Dynamic File name SFTP (SFTP ADAPTER 1.0)

Hello,

I am using simple SFTP (SFTP ADAPTER 1.0) to proxy scenario in our SAP PO.

I am trying to assign source file name using below UDF:

public String getFileName(Container container) throws StreamTransformationException{

try{

DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);

DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");

String SourceFileName = conf.get(key);

if( SourceFileName == " "  )

{

SourceFileName  =  " LTB_CBUR_MissingFile" ;

}

conf.put(key, SourceFileName);

}

catch  (Exception e)

{

String exception = e.toString(); 

return exception; 

} 

return "1"; 

We are getting null pointer exception.. I have tick marked set adapter specific message attributes on sender CC.

Thank you

John