Transform method in the Expression shape throws an exception "Object reference not set to an instance of an object"

Question

Am using VisualStudio 2010. In my orchestration am using expressions to dynamically transform messages.

construct outputmsg    
{
 System.Diagnostics.EventLog.WriteEntry("INTERFACE","Entered construct ..." );
 transform (outputmsg) = oMap(Inputmsg);
 System.Diagnostics.EventLog.WriteEntry("INTERFACE","after transform ..." );
}

Now I encounter the following error

"Object reference not set to an instance of an object"

In BizTalk eventlog I noticed => Entered construct .. ,which means its entering construct method. But after that exception is thrown.

I think "transform" is giving an error.

I have the corresponding mapping file (used in transform) in my solution

Where am I going wrong? Any suggestions would be really helpful.

Thanks in advance.

http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it — Soner Gönül, Feb 20 '14 at 12:32
To narrow it down, you should attach Visual Studio to BTSNTSvc.exe and see where it breaks. — Johns-305, Feb 20 '14 at 12:44

score 1 · Answer 1 · answered Feb 21 '14 at 12:24

1

Have you initialized oMap variable using

oMap = typeof(MapName);

See more details on http://msdn.microsoft.com/en-us/library/aa950573.aspx

answered Feb 21 '14 at 12:24

Vikas Bhardwaj

1,405
8
10

Yes Vikas. I initialized oMap variable using oMap = System.Type.GetType(MapName); where MapName is supposed to "TypeName" of a Map. Instead I gave map name. I went wrong here. I corrected it. It works fine now. Thank you :) – Nikki Feb 24 '14 at 04:07

Transform method in the Expression shape throws an exception "Object reference not set to an instance of an object"

1 Answers1