SAXBuilder builder =  new  SAXBuilder();
Document docJDOM = builder.build("c:\\XMLLink\\test.xml");   

InputStream stream =  new  FileInputStream( new  File("c:\\XMLLink\\test.xml"));
InputStreamReader sreader =  new  InputStreamReader(stream, "UTF8");         
SAXBuilder builder =  new  SAXBuilder();
Document docJDOM = builder.build(sreader);    

org.jdom.input.JDOMParseException: Error on line  1 : Document root element is missing.

<?xml version="1.0" encoding="UTF-8"?>

<data>

	<data1> 1 </data1>

	<data2> 2 </data2>

</data>

System.out.println( new  OutputStreamWriter(ostream, "UTF-8").getEncoding());
System.out.println( new  OutputStreamWriter(ostream, "UTF8").getEncoding());

UTF8
UTF8