NHibernate Validator throws System.NotSupportedException after upgrading to 3.1 - nhibernate

Question

Has anyone encountered this?
After upgrading to NHibernate 3.1, I am receiving the following exception from NHibernate Validator when running NUnit test cases:
System.NotSupportedException : The invoked member is not supported in
a dynamic assembly. at
System.Reflection.Emit.InternalAssemblyBuilder.GetManifestResourceStream(String
name) at
NHibernate.Validator.Cfg.XmlMappingLoader.AddResource(Assembly
assembly, String resource) at
NHibernate.Validator.Cfg.XmlMappingLoader.GetXmlMappingFor(Type type)
at
NHibernate.Validator.Engine.JITClassMappingFactory.GetExternalDefinitionFor(Type
type) at
NHibernate.Validator.Engine.JITClassMappingFactory.GetClassMapping(Type
clazz, ValidatorMode mode) at
NHibernate.Validator.Engine.ClassValidator.InitValidator(Type clazz,
IDictionary`2 nestedClassValidators) at
NHibernate.Validator.Engine.ClassValidator..ctor(Type clazz,
IConstraintValidatorFactory constraintValidatorFactory, IDictionary`2
childClassValidators, IClassValidatorFactory factory) at
NHibernate.Validator.Engine.StateFullClassValidatorFactory.GetRootValidator(Type
type) at
NHibernate.Validator.Engine.ValidatorEngine.GetClassValidator(Type
entityType) at
NHibernate.Validator.Engine.ValidatorEngine.GetElementOrNew(Type
entityType) at
NHibernate.Validator.Engine.ValidatorEngine.InternalValidate(Object
entity, Object[] activeTags) at
NHibernate.Validator.Engine.ValidatorEngine.Validate(Object entity,
Object[] activeTags) at
NHibernate.Validator.Event.ValidateEventListener.Validate(Object
entity, EntityMode mode) at
NHibernate.Validator.Event.ValidatePreUpdateEventListener.OnPreUpdate(PreUpdateEvent
event) at NHibernate.Action.EntityUpdateAction.PreUpdate() in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Action\EntityUpdateAction.cs:
line 200 at NHibernate.Action.EntityUpdateAction.Execute() in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Action\EntityUpdateAction.cs:
line 58 at NHibernate.Engine.ActionQueue.Execute(IExecutable
executable) in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line
136 at NHibernate.Engine.ActionQueue.ExecuteActions(IList list) in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line
126 at NHibernate.Engine.ActionQueue.ExecuteActions() in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs: line
170 at
NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource
session) in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\AbstractFlushingEventListener.cs:
line 241 at
NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent
event) in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEventListener.cs:
line 19 at NHibernate.Impl.SessionImpl.Flush() in
d:\CSharp\NH\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs: line
1472 at TestDataAccess.FooTest.TestFoo() in FooTest.cs
As you can see from the stack trace, the error occurs when the session is flushed and NHibernate Validator does its thing.
Update I have tried stepping through the NH Validator code and it appears that at some point it is trying to validate the Castle proxy of an entity, rather than the underlying entity itself. This then causes the trouble. No idea what to do about this...
Update The problem goes away if I use the LinFu ProxyFactoryFactory, rather than Castle. Unfortunately, LinFu is giving me other problems so I don't want to use it.

Answer 1

NHibernate 3.2 removed the need for external proxy libraries.
They are still supported, but they are not distributed anymore, and the default is to use an internal implementation.
Have you tried upgrading?
Update: in order to compile NHibernate Validator for NH 3.2, you need to modify NHibernateHelper as follows:
public static bool IsProxyFactoryConfigurated()
{
var f = NHibernate.Cfg.Environment.BytecodeProvider.ProxyFactoryFactory;
return f != null;
}
For details, read NHV-116