Performance problem loading XML message on a applet in order to display them on a text scroll view.

Posted on 2007-12-04
Last Modified: 2013-12-29
   I got a problem trying to load XML messages from a URL on an Applet update() method. The applet is used to diaply a text scroll; what happes is when the update method is called (because the current messages are about to passed) is freezing the scrolling effect for a sec. Any ideas how I can handle this?


Carlos M.  
public synchronized void update(Graphics g) {


		int limit = theListOfList.size();

		for (int n = 0;n<limit;n++){ 


			for (Message m : theListOfList.elementAt(n).messages) {






			if ((theListOfList.elementAt(n).messages.lastElement().X + theListOfList.elementAt(n).messages.lastElement().messageSize)- totalLarge == theListOfList.elementAt(n).totalListBufferSize) {


				currentListPoss = nextListPoss;


				loadMessages(theListOfList.elementAt(n).messages.lastElement().X+ theListOfList.elementAt(n).messages.lastElement().messageSize);







This is the loadmessages method:

public synchronized void loadMessages(int X) {


		ListOfMessages currentList = new ListOfMessages();


		try {


			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory


			DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();

			Document doc = docBuilder


			NodeList listOfitems = doc.getElementsByTagName("item");

			for (int s = 1; s < listOfitems.getLength(); s++) {

				Node item = listOfitems.item(s);


			}// end of for loop with s var

		} catch (SAXParseException err) {


		} catch (SAXException e) {

			Exception x = e.getException();

			// System.out.println(e);

			((x == null) ? e : x).printStackTrace();

		} catch (Throwable t) {


			// System.out.println(t);



         int i =0;

		for (String s : receiver) {


			Message currentMsg = new Message(s, X);




			currentList.totalListSize += currentMsg.messageSize;


			X = X + currentMsg.messageSize;




		currentList.totalListBufferSize = (int) (currentList.totalListSize * 0.30);

		theListOfList.add(currentListPoss, currentList);

		if (currentListPoss == messageQueueLimit - 1) {

			nextListPoss = 0;

		} else {

			nextListPoss = currentListPoss + 1;



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Question by:cmercado_miranda
  • 2
LVL 92

Expert Comment

ID: 20408060
you need to handle the loading of xml in a seperate thread.

Author Comment

ID: 20411413
How can I do that, any example of calling a tread on a applet?
LVL 92

Accepted Solution

objects earned 250 total points
ID: 20415858

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