BPEL - FTP Adapter writes XML file without prefix in the root element

Problem:

When writing a file using the FTP adapter with the message schema defined, for some reason the output would come out without a prefix in the root element, like so:

This would happen even with the XSL transformation declaring the prefix in the root element:



I'm not sure if it's a bug or the fact that we have our schema/transformation wrong, but a coworker and I just couldn't get it to work, so we opted for a workaround using Java embedding.

Solution:

We used the following code to add the prefix to the root element by transforming the XML into a string:

 try{   
   oracle.xml.parser.v2.XMLElement responseFile = (oracle.xml.parser.v2.XMLElement)getVariableData("varResponseFile");   
   //setting prefix to root   
   oracle.xml.parser.v2.XMLNode firstChild = (oracle.xml.parser.v2.XMLNode)responseFile.getFirstChild();   
   responseFile.setPrefix(firstChild.getPrefix());   
   //getting xml document   
   oracle.xml.parser.v2.XMLDocument responseFileXML = (oracle.xml.parser.v2.XMLDocument)responseFile.getDocument();   
   //setting prologue   
   responseFileXML.setVersion("1.0");   
   responseFileXML.setEncoding("UTF-8");   
   //writing xml document   
   java.io.ByteArrayOutputStream outputStream = new java.io.ByteArrayOutputStream();   
   responseFileXML.print(outputStream );   
   String responseFileString = outputStream.toString();   
   //encode xml document   
   oracle.soa.common.util.Base64Encoder encoder = new oracle.soa.common.util.Base64Encoder();   
   String stringEnconded = null;   
   stringEnconded = encoder.encode(responseFileString);   
   //setting xml encoded   
   setVariableData("encodedBody",stringEnconded);   
 } catch (Exception e) {   
   addAuditTrailEntry("Error encoding Response File: " + e.getMessage());   
   throw new RuntimeException(e);   
 }  

We would of course change the FTP message schema to opaque instead. Applying this code would then write the XML file correctly:



If anyone knows how to do this without Java (or perhaps what we are doing wrong in the first place), please let us know in the comments!