nhibernate says 'mapping exception was unhandled' no persister for: MyNH.Domain.User - nhibernate

Question

I am using nHibernate and fluent.
I created a User.cs:
public class User
{
public virtual int Id { get; set; }
public virtual string Username { get; set; }
public virtual string Password { get; set; }
public virtual string Email { get; set; }
public virtual DateTime DateCreated { get; set; }
public virtual DateTime DateModified { get; set; }
}
Then in my mappinds folder:
public class UserMapping : ClassMap<User>
{
public UserMapping()
{
WithTable("ay_users");
Not.LazyLoad();
Id(x => x.Id).GeneratedBy.Identity();
Map(x => x.Username).Not.Nullable().WithLengthOf(256);
Map(x => x.Password).Not.Nullable().WithLengthOf(256);
Map(x => x.Email).Not.Nullable().WithLengthOf(100);
Map(x => x.DateCreated).Not.Nullable();
Map(x => x.DateModified).Not.Nullable();
}
}
Using the repository pattern for the nhibernate blog:
public class UserRepository : Repository<User>
{
}
public class Repository<T> : IRepository<T>
{
public ISession Session
{
get
{
return SessionProvider.GetSession();
}
}
public T GetById(int id)
{
return Session.Get<T>(id);
}
public ICollection<T> FindAll()
{
return Session.CreateCriteria(typeof(T)).List<T>();
}
public void Add(T product)
{
Session.Save(product);
}
public void Remove(T product)
{
Session.Delete(product);
}
}
public interface IRepository<T>
{
T GetById(int id);
ICollection<T> FindAll();
void Add(T entity);
void Remove(T entity);
}
public class SessionProvider
{
private static Configuration configuration;
private static ISessionFactory sessionFactory;
public static Configuration Configuration
{
get
{
if (configuration == null)
{
configuration = new Configuration();
configuration.Configure();
configuration.AddAssembly(typeof(User).Assembly);
}
return configuration;
}
}
public static ISessionFactory SessionFactory
{
get
{
if (sessionFactory == null)
sessionFactory = Configuration.BuildSessionFactory();
return sessionFactory;
}
}
private SessionProvider()
{ }
public static ISession GetSession()
{
return SessionFactory.OpenSession();
}
}
My config:
<?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.MsSql2005Dialect</property>
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="connection.connection_string">Server=.\SqlExpress;Initial Catalog=TestNH;User Id=dev;Password=123</property>
<property name="show_sql">true</property>
</session-factory>
</hibernate-configuration>
I created a console application to test the output:
static void Main(string[] args)
{
Console.WriteLine("starting...");
UserRepository users = new UserRepository();
User user = users.GetById(1);
Console.WriteLine("user is null: " + (null == user));
if(null != user)
Console.WriteLine("User: " + user.Username);
Console.WriteLine("ending...");
Console.ReadLine();
}
Error:
nhibernate says 'mapping exception was unhandled' no persister for: MyNH.Domain.User
What could be the issue, I did do the mapping?

Answer 1

NH says that you don't have the mapping for the User class.
You probably forgot to include that. Try to call this from your SessionProvider configurator:
Fluently.Configure()
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<UserMapping>())
.BuildSessionFactory();