How do you figure out NHibernate.DuplicateMappingException?

Asbjørn Ulsberg

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Sep 1, 2011, 9:57:24 AM9/1/11

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After upgrading to NHibernate 3.2 and a build of FNH 1.3 (against NHibernate 3.2), I'm getting NHibernate.DuplicateMappingException for an entity. I've written out all mappings in the AutoPersistenceModel to file, but I can't find a duplicate. I've seen people experiencing this where `table="Entity"` is repeated too many places, but can't find this in my mappings.

How do I best debug this problem? Is there something internally in FNH I can poke at to get at the information before NHibernate throws? I find it incredibly annoying that NHibernate can't just tell me what the duplicate is, but that is just the nature of NHibernate exceptions, I guess.

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Asbjørn Ulsberg

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Sep 5, 2011, 5:27:10 AM9/5/11

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Through the Diagnostics() method on FluentConfiguration I've figured out that for whatever reason, "ScannedSources" contains the same assembly twice and "FluentMappings" contains the class mappings from that assembly twice as well. So since "FluentMappings" contains duplicates, I guess those duplicates are fed to NHibernate which then throws.

Whether this is new behavior on FNH or NHibernate's part, I don't know, but this is code that worked in NHibernate 2.8 and FNH 1.1 that doesn't work anymore because NHibernate throws DuplicateMappingException. Any ideas how I can figure out why my mapping assembly is scanned twice and why mappings are duplicated? Wouldn't it be smart of FNH to do a .Distinct() before adding mappings to NHibernate?

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James Gregory

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Sep 5, 2011, 8:11:13 AM9/5/11

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Could you show your configuration code? There were some issues with the Mappings method being called multiple times before.

Asbjørn Ulsberg

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Sep 5, 2011, 8:37:28 AM9/5/11

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Providing my configuration code is difficult, but if there's no other way to go about this, I can of course try to create a failing test in FNH. That's going to take hours of work, though (it's hundreds of mappings), so I would love to be able to figure this out by other means first. Most of the stack trace is as follows:

--FluentConfigurationException

at FluentNHibernate.Cfg.FluentConfiguration.BuildConfiguration() in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 264

at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory() in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 230

--MappingException

at NHibernate.Cfg.Configuration.LogAndThrow(Exception exception)

at NHibernate.Cfg.Configuration.AddDeserializedMapping(HbmMapping mappingDocument, String documentFileName)

at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc)

at NHibernate.Cfg.Configuration.ProcessMappingsQueue()

at NHibernate.Cfg.Configuration.AddDocumentThroughQueue(NamedXmlDocument document)

at NHibernate.Cfg.Configuration.AddXmlReader(XmlReader hbmReader, String name)

at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream, String name)

at NHibernate.Cfg.Configuration.AddDocument(XmlDocument doc, String name)

at NHibernate.Cfg.Configuration.AddDocument(XmlDocument doc)

at FluentNHibernate.PersistenceModel.Configure(Configuration cfg) in PersistenceModel.cs: line 293

at FluentNHibernate.Automapping.AutoPersistenceModel.Configure(Configuration configuration) in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Automapping\AutoPersistenceModel.cs: line 201

at FluentNHibernate.Cfg.AutoMappingsContainer.Apply(Configuration cfg, PersistenceModel model) in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Cfg\AutoMappingsContainer.cs: line 86

at FluentNHibernate.Cfg.MappingConfiguration.Apply(Configuration cfg) in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Cfg\MappingConfiguration.cs: line 85

at FluentNHibernate.Cfg.FluentConfiguration.BuildConfiguration() in D:\AUL\Dev\Misc\fluent-nhibernate\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 252

--DuplicateMappingException

at NHibernate.Cfg.Mappings.AddClass(PersistentClass persistentClass)

at NHibernate.Cfg.XmlHbmBinding.SubclassBinder.HandleSubclass(PersistentClass model, HbmSubclass subClassMapping, IDictionary`2 inheritedMetas)

at NHibernate.Cfg.XmlHbmBinding.ClassBinder.BindSubclasses(IEnumerable`1 subclasses, PersistentClass persistentClass, IDictionary`2 inheritedMetas)

at NHibernate.Cfg.XmlHbmBinding.RootClassBinder.Bind(HbmClass classSchema, IDictionary`2 inheritedMetas)

at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddRootClasses(HbmClass rootClass, IDictionary`2 inheritedMetas)

at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddEntitiesMappings(HbmMapping mappingSchema, IDictionary`2 inheritedMetas)

at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.Bind(HbmMapping mappingSchema)

at NHibernate.Cfg.Configuration.AddDeserializedMapping(HbmMapping mappingDocument, String documentFileName)

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Asbjørn Ulsberg -=|=- asb...@ulsberg.no
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On mandag 5. september 2011 at 14:11, James Gregory wrote:

Could you show your configuration code? There were some issues with the Mappings method being called multiple times before.

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James Gregory

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Sep 5, 2011, 9:55:06 AM9/5/11

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Ok, that's fair enough. Nothing immediately obvious in the stack trace. Tell me, are you using Fluently.Configure? And are you creating multiple instances of it or doing everything within one?

Asbjørn Ulsberg

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Sep 5, 2011, 10:20:05 AM9/5/11

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Yea, I'm using Fluently.Configure(). The configuration code (without the mappings) looks like this:

NHibernate.Cfg.Configuration configuration = GetConfiguration();

FluentConfiguration fluentConfiguration = Fluently.Configure(configuration);

fluentConfiguration.Diagnostics(SetupDiagnostics);

AddListenersTo(configuration);

fluentConfiguration.Mappings(ConfigureMapping);

try

{

this.sessionFactory = fluentConfiguration.BuildSessionFactory();

this.configured = true;

}

catch (Exception exception)

{

throw;

}

It's the BuildSessionFactory() that fails, and even though it's only invoked once, the Diagnostics() stuff is invoked twice; first without much data at all, second with too much (duplicate assembly and fluent mappings).

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Asbjørn Ulsberg -=|=- asb...@ulsberg.no
«He's a loathsome offensive brute, yet I can't look away»

On mandag 5. september 2011 at 15:55, James Gregory wrote:

Ok, that's fair enough. Nothing immediately obvious in the stack trace. Tell me, are you using Fluently.Configure? And are you creating multiple instances of it or doing everything within one?

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Asbjørn Ulsberg

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Sep 5, 2011, 10:35:23 AM9/5/11

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Not sure how valuable it is, but this is the call stack for the two different times my diagnostics code is invoked:

DiagnosticListener.Format(FluentNHibernate.Diagnostics.DiagnosticResults results) Line 127

DiagnosticListener.Receive.AnonymousMethod__0(Common.Logging.FormatMessageHandler f) Line 35 + 0x11 bytes

DiagnosticListener.Receive(FluentNHibernate.Diagnostics.DiagnosticResults results) Line 35 + 0x33 bytes

FluentNHibernate.DLL!FluentNHibernate.Diagnostics.DefaultDiagnosticMessageDespatcher.Publish(FluentNHibernate.Diagnostics.DiagnosticResults results) Line 18 + 0xc bytes

FluentNHibernate.DLL!FluentNHibernate.Diagnostics.DefaultDiagnosticLogger.Flush() Line 28 + 0xf bytes

FluentNHibernate.DLL!FluentNHibernate.PersistenceModel.BuildMappings() Line 171 + 0xc bytes

FluentNHibernate.DLL!FluentNHibernate.Automapping.AutoPersistenceModel.BuildMappings() Line 136 + 0x8 bytes

FluentNHibernate.DLL!FluentNHibernate.PersistenceModel.EnsureMappingsBuilt() Line 221 + 0xe bytes

FluentNHibernate.DLL!FluentNHibernate.PersistenceModel.Configure(NHibernate.Cfg.Configuration cfg) Line 277 + 0x8 bytes

FluentNHibernate.DLL!FluentNHibernate.Automapping.AutoPersistenceModel.Configure(NHibernate.Cfg.Configuration configuration) Line 201 + 0xb bytes

FluentNHibernate.DLL!FluentNHibernate.Cfg.AutoMappingsContainer.Apply(NHibernate.Cfg.Configuration cfg, FluentNHibernate.PersistenceModel model) Line 86 + 0xb bytes

FluentNHibernate.DLL!FluentNHibernate.Cfg.MappingConfiguration.Apply(NHibernate.Cfg.Configuration cfg) Line 85 + 0x1e bytes

FluentNHibernate.DLL!FluentNHibernate.Cfg.FluentConfiguration.BuildConfiguration() Line 252 + 0x2a bytes

FluentNHibernate.DLL!FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory() Line 230 + 0x8 bytes

Configurator.DoConfigure(System.Func<NHibernate.Cfg.Configuration,NHibernate.Cfg.Configuration> configurationFunc) Line 120 + 0x13 bytes

Configurator.Configure() Line 183 + 0xd bytes

PersistenceModelBaseTests.AfterConfiguring_TypesAreExcludedInAutomappingConfiguration() Line 59 + 0x8 bytes

And: