Question

I am using the following code for parsing an XML file. But I don’t get any response. Can anyone help?

I am also getting a warning when I open a connection:

“Warning!: Invocation of questionable method: java.lang.String.() found”`?

public static void main(String arg[]){
    XML_Parsing_Sample application = new XML_Parsing_Sample();
    //create a new instance of the application
    //and start the application on the event thread
    application.enterEventDispatcher();
}

public XML_Parsing_Sample() {
    _screen.setTitle("XML Parsing");//setting title
    _screen.add(new RichTextField("Requesting....."));
    _screen.add(new SeparatorField());
    pushScreen(_screen); // creating a screen
    //creating a connection thread to run in the background
    _connectionthread = new Connection();
    _connectionthread.start();//starting the thread operation
}

public void updateField(String node, String element){
    //receiving the parsed node and its value from the thread
    //and updating it here
    //so it can be displayed on the screen
    String title="Title";
    _screen.add(new RichTextField(node+" : "+element));

    if(node.equals(title)){
        _screen.add(new SeparatorField());
    }
}

private class Connection extends Thread{
    public Connection(){
        super();
    }

    public void run(){
        // define variables later used for parsing
        Document doc;
        StreamConnection conn;

        try{
            //providing the location of the XML file,
            //your address might be different
            conn=(StreamConnection)Connector.open
              ("http://www.w3schools.com/xml/note.xml",Connector.READ);
            //next few lines creates variables to open a
            //stream, parse it, collect XML data and
            //extract the data which is required.
            //In this case they are elements,
            //node and the values of an element
            DocumentBuilderFactory docBuilderFactory
              = DocumentBuilderFactory. newInstance(); 
            DocumentBuilder docBuilder
              = docBuilderFactory.newDocumentBuilder();
            docBuilder.isValidating();
            doc = docBuilder.parse(conn.openInputStream());
            doc.getDocumentElement ().normalize ();
            NodeList list=doc.getElementsByTagName("*");
            _node=new String();
            _element = new String();
            //this "for" loop is used to parse through the
            //XML document and extract all elements and their
            //value, so they can be displayed on the device

            for (int i=0;i<list.getLength();i++){
                Node value=list.item(i).
                  getChildNodes().item(0);
                _node=list.item(i).getNodeName();
                _element=value.getNodeValue();
                updateField(_node,_element);
            }//end for
        }//end try
        //will catch any exception thrown by the XML parser
        catch (Exception e){
            System.out.println(e.toString());
        }
    }//end connection function
}// end connection class

Answer 1

You are probably timing out.
Try opening the connection as HTTP connection instead, and use the new ConnectionFactory class to get rid of annoying suffixes.