On both Solaris 8 and Windows 2000 with JDK 1.4 beta 3, the following code results in a NullPointerException in javax.swing.text.FlowView.layout. This code works fine on both platforms with JDK 1.3.1.


Code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;

public class Frame1 extends JFrame
{
    JPanel contentPane;
    BorderLayout borderLayout1 = new BorderLayout();
    JScrollPane jScrollPane1 = new JScrollPane();
     
     /**Construct the frame*/
    public Frame1()
    {
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
        try
        {
            jbInit();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
     
    /**Component initialization*/
    private void jbInit() throws Exception
    {
        contentPane = (JPanel) this.getContentPane();
        this.setSize(new Dimension(600, 400));

        /* Create the editor kit and document */
        JTextPane jTextPane1 = new JTextPane();
        jTextPane1.setContentType("text/html");
        HTMLEditorKit editorKit =
            (HTMLEditorKit)jTextPane1.getEditorKit();

        /* Set up the text pane */
        HTMLDocument doc = (HTMLDocument) jTextPane1.getStyledDocument();
        final StyleSheet style = doc.getStyleSheet();
        
        // Commenting out this line prevents the NullPointerException
        style.addRule(
            "td { color : #00FF00; font-family: Arial; font-size: 18pt; }");

        HTMLDocument newdoc = new HTMLDocument(style);
        newdoc.setParser(new
        javax.swing.text.html.parser.ParserDelegator());

        String line =
                "<tr><td colspan=3></td></tr>"
                + "<tr><td colspan=3>Oct 23, 2001</td></tr>"
                + "<tr>"
                + "<td><nobr>4:21</nobr></td>"
                + "<td>SOMEUSER</td>"
                + "<tr><td><nobr>4:21</nobr></td><td>SOMEUSER</td><td>"
                + "some dummy words some dummy words some dummy words "
                + "</td></tr>";

        editorKit.insertHTML(newdoc,
                             0,
                             line,
                             0,
                             0,
                             HTML.Tag.TABLE);
        contentPane.add(jScrollPane1, BorderLayout.CENTER);
        jTextPane1.setStyledDocument(newdoc);
        jScrollPane1.getViewport().add(jTextPane1, null);
    }
  
    /**Overridden so we can exit when window is closed*/
    protected void processWindowEvent(WindowEvent e)
    {
        super.processWindowEvent(e);
        if (e.getID() == WindowEvent.WINDOW_CLOSING)
        {
            System.exit(0);
        }
    }
    
    public static void main(String[] args)
    {
        JFrame frame = new Frame1();
        frame.show();
    }
}


Error Message:

java.lang.NullPointerException
        at javax.swing.text.FlowView.layout(FlowView.java:195)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:351)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:333)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:346)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:319)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:351)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:333)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:346)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:319)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:351)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:333)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.FlowView.layout(FlowView.java:199)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:351)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:333)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.text.BoxView.updateChildSizes(BoxView.java:351)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:333)
        at javax.swing.text.BoxView.layout(BoxView.java:685)
        at javax.swing.text.BoxView.setSize(BoxView.java:382)
        at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1536)
        at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(BasicTextUI.java:733)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1265)
        at javax.swing.JEditorPane.getPreferredSize(JEditorPane.java:1204)
        at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:770)
        at java.awt.Container.layout(Container.java:838)
        at java.awt.Container.doLayout(Container.java:828)
        at java.awt.Container.validateTree(Container.java:906)
        at java.awt.Container.validateTree(Container.java:913)
        at java.awt.Container.validateTree(Container.java:913)
        at java.awt.Container.validateTree(Container.java:913)
        at java.awt.Container.validateTree(Container.java:913)
        at java.awt.Container.validate(Container.java:881)
        at java.awt.Window.dispatchEventImpl(Window.java:1566)
        at java.awt.Component.dispatchEvent(Component.java:3368)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:141)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:133)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:101)