Fluent NHibernate - exception occurred during configuration of persistence layer

Question

I am using Fluent NHibernate with an external 'hibernate.cfg.xml' file.

Following is the configuration code where I am getting error:

       var configuration = new Configuration();
       configuration.Configure();

       _sessionFactory = Fluently.Configure(configuration)
                .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Template>())
                .BuildSessionFactory();

        return _sessionFactory;

But When NHibernate is trying to configure, I am getting floowing error:

An exception occurred during configuration of persistence layer.

The inner exception says:

The ProxyFactoryFactory was not configured. Initialize 'proxyfactory.factory_class' property of the session-factory configuration section with one of the available NHibernate.ByteCode providers.

I googled and according to some solutions I found, I have made following changes:

1. Add following dlls to my app bin:

   Castle.Core.dll, Castle.DynamicProxy2.dll, NHibernate.ByteCode.Castle.dll

2. Added follwing property in hibernate.cfg.xml

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

But still I am getting the same exception.

Answer 1

I had this error too. It fires when you don't copy the mapping file (hibernate.cfg.xml) to the build directory.

Solution:

• In Solution explorer, right click on the mapping file (hibernate.cfg.xml), choose Properties, then make sure that Copy To Output Directory has Copy if newer selected).

Answer 2

As Alex InTechno said, this might be the error in the definition of your Mapping files or in mapped entities. I experienced the same error, when I have forgot that all properties in mapped classes have to be defined as virtual.

public String Name {get;set;}
public virtual String Name { get; set; }