How to Dependency Injection with NHibernate and Autofac in domain layer ?

There are two ways to DI with nhibernate and Autofac in domain layer (Entities) :
1. You can use directly autofacContainerProvider.Resolve().
Pros:
- simple and quickly
Cons :
- strong coupling between IoC and Entities
- cannot create unit tests for domain layer
- don't support with different UI (Wcf, Web, ..)
2. To resolve these cons, we have implemented this solution :
In Global.asax.cs, in Application_Start add this code after builder.Build() :

  var builder = new ContainerBuilder();
    builder.RegisterType<SomeDependency>();
    // ... continue registering dependencies...
    // Once you're done registering things, set the container
    // provider up with your registrations.
    builder.RegisterAssemblyTypes(typeof (ProductEntity).Assembly).InstancePerDependency();
    _containerProvider = new ContainerProvider(builder.Build());

Web Application :

Nhibernate.Cfg.Environment.BytecodeProvider 
= new AutofacBytecodeProvider
(new ContainerProviderContainer(AutofacContainerProvider)
, new ProxyFactoryFactory()
, new DefaultCollectionTypeFactory());

WCF Application :

Nhibernate.Cfg.Environment.BytecodeProvider
 = new AutofacBytecodeProvider(AutofacContainer
, new ProxyFactoryFactory()
, new DefaultCollectionTypeFactory());

In nhibernate.cfg.xml you should use this factory :

<property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory
, NHibernate.ByteCode.Castle</property>

and in Entities of domain layer, you should declare the repository interfaces in constructors.