true, connection.provider=NHibernate.Connection.DriverConnectionProvider, dialect=NHibernate.Dialect.MsSql2000Dialect, connection.driver_class=NHibernate.Driver.SqlClientDriver, hibernate.session_factory_name=HBSpringSessionFactory, hibernate.use_outer_join=true, hibernate.connection.connection_string=Server=Northwind;initial catalog=Northwind;User ID=superuser;Password=qweqwe;, hibernate.connection.driver_class=NHibernate.Driver.SqlClientDriver, query.substitutions=true 1, false 0, yes 'Y', no 'N', connection.connection_string=Server=Northwind;initial catalog=Northwind;User ID=superuser;Password=qweqwe;, hibernate.connection.provider=NHibernate.Connection.DriverConnectionProvider, hibernate.dialect=NHibernate.Dialect.MsSql2000Dialect, use_outer_join=true, hibernate.show_sql=true, hibernate.query.substitutions=true 1, false 0, yes 'Y', no 'N'}
2005-11-17 15:02:39,068 [1980] DEBUG NHibernate.Impl.SessionFactoryObjectFactory - initializing class SessionFactoryObjectFactory
2005-11-17 15:02:39,068 [1980] DEBUG NHibernate.Impl.SessionFactoryObjectFactory - registered: f9fed28cfab64567ae5a28dacd4cb361(HBSpringSessionFactory)
2005-11-17 15:02:39,068 [1980] INFO NHibernate.Impl.SessionFactoryObjectFactory - Factory name:HBSpringSessionFactory
2005-11-17 15:02:39,068 [1980] DEBUG NHibernate.Impl.SessionFactoryImpl - Instantiated session factory

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Anyone knows if my Nhibernate has actually read my mapping files. :?: :(

You should read the mapping found after:
INFO NHibernate.Cfg.Configuration - searching for mapped documents in assembly: Domain

So it looks like your assembly doesn't contain any hbm.xml files.
Make sure that you set "Embedded Resource" on them in the Visual Studio project...

Thanks Pixel thats waht it was.