org.jdom.input.SAXBuilder is a very useful class and is used to convert jdom to dom and vice versa in the example below:
SAXBuilder builder = new SAXBuilder();
org.jdom.Document doc = builder.build( "drainpipe.xml" );
// converts JDOM to W3C DOM
DOMOutputter domOutputter = new DOMOutputter();
// converts W3C DOM to JDOM
DOMBuilder domBuilder = new DOMBuilder();
org.w3c.dom.Document w3cDoc = domOutputter.output( doc );
doc = domBuilder.build( w3cDoc );
org.jdom.Element jdomRoot = doc.getRootElement();
org.w3c.dom.Element domRoot = domOutputter.output( jdomRoot );
jdomRoot = domBuilder.build( domRoot );
System.out.println( jdomRoot );
System.out.println( domRoot );
org.jdom.Attribute jdomAttr = jdomRoot.getAttribute( "type" );
org.w3c.dom.Attr domAttr = domOutputter.output( jdomAttr );
System.out.println( jdomAttr.getValue() );
System.out.println( domAttr.getValue() );