Output Attachment is null in Operation Mapping only while working fine in Message Mapping

[former_member183816]

Hi Eperts,

I have written this piece of code to create an output attachment in Message Mapping (not UDF), see screen. It's running fine in Message mapping. But it is getting failed in Operation mapping. See the reults and sample code below.

Message mapping Result:

DN File Attached

Operation Mapping Result:

outAtt is null

Error in Operation mapping:

com.sap.aii.mapping.api.StreamTransformationException: while trying to invoke the method com.sap.aii.mapping.api.OutputAttachments.create(java.lang.String, byte[]) of a null object loaded

Code:

public void transform(TransformationInput in, TransformationOutput out) throws StreamTransformationException {

        try{

                     OutputStream os = out.getOutputPayload().getOutputStream();

                    //creating output attachment

                    OutputAttachments outAtt = out.getOutputAttachments();

                    if (outAtt==null)

getTrace().addInfo("outAtt is null");

                    //File Names

                    String dnFileName="001DN.txt";

                    String CRLF = "\r\n";

String df="test attachment";

                    // Forming attachment for DN file

Attachment attDN = outAtt.create(dnFileName, df.getBytes());

                    if (attDN!=null)

                      {

                         outAtt.setAttachment(attDN);

                         getTrace().addInfo("DN File Attached");

                       }

                  else

                      getTrace().addInfo("DN File NOT Attached");

                    // forming Email Package

                      String emailPackage=

		"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+CRLF+
		"<ns:Mail xmlns:ns=\"http://sap.com/xi/XI/Mail/30\">"+CRLF+
		"<Subject>Delivery notes of CORUS</Subject>"+CRLF+
		"<From>test.com</From>"+CRLF+
		"<To>test.com</To>"+CRLF+
		"<Reply_To />"+CRLF+
		"<Content_Type>text/plain</Content_Type>"+CRLF+
		"<Content></Content>"+CRLF+
		"</ns:Mail>";

                      // writing Email Package

                     getTrace().addInfo("Writing Email Package");

                     os.write(emailPackage.getBytes());

                     os.flush();

                     os.close();

}

             catch (Exception e)

             {

                 throw new StreamTransformationException(e.getMessage());

             }

}

Can someone explain to me, why it's happening. Why outAtt is not null in Message mapping and null in Operation Mapping?

[RaghuVamseedhar · Accepted solution]

Ambuj,

Please set "Read Attachments" in operation mapping and follow below code

[former_member183816 · Accepted solution]

Thank you for the reply.

I think my code is exactly same as you suggested in that link,

As per your code,

 transformationOutput.getOutputAttachments().create("FileAttachment", b); 

I will get null exception due to this handler method of OutputAttachment. interface. Because no input attachment is there in my source message.

transformationOutput.getOutputAttachments()

Also read attachment check box is meant to read input attachment, in my case it's null. I had already tried checking that option.

"And it's failing in my operation mapping only. When I am running my message/java mapping, attachment is successful"

By the way I will explore your links/suggestions and award you if it works.

Thanks again!.

[RaghuVamseedhar · Accepted solution]

Ambuj,

Ideally attachment should be created, with both codes. You can try below code in tranform method

transformationOutput.getOutputAttachments().create("FileAttachment", "Something".getBytes());
transformationOutput.getOutputHeader().setContentType("Filename.txt"); 
transformationOutput.getOutputPayload().getOutputStream().write("Something else"".getBytes());

Message was edited by: Raghu Vamseedhar Reddy KadipiReddy

[former_member183816 · Accepted solution]

No, it's not working (Also tried with checking read attachment box)

As I already mentioned, while running in operation mapping this object is null.

FYI.I placed a check on this object in message mapping, there, it is not null.

I will try another aproach as per this blog.

[engswee · Accepted solution]

Ambuj

I don't think you can test this out in ESR, that is why you are getting inconsistent behavior. Try testing this in an end-to-end scenario instead.

Rgds

Eng Swee

[RaghuVamseedhar · Accepted solution]

Ambuj,

Can you try the normal Java mapping (not ESR java mapping)?

[former_member183816 · Accepted solution]

Already tried that. Same results.

Let me test it end to end as  Eng suggested. Ill share the results.