XML parser java not working, why?

Atomic Pineapple

I'm currently working with GWT trying to pull my gmail contacts and display them, my question is why doesn't this piece of code work

public void displayMyItems(String token) {
	    
	  try{
		  System.out.println("display items try");
	  HttpURLConnection connection = (HttpURLConnection)(new URL(ITEMS_FEED)).openConnection() ;
	    // Set properties of the connection
	    
	    connection.setRequestMethod("GET");
	    connection.setRequestProperty("Authorization", "GoogleLogin auth=" + token);
	    connection.setRequestProperty("X-Google-Key", "key=" + "");
	    
	    int responseCode = connection.getResponseCode();
	    InputStream inputStream;
	    if (responseCode == HttpURLConnection.HTTP_OK) {
	      inputStream = connection.getInputStream();
	      System.out.println("ipstream");
	    } else {
	      inputStream = connection.getErrorStream();
	      System.out.println("ipstream error");
	    }
	    System.out.println("error11");
	    
	    System.out.println("here we go " + toString(inputStream));
	    String xml = toString(inputStream);
	    System.out.println("STRINGGFGHFGH");
	    Document xmlDoc = null;
	    System.out.println("doc");
	    xmlDoc = XMLParser.parse(xml);
	    System.out.println("XXXXXXXXXXXXMMMMMMMMMMMMLLLLLLLLLLLDDDDDDDDDOCCCCCCC");
	    Element root = xmlDoc.getDocumentElement();
	    System.out.println("root");
	    XMLParser.removeWhitespace(xmlDoc);
        System.out.println("after white space removal");
        NodeList URLs = (NodeList) root.getChildNodes();
        System.out.println("Urls" + URLs);
        System.out.println("lenght" + URLs.getLength());
        String html = "<ol>";
        for(int i = 0; i < URLs.getLength(); i++){

            Element thisElement = (Element) URLs.item(i);
            System.out.println("Element" + thisElement);
            if (thisElement.getNodeName().equals("email")){

               Element linkElement = (Element) thisElement.getFirstChild();
               //String link = linkElement.getFirstChild().getNodeValue();

               Element titleElement = (Element) linkElement.getNextSibling();
               //String title = titleElement.getFirstChild().getNodeValue();
               Element linkElement2 = (Element) linkElement.getNextSibling();
               System.out.println("WWWWWWWWWWWWWWWWWWWWW" + linkElement2.getNodeValue().toString());
            }
        }

it gets to here xmlDoc = XMLParser.parse(xml); and then stops, String xml seems to just be empty for some reason?

But this piece of code does work

public void onCompletion(String responseText) {
        	System.out.println("Gmail Initiated");
            Document xmlDoc = XMLParser.parse(responseText);
            System.out.println("document got");
            Element root = xmlDoc.getDocumentElement();
            XMLParser.removeWhitespace(xmlDoc);
            System.out.println("after white space removal");
            NodeList URLs = (NodeList) root.getChildNodes();
            System.out.println("Urls" + URLs);
            System.out.println("lenght" + URLs.getLength());
            String html = "<ol>";
            for(int i = 0; i < URLs.getLength(); i++){

                Element thisElement = (Element) URLs.item(i);
                System.out.println("Element" + thisElement);
                if (thisElement.getNodeName().equals("email")){

                   Element linkElement = (Element) thisElement.getFirstChild();
                   //String link = linkElement.getFirstChild().getNodeValue();

                   Element titleElement = (Element) linkElement.getNextSibling();
                   String title = titleElement.getFirstChild().getNodeValue();
                   html += "<li><a href=\"" + title + "\">" + title + "hello"+ "</a></li>";
                   System.out.println("title" + title);
                }
            }

Its really wrecking my heading and google has yielded nothing, I can print the input stream out as a string so it is getting set to a string but when i try to use the Xml Parser on it it just doesn't display anything

Atomic Pineapple

The problem seems to be that toString(inputStream) is returning a null when I try to set it as a variable or use it within the XMLParser.

heres the toString() code

  public String toString(InputStream inputStream) throws IOException {
    String string;
    //System.out.println("Into toString()");
    StringBuilder outputBuilder = new StringBuilder();
    if (inputStream != null) {
      BufferedReader reader =
          new BufferedReader(new InputStreamReader(inputStream));
      while (null != (string = reader.readLine())) {
        outputBuilder.append(string).append('\n');
      }
    }
    return outputBuilder.toString();
  }

but it works when I just print it out, like this : System.out.println("here we go " + toString(inputStream));

So I'm a bit confused as to why its having trouble, can anyone spot the error?

System.out.println("here we go " + toString(inputStream)); - This line works, it prints out the whole xml file
String xml = toString(inputStream); - this doesn't, xml never gets set to anything, its just null
Document xmlDoc = null;
xmlDoc = XMLParser.parse(xml); - so this doesn't work either as xml is null


Why is xml not getting set to the string of input stream?

NotMe

I think the problem is that you're calling toString(inputStream) twice. The first time it reads the input and you print it out. The second time there's nothing left to read.

Try changing

System.out.println("here we go " + toString(inputStream));
String xml = toString(inputStream);

to

String xml = toString(inputStream);
System.out.println("here we go " + xml);

Atomic Pineapple

Thanks NotMe,

I had figured that out and changed it but it still doesn't work, this is the line its having trouble with


Document xmlDoc = XMLParser.parse(xml);

this is the Error I get

[WARN] StandardContext[]Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract void org.developerworks.stocks.client.StocksService.displayMyItems(java.lang.String)' threw an unexpected exception: java.lang.ExceptionInInitializerError
	at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360)
	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164)
<Text Removed>
Caused by: java.lang.ExceptionInInitializerError: null
	at com.google.gwt.xml.client.XMLParser.<clinit>(XMLParser.java:28)
	at org.developerworks.stocks.server.StocksServiceImpl.displayMyItems(StocksServiceImpl.java:359)
Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code!  It cannot be called, for example, from server code.  If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor.
<Text Removed>
	at com.google.gwt.core.client.GWT.create(GWT.java:91)
	at com.google.gwt.xml.client.impl.XMLParserImpl.<clinit>(XMLParserImpl.java:29)
	at com.google.gwt.xml.client.XMLParser.<clinit>(XMLParser.java:28)
	at org.developerworks.stocks.server.StocksServiceImpl.displayMyItems(StocksServiceImpl.java:359)