Exception: Mapping exception.

MEvo · **Joined:** Mon Sep 17, 2007 5:01 am **Posts:** 4

Hi everyone, I've got a problem when I tried to map the hbm.xml file with the .cs file. When I launch the program I've got a MappingException:

Resource not found: Cat.hbm.xml

I can't figure out why it doesn't work with my code.
If someone can help me, I'll be grateful :D

Thanks.

Hibernate version: 1.2.0

Files:

App.conf

Code:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <configSections>
    <section
      name="hibernate-configuration"
      type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"
    />
  </configSections>

  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>

      <property name="dialect">
        NHibernate.Dialect.MsSql2005Dialect
      </property>
      <property name="connection.provider">
        NHibernate.Connection.DriverConnectionProvider
      </property>
      <property name="connection.connection_string">
        Server=(localhost);initial catalog=Quickstart;Integrated Security=SSI
      </property>
      
      <mapping assembly="Quickstart" />
      <mapping resource="Cat.hbm.xml" assembly="Quickstart" />
    </session-factory>
  </hibernate-configuration>

</configuration> 

Cat.hbm.xml

Code:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Quickstart" assembly="Quickstart">
  
  <class name="Cat" table="Cat">

    <id name="Id" column="CatId" type="Char" length="32">
      <generator class="assigned" />
    </id>

    <property name="Name" column="Name" type="String" length="40" not-null="true" />
    <property name="Sex" column="Sex" type="Char" length="1" not-null="false"/>

  </class>
  
</hibernate-mapping>

Cat.cs

Code:

using System;
using System.Collections.Generic;
using System.Text;

namespace Quickstart
{
    public class Cat
    {
        private string id;
        private string name;
        private char sex;

        public Cat()
        {
        }
        public string Id
        {
            get { return id; }
            set { id = value; }
        }
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public char Sex
        {
            get { return sex; }
            set { sex = value; }
        }
    }
}

Program.cs

Code:

Configuration cfg = new Configuration();
cfg.Configure(); // <-- Crash here
ISessionFactory factory = cfg.BuildSessionFactory();
ISession session = factory.OpenSession();
...

Full stack trace of any exception that occurs:

" at NHibernate.Cfg.Configuration.LogAndThrow(MappingException me)\r\n at NHibernate.Cfg.Configuration.AddResource(String path, Assembly assembly)\r\n at NHibernate.Cfg.Configuration.DoConfigure(XmlDocument doc)\r\n at NHibernate.Cfg.Configuration.Configure(XmlTextReader reader)\r\n at NHibernate.Cfg.Configuration.Configure(XmlNode node)\r\n at NHibernate.Cfg.Configuration.Configure()\r\n at Quickstart.Program.Main(String[] args) in C:\\Documents and Settings\\dde\\My Documents\\Visual Studio 2005\\Projects\\Quickstart\\Quickstart\\Program.cs:line 18\r\n at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)\r\n at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)\r\n at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()\r\n at System.Threading.ThreadHelper.ThreadStart_Context(Object state)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n at System.Threading.ThreadHelper.ThreadStart()"

jlockwood · **Posted:** Mon Sep 17, 2007 9:28 am

Do you have Cat.hbm.xml set as an embedded resource (in file's properties)? You need it to be embedded so that NHibernate can retrieve it from the assembly manifest.

MEvo · **Joined:** Mon Sep 17, 2007 5:01 am **Posts:** 4

Yes, I've added Cat.hbm.xml as an embedded ressource :)

jlockwood · **Posted:** Mon Sep 17, 2007 1:23 pm

In your NHibernate config, you need to make sure that you specify your mapping assemblies:

Code:

  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
...
      [b]<mapping assembly="My.Assembly.Name" />[/b]
    </session-factory>
  </hibernate-configuration>

Otherwise you would have to specify the assembly programatically in your code.

marcal · **Posted:** Mon Sep 17, 2007 1:47 pm

MEvo, if those suggestions don't work, two other thoughts:

First, if you are using Visual Studio to build, and you added Cat.hbm.xml as a resource after your initial build, then building again will do nothing--VS doesn't include resource changes when considering whether a project has "changed" or not. You need to go to the Build menu and Rebuild the solution, which forces recompilation.

Second, check for the resource in the assembly manifest using ildasm.exe. Just because the file name is Cat.hbm.xml, doesn't mean that is the resource name. It may have prepended the directory or something, like Quickstart.Cat.hbm.xml.

jlockwood · **Posted:** Mon Sep 17, 2007 2:20 pm

marcal wrote:

First, if you are using Visual Studio to build, and you added Cat.hbm.xml as a resource after your initial build, then building again will do nothing--VS doesn't include resource changes when considering whether a project has "changed" or not. You need to go to the Build menu and Rebuild the solution, which forces recompilation.

Totally true, in fact this can be troublesome at any time when you after mapping files only and then build. I tend to rebuild as a habit when building my assemblies with mapping files embedded within.

Now, by bad. I get the bad code reader award of the day. Reading through the config, I see this:

Quote:

You shouldn't need to specify all your mapping files in your config, but if you did the names would have to be fully qualified. I'd first try removing the resource mapping and leave <mapping assembly="Quickstart" />. If you did use <mapping resource="Cat.hbm.xml" assembly="Quickstart" /> for each of you mapped classes I don't think you'd need <mapping assembly="Quickstart" />.

Let me know how it all works out.

MEvo · **Joined:** Mon Sep 17, 2007 5:01 am **Posts:** 4

I rebuild my solution and as you said in my app.config I removed the other mappings and now I've only the <mapping assembly="Quickstart" /> mapping. I thought I tried this solution, it seems not because now it works :D

Thanks to you all.

jlockwood · **Posted:** Tue Sep 18, 2007 6:42 am

Great! And don't forget to rate the postings that help you (not just mine).