Hi
I am new to NHibernate and have just download NHibernate 3.0.0. I have followed some tutorials and checked out the Summer of NHibernate videos so feel that I have a grasp of the concepts and implementation but I am currently stumbling on a problem where NHibernate is throwing an exception stating that it is unable to locate a persister for one of my types.
I have a solution structure as follows:
DataTransferObjects (Class library project). This contains a simple object called History (code below)
Code:
namespace Venus.DataTransferObjects.History
{
public class History
{
/// <summary>Gets/Sets the unique identifier of this history item</summary>
/// <returns>Integer</returns>
public virtual Int32 HistoryId { get; set; }
/// <summary>Gets/Sets the unique identifier of the history type that this history item relates to</summary>
/// <returns>Integer</returns>
public virtual Int32 HistoryTypeId { get; set; }
/// <summary>Gets/Sets the unique identifier of the item that has changed</summary>
/// <returns>Integer</returns>
/// <remarks>The item is determined by the HistoryTypeId, therefore an Issue would be identifier by this identifier it the history type related to an issue</remarks>
public virtual Int32 Identifier { get; set; }
/// <summary>Gets/Sets the old value of this history item</summary>
/// <returns>String</returns>
public virtual String OldValue { get; set; }
/// <summary>Gets/Sets the new value of this history item</summary>
/// <returns>String</returns>
public virtual String NewValue { get; set; }
/// <summary>Gets/Sets the date this history item was created</summary>
/// <returns>Nullable(Of Date)</returns>
public virtual DateTime CreatedDate { get; set; }
/// <summary>Returns the NewValue of this history</summary>
/// <returns>String</returns>
public override string ToString()
{
return this.NewValue;
}
}
}
and I have a mapping file in the same location called History.hbm.xml containing the following:
Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataTransferObjects" namespace="Venus.DataTransferObjects.History">
<class name="History" table="History">
<id name="HistoryId" column="HistoryID" type="Int32" unsaved-value="0">
<generator class="identity"></generator>
</id>
<property name="HistoryTypeId" column="HistoryTypeID" type="Int32" not-null="true" />
<property name="Identifier" column="Identifier" type="Int32" not-null="true" />
<property name="OldValue" column="OldValue" type="String" not-null="false" />
<property name="NewValue" column="NewValue" type="String" not-null="false" />
<property name="CreatedDate" column="CreatedDate" type="DateTime" not-null="false" />
</class>
</hibernate-mapping>
The Assembly name for this project is set to "DataTransferObjects" and the Default namespace is set to "Venus".
Next I have a DataAccessLayer project (Class Library) which contains one provider class as follows:
Code:
namespace Venus.DataAccessLayer.History
{
public class HistoryDataProvider
{
public DataTransferObjects.History.History GetHistoryById(Int32 historyId)
{
// Create a configuration object and have it configure itself, then buld a session factory based on this configuration
NHibernate.ISessionFactory sessionFactory = (new NHibernate.Cfg.Configuration()).Configure().BuildSessionFactory();
NHibernate.ISession session = sessionFactory.OpenSession();
return session.Get<Venus.DataTransferObjects.History.History>(historyId);
}
}
}
The Assembly name for this project is "DataAccessLayer" and the Default namespace is "Venus".
I have also made the following references for this project:
Antlr3.Runtime
Castle.Core
Castle.DynamicProxy2
DataTransferObjects
Iesi.Collections
LinFu.DynamicProxy
log4net
NHibernate
NHibernate.ByteCode.Castle
NHibernate.ByteCode.LinFu
Remotion.Data.Linq
The next project is called ServiceLayer (Class library) and contains one class:
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Venus.ServiceLayer.History
{
public class History
{
public DataTransferObjects.History.History GetHistoryById(Int32 historyId)
{
Venus.DataAccessLayer.History.HistoryDataProvider provider = new Venus.DataAccessLayer.History.HistoryDataProvider();
return provider.GetHistoryById(historyId);
}
}
}
This is just simple at the moment but will be used for validation etc. at a later time.
Finally I have a DataAccessLayerTests project (Class library) which I am using as the runner for this application at the moment. This contains one test class called HistoryTests as follows:
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NUnit.Framework;
namespace Venus.DataAccessLayerTests.History
{
[TestFixture]
public class HistoryTests
{
[Test]
public void CanGetHistoryItemById()
{
Venus.ServiceLayer.History.History service = new Venus.ServiceLayer.History.History();
Venus.DataTransferObjects.History.History history = service.GetHistoryById(1);
}
}
}
There are currently no asserts as yet.
I have made the following references to this project:
log4net
NHibernate
NHibernate.ByteCode.Castle
NHibernate.ByteCode.LinFu
nunit.Framework
Remotion.Data.Linq
ServiceLayer
This project also contains the hibernate.cfg.xml file as follows:
Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory name="VenusSQL2008">
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="connection.connection_string">Data Source=(local);Initial Catalog=Venus;Integrated Security=true</property>
<property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
<property name="show_sql">true</property>
<property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
</session-factory>
</hibernate-configuration>
When I run this test in the debugger I receive the exception "Unable to locate persister: Venus.DataTransferObjects.History.History". I am unsure if this is a problem with my namespaces or a configuration issue but I am having difficulty finding much information on the web regarding this.
Any help would be much appreciated.
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