Greetings,
I am using NHibernate 3.0.0 beta 2, and am trying to evolve some
prototype code that was using the "session per call" anti-pattern to
use a "session per request" approach. I soon noticed that after
implementing the session sharing, my unit tests started failing with
the following exception:
System.NullReferenceException : Object reference not set to an
instance of an object.
at NHibernate.Type.Int32Type.Next(Object current, ISessionImplementor
session) in d:\CSharp\NH\nhibernate\src\NHibernate\Type\Int32Type.cs:
line 77
at NHibernate.Engine.Versioning.Increment(Object version, IVersionType
versionType, ISessionImplementor session) in d:\CSharp\NH\nhibernate
\src\NHibernate\Engine\Versioning.cs: line 31
at
NHibernate.Event.Default.DefaultFlushEntityEventListener.GetNextVersion(FlushEntityEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\DefaultFlushEntityEventListener.cs: line 331
at
NHibernate.Event.Default.DefaultFlushEntityEventListener.ScheduleUpdate(FlushEntityEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\DefaultFlushEntityEventListener.cs: line 242
at
NHibernate.Event.Default.DefaultFlushEntityEventListener.OnFlushEntity(FlushEntityEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\DefaultFlushEntityEventListener.cs: line 45
at
NHibernate.Event.Default.AbstractFlushingEventListener.FlushEntities(FlushEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\AbstractFlushingEventListener.cs: line 161
at
NHibernate.Event.Default.AbstractFlushingEventListener.FlushEverythingToExecutions(FlushEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\AbstractFlushingEventListener.cs: line 60
at
NHibernate.Event.Default.DefaultDirtyCheckEventListener.OnDirtyCheck(DirtyCheckEvent
event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default
\DefaultDirtyCheckEventListener.cs: line 21
at NHibernate.Impl.SessionImpl.IsDirty() in d:\CSharp\NH\nhibernate\src
\NHibernate\Impl\SessionImpl.cs: line 1510
The failures happened at "random" times, such as when I was about
to execute a query and NHibernate would do a dirty check. So I added
asserts for session.IsDirty() to try to catch the problem earlier, but
I still don't see an obvious cause. The odd thing is, the version
property should not be incrementing, since I am only doing read-only
work within the session so far. For example, the following code fails:
Assert.IsFalse(session.IsDirty());
var query = session.CreateQuery("from " + typeof(T).Name);
var list = query.List<T>();
Console.WriteLine(" HQL query: {0} " + typeof(T).Name + "
objects found", list.Count());
Assert.AreEqual(_rowCount, list.Count()); // value cached
in test setup
Assert.IsFalse(session.IsDirty());
I have been looking at this all afternoon, and tried to recreate
the problem by pasting similar unit test code into the
NHibernate.Test.VersionTest unit tests. (No luck yet.) Also, I tried
doing a "session.Clear()" before running this code, (which I thought
might solve the problem if there was stale data in the session) but it
had no effect.
I'm running out of ideas... does anyone have any thoughts on what
to look at next?
Thanks,
Mike
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