Name: gm110360 Date: 04/26/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :


ADDITIONAL OPERATING SYSTEMS :
Service Pack 2


EXTRA RELEVANT SYSTEM CONFIGURATION :
IE 6.0

A DESCRIPTION OF THE PROBLEM :
When attempting to retrieve child nodes from an
HTMLDocument, a null NodeList is returned.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use the following code in an applet:

DOMService s = DOMService.getService(this);
s.invokeAndWait(new DOMAction() {
  public Object run(DOMAccessor a) {
    HTMLDocument doc = (HTMLDocument)a.getDocument(self);
    NodeList l = doc.getChildNodes();
    if (l == null)
        System.err.println("l is null");
    return l;
  }
});


EXPECTED VERSUS ACTUAL BEHAVIOR :
"l is null" is viewable in the console.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
at org.Aaern.acp.TestApplet$1.run(TestApplet.java:33)
at sun.plugin.dom.DOMService.invokeAndWait(Unknown Source)
at org.Aaern.acp.TestApplet.start(TestApplet.java:23)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package org.Aaern.acp;

import javax.swing.JApplet;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;

import org.w3c.dom.html.*;
import org.w3c.dom.*;
import com.sun.java.browser.dom.*;

public class TestApplet extends JApplet {
    JTextArea text;
    TestApplet self = this;

    public void start() {
        text = new JTextArea();
        getContentPane().add(new JScrollPane(text));
        showStatus("Starting...");
        
        try {
            DOMService s = DOMService.getService(this);

            s.invokeAndWait(new DOMAction() {
                public Object run(DOMAccessor a) {
HTMLDocument doc = (HTMLDocument)
a.getDocument(self);
                    NodeList l = doc.getChildNodes();
                    if (l == null) {
                        System.err.println("l is null");
                        text.append("l is null");
                    }

                    Node t;
                    for (int i=0,max=l.getLength();i<max;i++)
                        t = l.item(i);

                    return l;
                }
            });
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
}
---------- END SOURCE ----------
(Review ID: 145897)
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