UDF to get the filename for File Sender Adapter

Question

Hi,
I had an requirement to get the  the Filename and map to the  target payload.
I had configured the File Sender Adapter settings in the ID
This is the following UDF i got from SDN.
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String ourSourceFileName = conf.get(key);
return  ourSourceFileName;
But when iam using this UDF iam getting an error
RuntimeException in Message-Mapping transformation: Exception:[java.lang.NullPointerException] in class com.sap.xi.tf._MM_ORDER_CRS_OB_SAP_PROXY_IB_ method Filename$[com.sap.aii.mappingtool.tf3.rt.Context@54e154e1]
Please help me in correcting the error.
Thanks
Srinivas

Answer 1

Hi Jayson,
actually, in the interface mapping, it doesn't give exception.
The DynamicConfiguration is a constant retrieved from the container object, so it will never be returned as null (given that the container object was instantiated).
Just the retrieved value will be null (since it was not previously set), but no exception occurs.
In the message mapping, the container object is never instantiated, and that's the reason for the NullPointerException.
Regards,
Henrique.