NullReferenceException when initializing NServiceBus within web application Application_Start method
- by SteveBering
I am running the 2.0 RTM of NServiceBus and am getting a NullReferenceException when my MessageModule binds the CurrentSessionContext to my NHibernate sessionfactory.
From within my Application_Start, I call the following method:
public static void WithWeb(IUnityContainer container)
{
log4net.Config.XmlConfigurator.Configure();
var childContainer = container.CreateChildContainer();
childContainer.RegisterInstance<ISessionFactory>(NHibernateSession.SessionFactory);
var bus = NServiceBus.Configure.WithWeb()
.UnityBuilder(childContainer)
.Log4Net()
.XmlSerializer()
.MsmqTransport()
.IsTransactional(true)
.PurgeOnStartup(false)
.UnicastBus()
.ImpersonateSender(false)
.LoadMessageHandlers()
.CreateBus();
var activeBus = bus.Start();
container.RegisterInstance(typeof(IBus), activeBus);
}
When the bus is started, my message module starts with the following:
public void HandleBeginMessage()
{
try
{
CurrentSessionContext.Bind(_sessionFactory.OpenSession());
}
catch (Exception e)
{
_log.Error("Error occurred in HandleBeginMessage of NHibernateMessageModule", e);
throw;
}
}
In looking at my log, we are logging the following error when the bind method is called:
System.NullReferenceException: Object reference not set to an instance of an object.
at NHibernate.Context.WebSessionContext.GetMap()
at NHibernate.Context.MapBasedSessionContext.set_Session(ISession value)
at NHibernate.Context.CurrentSessionContext.Bind(ISession session)
Apparently, there is some issue in getting access to the HttpContext. Should this call to configure NServiceBus occur later in the lifecycle than Application_Start? Or is there another workaround that others have used to get handlers working within an Asp.NET Web application?
Thanks,
Steve
