Runtime constant (Filename) errors out in BPM

Question

Hi,
I have a BPMCollectTime scenario to collect the Source files. The filename (Message Mapping/Transformation) from the files is captured in TRANSFORM STEP(before sending them out from BPM). The file is sent to SEND step one at a time.
Question : Filename of the source file is captured through user defined function.
Following is the code.
================
String  v_result_time;          //test Variable
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key =  DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
if (key == null) { v_result_time= "Create Key Failed";}
else
{v_result_time= "Create Key worked";
String valueOld = conf.get(key);
v_result_time = valueOld;
return v_result_time;
The Mapping gives a runtime error in the BPM. This is a sporadic error. 
I have selected the Adapter specific attribute(File name).
The BPM errors out sometimes? I am not sure if I am missing any setting. If I delete the work item and run the same scenario it works.
Question 1 : What is the cause of the above error?
Question 2 : Does BPM support Adapter specific attribute such as filename?
Kindly Advice.
Thanks,
Gowri

Answer 1

Hi Everyone,
Thanks for all the help.
DTN will not change the response filename to source filename. This option cannot be used. The correlation id is defined as response file name. Response filename is fixed for invoice file.
Here is the example.
For invoice file name HDTN20070430163110.TXT, response file received is nav1_2b5.rsp file. For HDTN20070430163314.TXT , response file is nav1_2b5.rsp
So my correlation id is dummy fixed value. I have known the fact that it is not possible to use context object filename.
Bhavesh -  I have defined transform step for accessing filename using dynamic configuration. Following is the code used in mapping.
================
String v_result_time; //test Variable
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
if (key == null) { v_result_time= "Create Key Failed";}
else
{v_result_time= "Create Key worked";
String valueOld = conf.get(key);
v_result_time = valueOld;
return v_result_time;
====================================
BPM errors out sometime with following error
Component mapping has returned error.
com/sap/xi/tf/_MM_DTNData_2_DTNFilename_java.lang.NullpointerException.
Error: Exception CX_MERGE_SPLIT occurred (program: CL_MERGE_SPLIT_SERVICE========CP, include: CL_
If I delete this workitem and repeat the same scenario, it works. I have still not understood, why the scenario works sometime.
Kindly Advice.
Thanks,
Gowri