C:\Users\xxxxx\Documents\Visual Studio 2008\Projects\NHAttTest>tree /F
C:.
│   NHAttTest.sln
│
└───NHAttTest
    │   hibernate.cfg.xml
    │   NHAttTest.csproj
    │   Product.cs
    │   Program.cs
    │
    ├───bin
    │   └───Debug
    │           Antlr3.Runtime.dll
    │           Castle.Core.dll
    │           Castle.Core.xml
    │           Castle.DynamicProxy2.dll
    │           Castle.DynamicProxy2.xml
    │           hibernate.cfg.xml
    │           Iesi.Collections.dll
    │           Iesi.Collections.xml
    │           MySql.Data.dll
    │           NHAttTest.exe
    │           NHAttTest.pdb
    │           NHAttTest.vshost.exe
    │           NHAttTest.vshost.exe.manifest
    │           NHibernate.ByteCode.Castle.dll
    │           NHibernate.ByteCode.Castle.xml
    │           NHibernate.dll
    │           NHibernate.Mapping.Attributes.dll
    │           NHibernate.xml
    │           nunit.framework.dll
    │           nunit.framework.xml
    │
    ├───obj
    │   └───Debug
    │       │   NHAttTest.csproj.FileListAbsolute.txt
    │       │   NHAttTest.exe
    │       │   NHAttTest.pdb
    │       │
    │       └───TempPE
    └───Properties
            AssemblyInfo.cs

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
        <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>   
        <property name="dialect">NHibernate.Dialect.MySQLDialect</property>
        <property name="connection.driver_class">NHibernate.Driver.MySqlDataDriver</property>
        <property name="connection.connection_string">Database=test2;Data Source=localhost;User Id=xxxxx;Password=xxxxx</property>
        <property name="hbm2ddl.keywords">none</property>



        <property name="show_sql">true</property>
        <property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
    </session-factory>

</hibernate-configuration>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate.Mapping.Attributes;

namespace NHAttTest {
    [Class]
    public class Product {
        [Id]
        public virtual int Id { get; set; }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate;
using NHibernate.Cfg;
using NUnit.Framework;
using NHibernate.Mapping.Attributes;
using NHibernate.Tool.hbm2ddl;

namespace NHAttTest {
    [TestFixture]
    public class Program {
        public static void Main(String[] args) {
            Start();
        }

        [Test]
        public static void Start() {
            Configuration cfg = new Configuration();
            cfg
                .Configure()
                .AddInputStream(HbmSerializer.Default.Serialize(typeof(Product).Assembly));
        }
    }
}

------ Test started: Assembly: NHAttTest.exe ------

TestCase 'NHAttTest.Program.Start'
failed: NHibernate.MappingException : Could not compile the mapping document: (unknown)
  ----> System.NullReferenceException : Object reference not set to an instance of an object.
   at NHibernate.Cfg.Configuration.LogAndThrow(Exception exception)
   at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc)
   at NHibernate.Cfg.Configuration.ProcessMappingsQueue()
   at NHibernate.Cfg.Configuration.AddDocumentThroughQueue(NamedXmlDocument document)
   at NHibernate.Cfg.Configuration.AddXmlReader(XmlReader hbmReader, String name)
   at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream, String name)
   at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream)
   C:\Users\xxxxxx\Documents\Visual Studio 2008\Projects\NHAttTest\NHAttTest\Program.cs(21,0): at NHAttTest.Program.Start()
   --NullReferenceException
   at NHibernate.Cfg.XmlHbmBinding.ClassBinder.BindClass(XmlNode node, IDecoratable classMapping, PersistentClass model, IDictionary`2 inheritedMetas)
   at NHibernate.Cfg.XmlHbmBinding.RootClassBinder.Bind(XmlNode node, HbmClass classSchema, IDictionary`2 inheritedMetas)
   at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddRootClasses(XmlNode parentNode, IDictionary`2 inheritedMetas)
   at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.Bind(XmlNode node)
   at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc)


0 passed, 1 failed, 0 skipped, took 4,74 seconds (NUnit 2.5).

[Class]
public class Product {
....

[Class(Name="NHAttTest.Product")]
public class Product {
....

failed: NHibernate.MappingException : Could not compile the mapping document: (unknown)
  ----> NHibernate.MappingException : persistent class NHAttTest.Product not found
  ----> System.TypeLoadException : Could not load type NHAttTest.Product. Possible cause: no assembly name specified.

[Class(Name="Product")]
public class Product {
....

failed: NHibernate.MappingException : Could not compile the mapping document: (unknown)
  ----> NHibernate.MappingException : persistent class Product not found
  ----> System.TypeLoadException : Could not load type Product. Possible cause: no assembly name specified.

using System;
using NHibernate.Mapping.Attributes;

namespace FirstSolution.Domain
{
   [Class(Name="FirstSolution.Domain.Product, FirstSolution")]
   public class Product
   {
      [Id(Name="Id")]
      public virtual Guid Id { get; set; }
      [Property(Name="Name")]
      public virtual string Name { get; set; }
      [Property(Name="Category")]
      public virtual string Category { get; set; }
      [Property(Name="Discontinued")]
      public virtual bool Discontinued { get; set; }
   }
}

[TestFixtureSetUp]
      public void TestFixtureSetUp()
      {
         MemoryStream stream = new MemoryStream();
         HbmSerializer.Default.Validate = true;
         HbmSerializer.Default.Serialize(stream, typeof(Product).Assembly);
         stream.Position = 0;
         _configuration = new Configuration();
         _configuration.Configure();
         _configuration.AddInputStream(stream);
         _sessionFactory = _configuration.BuildSessionFactory();
      }