Date: Wed, 15 Apr 1998 17:18:17 -0700
To: ###@###.###
From: "Co H. Hoang" <###@###.###>
Subject: bug?

I am trying to write a test to see how printing works and run into this
NullPointerException. It looks like BoxView.paint() didn't check to
see if clip is null before passing it to intersects(). Is this going to be
fixed and when?

I have attached the 2 files printJFC.java and HtmlPanel.java that I used
for my test. Do 'java printJFC' to run, and type an URL into the text field,
wait for the page to render and click on print.

Thanks,
Co


Exception occurred during event dispatching:
java.lang.NullPointerException:
        at java.awt.Rectangle.intersects(Rectangle.java:383)
        at com.sun.java.swing.text.BoxView.paint(BoxView.java:154)
        at com.sun.java.swing.text.html.HTMLRootView.paint(HTMLRootView.java:106
)
        at com.sun.java.swing.text.DefaultTextUI$RootView.paint(DefaultTextUI.ja
va:741)
        at com.sun.java.swing.text.DefaultTextUI.paintSafely(DefaultTextUI.java:
335)
        at com.sun.java.swing.text.DefaultTextUI$SafePainter.run(DefaultTextUI.j
ava:999)
        at com.sun.java.swing.text.AbstractDocument.render(AbstractDocument.java
:249)
        at com.sun.java.swing.text.DefaultTextUI.paint(DefaultTextUI.java:442)
        at com.sun.java.swing.plaf.ComponentUI.update(ComponentUI.java:47)
        at com.sun.java.swing.JComponent.paintComponent(JComponent.java:374)
        at com.sun.java.swing.JComponent.paint(JComponent.java:579)
        at java.awt.Component.print(Component.java:1377)
        at java.awt.Container.print(Container.java:760)
        at HtmlPanel.print(HtmlPanel.java:39)
        at printJFC.actionPerformed(printJFC.java:74)

----------------------------------------------
// printJFC.java
import com.sun.java.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;

public class printJFC extends JApplet implements ActionListener, KeyListener
{
JFrame frame = new JFrame("test");
JButton button = new JButton("print");
JTextField textField = new JTextField();
HtmlPanel htmlPanel = new HtmlPanel();

public printJFC()
{
init();
}

public void init()
{
frame.getContentPane().setLayout(
new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS));
frame.getContentPane().add(textField);
frame.getContentPane().add(htmlPanel);
frame.getContentPane().add(button);
button.addActionListener(this);
textField.addKeyListener(this);
frame.setSize(800, 600);
frame.setVisible(true);

}

public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) {}

public void keyReleased(KeyEvent event)
{
if (KeyEvent.VK_ENTER == event.getKeyCode())
{
try
{
htmlPanel.gotoURL(new URL(textField.getText()));
}
catch (MalformedURLException e)
{
System.out.println("MalformedURLException caught in keyReleased()!");
}
}
}

public void actionPerformed(ActionEvent event)
{
if (event.getSource() == button)
{
PrintJob pj = frame.getToolkit().getPrintJob(frame, "currentURL", null);
if (pj != null)
{
Graphics g = pj.getGraphics();

htmlPanel.print(g);
pj.end();
}
}
}

public static void main(String args[])
{
new printJFC();
}

}

--------------------------------------------
//HtmlPanel.java
import com.sun.java.swing.*;
import com.sun.java.swing.border.*;
import com.sun.java.swing.event.*;
import com.sun.java.swing.text.*;
import com.sun.java.accessibility.*;
import java.awt.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
public class HtmlPanel extends JPanel implements HyperlinkListener
{
JEditorPane html;
public HtmlPanel()
{
setBorder(new EmptyBorder(10,10,10,10));
setLayout(new BorderLayout());
getAccessibleContext().setAccessibleName("HTML panel");
getAccessibleContext().setAccessibleDescription(
"A panel for viewing HTML documents, and following their links");
html = new JEditorPane();
html.setEditable(false);
html.addHyperlinkListener(this);

JScrollPane scroller = new JScrollPane();
scroller.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));

JViewport vp = scroller.getViewport();
vp.add(html);
vp.setBackingStoreEnabled(true);
add(scroller, BorderLayout.CENTER);
}

public void print(Graphics g)
{
html.print(g);
}

public void gotoURL(URL url)
{
try
{
html.setPage(url);
}
catch (IOException ioe)
{
System.out.println("IOException caught in gotoURL(), url = " + url);
}
}

public void hyperlinkUpdate(HyperlinkEvent e)
{
if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
linkActivated(e.getURL());
}
protected void linkActivated(URL u)
{
Cursor c = html.getCursor();
Cursor waitCursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR);
html.setCursor(waitCursor);
SwingUtilities.invokeLater(new PageLoader(u, c));
}
class PageLoader implements Runnable
{
URL url;
Cursor cursor;

PageLoader(URL u, Cursor c)
{
url = u;
cursor = c;
}
public void run()
{
if (url == null)
{
// restore the original cursor
html.setCursor(cursor);
// PENDING(prinz) remove this hack when
// automatic validation is activated.
Container parent = html.getParent();
parent.repaint();
}
else
{
Document doc = html.getDocument();
try
{
html.setPage(url);
}
catch (IOException ioe)
{
html.setDocument(doc);
getToolkit().beep();
}
finally
{
// schedule the cursor to revert after
// the paint has happended.
url = null;
SwingUtilities.invokeLater(this);
}
}
} // void run()
} // class PageLoader
}


=========================================================
Co Hoang Extensity, Inc.
mailto:###@###.### 2200 Powell St., Ste. 400
http://www.extensity.com Emeryville, CA 94608
(510)594-5706 Fax: (510)596-2676