Attachment file not picked - File to Mail scenario

Question

Hi,
I'm just trying out the file to mail scenario as suggested in blog:
https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1685 [original link is broken] [original link is broken] [original link is broken]
I created a xml file as the main mail content(main.xml). And I also have an attachment file(txt) placed at the same location. The file adapter picks the mail.xml, but not the attachment txt file. I can see the mail in my inbox, with the mail.xml added as an attachment..
I have added the "additional files" in the File adapter configuration. Also in mail adapter configuration, I have checked "Keep attachments"
Are there any other configurations I'm missing out???
When I check in XI ABAP engine, sxmb_moni, I see the following error:
<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
  <SAP:Category>Application</SAP:Category>
  <SAP:Code area="MAPPING">EXCEPTION_DURING_EXECUTE</SAP:Code>
  <SAP:P1>com/sap/xi/tf/_Mail_MM_</SAP:P1>
  <SAP:P2>java.lang.NullPointerException</SAP:P2>
  <SAP:P3 />
  <SAP:P4 />
  <SAP:AdditionalText />
  <SAP:ApplicationFaultMessage namespace="" />
  <SAP:Stack>java.lang.NullPointerException thrown during application mapping com/sap/xi/tf/_Mail_MM_:</SAP:Stack>
  <SAP:Retry>M</SAP:Retry>
  </SAP:Error>

Answer 1

Hi,
Thanks for the quick response...
Prateek,
the mapping is fine in IR.
Sanjeev,
Making the optional parameter created a failure in the communication channel.
the error the file sender returns in XI runtime workbench is
"Error: java.lang.Exception: Add attachment: Mandatory additional payload file 'main.txt' not found!" though my attachment name is  "Attachment.txt" . I renamed the attachment file to "main.txt", and made necessary changes in Additional file configurations too...
I have the attachment in the same location as the main content xml file. Should I specify somewhere the location of my attachment file too?
Gabriel,
Very useful link. but I dont see the failure in sxmb_moni now, may be because the failure occurs at the Communication Channel level itself????
-Ajitha