NHibernate.MappingException: No persister

Question

I've got a problem doing updates with a stateless session and I'm wondering if anyone has seen something like this. (NHibernate 3.1).

I'm basically doing the following:

SomeEntity e = statelessSession.Get<SomeEntity>(id); 
e.SomeProperty = "a new value"; 
statelessSession.Update(e);

and I am getting the following error:

NHibernate.MappingException: No persister for: 
  Castle.Proxies.SomeEntityProxy 
  at NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String 
  entityName) 
  at NHibernate.Impl.StatelessSessionImpl.GetEntityPersister(String 
  entityName, Object obj) 
  at NHibernate.Impl.StatelessSessionImpl.Update(String entityName, 
  Object entity) 
  at NHibernate.Impl.StatelessSessionImpl.Update(Object entity)

The mapping -

class SomeEntityMap : ClassMap<SomeEntity>
{
    public SomeEntityMap()
    {           
        Table("Some_Entity");            
        Id(x => x.ID).Column("ID");         
        Map(x => x.Name).Column("NAME");
    }

I have stepped through in the debugger and can see that statelessSession.Get(id) is returning me a proxy. Is this correct?

anyone have any idea what is the problem ? Please share your view and suggestion.

Please can you provide the mapping for entity you are trying to update? — mickfold, Mar 09 '13 at 09:58
I've create an issue: https://nhibernate.jira.com/browse/NH-4040 — hazzik, Jun 24 '17 at 06:03

mickfold · Answer 1 · 2013-03-10T01:02:19.533

I did a test project as you outlined in your question and wasn't able to reproduce the issue. The only scenarios that I was able to reproduce the error were:

The location of the mappings haven't been specified when initializing the session factory, i.e. you are missing
```
Fluently.Configure()
  .Mappings(m => m.FluentMappings.AddFromAssemblyOf<SomeEntity>());
```
One of the properties of SomeEntity has been marked as lazy="no-proxy". More information can be found here.

NHibernate.MappingException: No persister

1 Answers1