Error in WebBrowser

Question

Hi all,
I'm currently working on a webBrowser with java since i've come to jdk 1.5, a bug triggered.
IIt only happens on certain url like yahoo.fr for example.
The problem is that tje error doesn't refer to my code so i don't know where to search.
Here's the error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
at javax.swing.text.html.CSS$FontSize.toStyleConstants(Unknown Source)
at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(Unknown Source)
at javax.swing.text.StyleConstants.getFontSize(Unknown Source)
at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
at javax.swing.text.html.CSS.getFontSize(Unknown Source)
at javax.swing.text.html.CSS.getFont(Unknown Source)
at javax.swing.text.html.StyleSheet.getFont(Unknown Source)
at javax.swing.text.DefaultStyledDocument.getFont(Unknown Source)
at javax.swing.text.LabelView.setPropertiesFromAttributes(Unknown Source)
at javax.swing.text.html.InlineView.setPropertiesFromAttributes(Unknown Source)
at javax.swing.text.LabelView.sync(Unknown Source)
at javax.swing.text.LabelView.getFont(Unknown Source)
at javax.swing.text.GlyphPainter1.sync(Unknown Source)
at javax.swing.text.GlyphPainter1.getSpan(Unknown Source)
at javax.swing.text.GlyphView.getPreferredSpan(Unknown Source)
at javax.swing.text.FlowView$LogicalView.getPreferredSpan(Unknown Source)
at javax.swing.text.FlowView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.ParagraphView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.ParagraphView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.TableView.checkMultiColumnCell(Unknown Source)
at javax.swing.text.html.TableView.calculateColumnRequirements(Unknown Source)
at javax.swing.text.html.TableView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.TableView.checkSingleColumnCell(Unknown Source)
at javax.swing.text.html.TableView.calculateColumnRequirements(Unknown Source)
at javax.swing.text.html.TableView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.TableView.checkSingleColumnCell(Unknown Source)
at javax.swing.text.html.TableView.calculateColumnRequirements(Unknown Source)
at javax.swing.text.html.TableView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.setSpanOnAxis(Unknown Source)
at javax.swing.text.BoxView.layout(Unknown Source)
at javax.swing.text.BoxView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paintSafely(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JViewport.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown Source)
at javax.swing.JComponent.paintDoubleBuffered(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Even if I use a JTextPane for displaying documents or ourl, i got the same.
Does someone know why???
And by the way, is there any way to make scripts work except of Rhino???

Answer 1

I've the same problem.
At first I try to write a simple HTML Viewer aka browser.
I use a JEditorPane to show the content.
The appletviewer shows no error in the message pane.
But my 'browser' behaves different (why that ???) - in the Java Console I get a lot of
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
     at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
     at javax.swing.text.html.CSS$FontSize.toStyleConstants(Unknown Source)
     at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(Unknown Source)
     at javax.swing.text.StyleConstants.getFontSize(Unknown Source)
     at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
     at javax.swing.text.html.CSS.getFontSize(Unknown Source)
     at javax.swing.text.html.CSS.getFont(Unknown Source)
     at javax.swing.text.html.StyleSheet.getFont(Unknown Source)
     at javax.swing.text.DefaultStyledDocument.getFont(Unknown Source)
     at javax.swing.text.LabelView.setPropertiesFromAttributes(Unknown Source)
     at javax.swing.text.html.InlineView.setPropertiesFromAttributes(Unknown Source)
     at javax.swing.text.LabelView.sync(Unknown Source)
     at javax.swing.text.LabelView.getFont(Unknown Source)
     at javax.swing.text.GlyphPainter1.sync(Unknown Source)
-- Nick
My coding is as follows:
--- Viewer.html --------------------------
<html>
<head>
<title>
Internet sitechecker
</title>
</head>
<body>
"sitechecker" will appear below in a Java enabled browser.<br>
<applet
codebase = "."
code = "site.Viewer.class"
name = "TestApplet"
width = "800"
height = "600"
hspace = "25"
vspace = "25"
align = "middle"
>
</applet>
</body>
</html>
--- Viewer.java------------------------------
package site;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Viewer extends JApplet {
// static, damit die Klasse website die Objekte verwenden kann
// und ich sie nicht dem website-Konstruktor uebergeben muss
static JEditorPane editorPane = new JEditorPane("text/html","");
static String site;
static JLabel labelElapsedTime = new JLabel();
JPanel panelViewerMain = new JPanel();
BorderLayout borderLayout1 = new BorderLayout();
JScrollPane scrollPane = new JScrollPane();
JPanel panel1 = new JPanel();
JTextField urlTextfield = new JTextField(20);
JLabel urlLabel = new JLabel();
JPanel panel2 = new JPanel();
BorderLayout borderLayout2 = new BorderLayout();
JPanel panel3 = new JPanel();
JPanel Panel4 = new JPanel();
JButton reloadButton = new JButton();
JButton stopButton = new JButton();
JButton startButton = new JButton();
JLabel labelTimer = new JLabel();
public Viewer() {
public void init() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
panelViewerMain.setLayout(borderLayout1);
editorPane.setMinimumSize (new Dimension (400, 200));
editorPane.setPreferredSize (new Dimension (400, 300));
editorPane.setText("html viewer");
urlTextfield.setText("http://java.sun.com/j2se/1.5.0/docs/api/");
urlLabel.setText("URL");
panel2.setLayout(borderLayout2);
reloadButton.setText("reload page");
stopButton.setText("stop loading");
startButton.setText("load page");
startButton.addActionListener(new Viewer_startButton_actionAdapter(this));
labelTimer.setText("Antwortzeit:");
scrollPane.setMinimumSize (new Dimension (18, 200));
scrollPane.setPreferredSize (new Dimension (3, 200));
this.getContentPane().add(panelViewerMain, null);
panelViewerMain.add(scrollPane, BorderLayout.CENTER);
scrollPane.getViewport ().add (editorPane, null);
panelViewerMain.add(panel1, BorderLayout.NORTH);
panel1.add(urlLabel, null);
panel1.add(urlTextfield, null);
panelViewerMain.add(panel2, BorderLayout.SOUTH);
panel2.add(panel3, BorderLayout.NORTH);
panel3.add(startButton, null);
panel3.add(stopButton, null);
panel3.add(reloadButton, null);
panel2.add(Panel4, BorderLayout.SOUTH);
Panel4.add(labelTimer, null);
Panel4.add(labelElapsedTime, null);
void startButton_actionPerformed(ActionEvent e) throws IOException {
site = urlTextfield.getText();
// starting a thread
Runnable ot = new website();
Thread th = new Thread(ot);
th.start();
class Viewer_startButton_actionAdapter implements java.awt.event.ActionListener {
Viewer adaptee;
Viewer_startButton_actionAdapter(Viewer adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
try {
adaptee.startButton_actionPerformed (e);
catch (IOException ex) {
----- website.java ----------
package site;
import java.net.URL;
import java.io.IOException;
import java.util.Calendar;
public class website extends Viewer implements Runnable {
public website () {}
public void run () {
try {
editorPane.setText("Seite wird geholt...");
long startTime = System.currentTimeMillis();
URL url = new URL (site);
editorPane.setEditable (false);
editorPane.setPage (url);
long estimatedTime = System.currentTimeMillis() - startTime;
labelElapsedTime.setText("" estimatedTime " ms");
catch (IOException io) {
editorPane.setText ("IO Exception: " + io);
}