Alan Northam

After setting up the database and building the solution, I launched the web site; and then I started to sign up a user, but soon after I clicked the button I got a very common .NET exception:

Server Error in '/NHBlog.WebUI' Application.

--------------------------------------------------------------------------------

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 92: public override string ApplicationName

Line 93: {

Line 94: get { return application.ApplicationName; }

Line 95: set { application = new DaoFactory().GetApplicationDao().GetByApplicationName(value); }

Line 96: }

Source File: G:\Resources\orm\NHibernate\NHBlog\NHBlog.DataAccess\Security\NHibernateMembershipProvider.cs    Line: 94

Jack:

I forgot to mention that you have to manually create an application in the applications table.  Add one named NHBlog and that should fix your error.

I can't get this to work. It complaints about the membership providers type attribute in web.config. The error isn't in english but I guess an attempted translation to english would be something like "configuration error, failed under activation" (ish).

Alan, you rock, now error fixed! Thanks for this great series, and I am looking forward the next post... :P

- Jack

Tommy:

I don't think you are getting the real cause of the error in the output you are seeing.  Run dbgview (www.microsoft.com/.../debugview.mspx) while testing so you can capture the log4net output from NHibernate.  Look for the first exception thrown and it should give you a better idea of what's causing the problem.

Hi great reading I got this working after all, will analyze it further this weekend to really get NHibernate under my thumb. There's a small error in PostDetail.aspx.cs: here's the correct Page_Load, works if you replace it:

   protected void Page_Load(object sender, EventArgs e)

   {

       Post post = new DaoFactory().GetPostDao().GetById(postID);

       if (post != null && post.Comments == null)

       {

           foreach (Comment c in post.Comments)

           {

               log.Debug(c.Depth);

           }

       }

   }

Gerard,

Thanks for pointing that out.  I made some major changes to the underlying code in this project and was in a bit of a hurry to refactor the presentation.  You will probably find some more odd looking code :)

Alan,  

Thanks for all this work. The ZIP attached to this article appears to be corrupt or invalid.