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Asked: 2026-05-10T15:18:06+00:00

Now, before you say it: I did Google and my hbm.xml file is an

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Now, before you say it: I did Google and my hbm.xml file is an Embedded Resource.

Here is the code I am calling:

ISession session = GetCurrentSession(); var returnObject =  session.Get<T>(Id);

Here is my mapping file for the class:

<?xml version='1.0' encoding='utf-8' ?> <hibernate-mapping xmlns='urn:nhibernate-mapping-2.2'>   <class name='HQData.Objects.SubCategory, HQData' table='SubCategory' lazy='true'>     <id name='ID' column='ID' unsaved-value='0'>       <generator class='identity' />     </id>      <property name='Name' column='Name' />     <property name='NumberOfBuckets' column='NumberOfBuckets'  />     <property name='SearchCriteriaOne' column='SearchCriteriaOne' />      <bag name='_Businesses' cascade='all'>       <key column='SubCategoryId'/>       <one-to-many           class='HQData.Objects.Business, HQData'/>     </bag>      <bag name='_Buckets' cascade='all'>       <key column='SubCategoryId'/>       <one-to-many          class='HQData.Objects.Bucket, HQData'/>     </bag>    </class> </hibernate-mapping>

Has anyone run to this issue before?

Here is the full error message:

MappingException: No persister for:  HQData.Objects.SubCategory]NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName, Boolean throwIfNotFound)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionFactoryImpl.cs:766 NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionFactoryImpl.cs:752 NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent event, LoadType loadType)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Event\Default\DefaultLoadEventListener.cs:37 NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionImpl.cs:2054 NHibernate.Impl.SessionImpl.Get(String entityName, Object id)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionImpl.cs:1029 NHibernate.Impl.SessionImpl.Get(Type entityClass, Object id)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionImpl.cs:1020 NHibernate.Impl.SessionImpl.Get(Object id)  in c:\CSharp\NH2.0.0\nhibernate\src\NHibernate\Impl\SessionImpl.cs:985 HQData.DataAccessUtils.NHibernateObjectHelper.LoadDataObject(Int32 Id)  in C:\Development\HQChannelRepo\HQ Channel Application\HQChannel\HQData\DataAccessUtils\NHibernateObjectHelper.cs:42 HQWebsite.LocalSearch.get_subCategory()  in C:\Development\HQChannelRepo\HQ Channel Application\HQChannel\HQWebsite\LocalSearch.aspx.cs:17 HQWebsite.LocalSearch.Page_Load(Object sender, EventArgs e)  in C:\Development\HQChannelRepo\HQ Channel Application\HQChannel\HQWebsite\LocalSearch.aspx.cs:27 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +33 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +47 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

Update, here’s what the solution for my scenario was: I had changed some code and I wasn’t adding the Assembly to the config file during runtime.

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1 Answer

  1. Sounds like you forgot to add a mapping assembly to the session factory configuration..

    If you’re using app.config…

    . .     <property name='show_sql'>true</property>     <property name='query.substitutions'>true 1, false 0, yes 'Y', no 'N'</property>     <mapping assembly='Project.DomainModel'/>  <!-- Here --> </session-factory> . .
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