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PONHibernate "Could not determine type for X" error
 

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    <p>After upgrading the NHibernate and FluentNHibernate DLLs in a project, I'm now getting a "Could not determine type for: MyApp.Domain.Entities.AppCategory" exception thrown when initializing the SessionFactory. The only change in my code was tweaking the implementation of ForeignKeyConvention to override the <code>GetKeyName ( Member member, Type type )</code> abstract method, instead of <code>GetKeyName ( PropertyInfo property, Type type )</code>.</p> <p>The upgraded DLLs were from 1.0.0.593 to 1.1.0.685 for FluentNHibernate, and from 2.1.0.4000 to 2.1.2.4000 for NHibernate. Part of the difficulty in finding a solution is the old age of the NHibernate version we're using, but that can't be changed, at least for now.</p> <p>I posted the full exception and all relevant code and configuration below. I apologize for the length, but I have no idea where the problem might be.</p> <p><strong>Full Exception</strong></p> <pre><code>FluentNHibernate.Cfg.FluentConfigurationException : An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail. ----&gt; FluentNHibernate.Cfg.FluentConfigurationException : An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail. ----&gt; NHibernate.MappingException : Could not compile the mapping document: (XmlDocument) ----&gt; NHibernate.MappingException : Could not determine type for: MyApp.Domain.Entities.AppCategory, MyApp.Domain, Version=1.0.0.76, Culture=neutral, PublicKeyToken=null, for columns: NHibernate.Mapping.Column(AppCategory) at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory() in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 98 at MyFramework.App.DataAccess.NHibernate.Databases.BaseDatabase.CreateSessionFactory() in C:\WIP\VSProjects\MyFramework\src\App\DataAccess\NHibernate\Databases\BaseDatabase.cs: line 115 at MyFramework.App.DataAccess.NHibernate.Databases.BaseDatabase.Init() in C:\WIP\VSProjects\MyFramework\src\App\DataAccess\NHibernate\Databases\BaseDatabase.cs: line 100 at MyApp.DataAccess.SmartStudioUserUnitOfWork.&lt;.ctor&gt;b__0() in SmartStudioUserUnitOfWork.cs: line 28 at MyFramework.App.DataAccess.NHibernate.UnitOfWork`1.Create(FlushMode flushMode) in C:\WIP\VSProjects\MyFramework\src\App\DataAccess\NHibernate\UnitOfWork.cs: line 72 at MyFramework.App.DataAccess.NHibernate.UnitOfWork`1..ctor(Func`1 getBaseDatabase) in C:\WIP\VSProjects\MyFramework\src\App\DataAccess\NHibernate\UnitOfWork.cs: line 37 at MyApp.DataAccess.SmartStudioUserUnitOfWork..ctor() in SmartStudioUserUnitOfWork.cs: line 17 at MyApp.DataAccess.Test.SmartStudioUserDaoTest.create_dao() in SmartStudioUserDaoTest.cs: line 20 --FluentConfigurationException at FluentNHibernate.Cfg.FluentConfiguration.BuildConfiguration() in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 119 at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory() in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 93 --MappingException at NHibernate.Cfg.Configuration.LogAndThrow(Exception exception) 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 d:\Builds\FluentNH\src\FluentNHibernate\PersistenceModel.cs: line 262 at FluentNHibernate.Automapping.AutoPersistenceModel.Configure(Configuration configuration) in d:\Builds\FluentNH\src\FluentNHibernate\Automapping\AutoPersistenceModel.cs: line 170 at FluentNHibernate.Cfg.AutoMappingsContainer.Apply(Configuration cfg) in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\AutoMappingsContainer.cs: line 84 at FluentNHibernate.Cfg.MappingConfiguration.Apply(Configuration cfg) in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\MappingConfiguration.cs: line 56 at FluentNHibernate.Cfg.FluentConfiguration.BuildConfiguration() in d:\Builds\FluentNH\src\FluentNHibernate\Cfg\FluentConfiguration.cs: line 110 --MappingException at NHibernate.Mapping.SimpleValue.get_Type() at NHibernate.Cfg.XmlHbmBinding.ClassBinder.BindProperty(XmlNode node, Property property, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.ClassBinder.CreateProperty(IValue value, String propertyName, String className, XmlNode subnode, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.ClassBinder.BindJoin(XmlNode node, Join join, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.ClassBinder.PropertiesFromXML(XmlNode node, PersistentClass model, IDictionary`2 inheritedMetas, UniqueKey uniqueKey, Boolean mutable, Boolean nullable, Boolean naturalId) at NHibernate.Cfg.XmlHbmBinding.RootClassBinder.Bind(XmlNode node, HbmClass classSchema, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddRootClasses(XmlNode parentNode, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.Bind(XmlNode node) at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc) </code></pre> <p><strong>Fluent Configuration</strong></p> <pre><code>sessionFactory = fluentConfiguration .Mappings(m =&gt; m.AutoMappings.Add( AutoMap.AssemblyOf&lt;Application&gt;().Conventions .Add&lt;CustomForeignKeyConvention&gt;())) .ExposeConfiguration(new SchemaExport(config).Create(true, false)) .BuildSessionFactory(); public class CustomForeignKeyConvention : ForeignKeyConvention { protected override string GetKeyName ( Member member, Type type ) { if (member == null) { return type.Name + "Id"; } return member.Name + "Id"; } } </code></pre> <p><strong>Domain classes</strong></p> <pre><code>public class Application { public virtual int Id { get; set; } public virtual string FriendlyName { get; set; } public virtual AppCategory AppCategory { get; set; } } public class AppCategory { public virtual int Id { get; private set; } public virtual string CategoryName { get; set; } } </code></pre> <p><strong>Database Table Definitions</strong></p> <pre><code>CREATE TABLE [dbo].[Application]( [Id] [int] IDENTITY(1,1) NOT NULL, [FriendlyName] [varchar](255) NOT NULL, [AppCategoryId] [int] NOT NULL, CONSTRAINT [PK_Application] PRIMARY KEY CLUSTERED ([Id] ASC) ) GO ALTER TABLE [dbo].[Application] WITH CHECK ADD CONSTRAINT [FK_Application_AppCategory] FOREIGN KEY([AppCategoryId]) REFERENCES [dbo].[AppCategory] ([Id]) GO ALTER TABLE [dbo].[Application] CHECK CONSTRAINT [FK_Application_AppCategory] GO CREATE TABLE [dbo].[AppCategory]( [Id] [int] IDENTITY(1,1) NOT NULL, [CategoryName] [nvarchar](50) NOT NULL, CONSTRAINT [PK_AppCategory] PRIMARY KEY CLUSTERED ([Id] ASC) ) </code></pre> <p><strong>Fluent NHibernate Mapping</strong></p> <pre><code>public class ApplicationMappingOverride : IAutoMappingOverride&lt;Application&gt; { public void Override(AutoMapping&lt;Application&gt; mapping) { mapping.Table("Application"); mapping.Id(x =&gt; x.Id); mapping.Map(x =&gt; x.FriendlyName); mapping.Join("AppCategory", x =&gt; x.Map(y =&gt; y.AppCategory)); } } </code></pre> <p><strong>Mapping XML (pulled from Fluent NHibernate log message):</strong></p> <pre><code>&lt;hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true"&gt; &lt;class xmlns="urn:nhibernate-mapping-2.2" mutable="true" name="MyApp.Domain.Entities.Application, MyApp.Domain, Version=1.0.0.76, Culture=neutral, PublicKeyToken=null" table="Application"&gt; &lt;id name="Id" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="Id" /&gt; &lt;generator class="identity" /&gt; &lt;/id&gt; &lt;property name="FriendlyName" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="FriendlyName" /&gt; &lt;/property&gt; &lt;join table="AppCategory"&gt; &lt;key&gt; &lt;column name="ApplicationId" /&gt; &lt;/key&gt; &lt;property name="AppCategory" type="MyApp.Domain.Entities.AppCategory, MyApp.Domain, Version=1.0.0.76, Culture=neutral, PublicKeyToken=null"&gt; &lt;column name="AppCategory" /&gt; &lt;/property&gt; &lt;/join&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre>
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