You have now created the networking and XML generation code for the application. The CrnpClient constructor calls a setupXmlProcessing method. This method creates a DocumentBuilderFactory object and sets various parsing properties on that object. The JAXP documentation describes this method in more detail. See http://java.sun.com/webservices/jaxp/.
Create the Java code that implements the preceding logic.
private void setupXmlProcessing() throws Exception { dbf = DocumentBuilderFactory.newInstance(); // We don't need to bother validating dbf.setValidating(false); dbf.setExpandEntityReferences(false); // We want to ignore comments and whitespace dbf.setIgnoringComments(true); dbf.setIgnoringElementContentWhitespace(true); // Coalesce CDATA sections into TEXT nodes. dbf.setCoalescing(true); }