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JDK-4699828 : Browser Crashes when JList used Table's CellEditor&Renderer
  • Type: Bug
  • Component: client-libs
  • Sub-Component: javax.swing
  • Affected Version: 1.4.0
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_8
  • CPU: x86
  • Submitted: 2002-06-10
  • Updated: 2003-04-12
  • Resolved: 2002-08-12
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availabitlity Release.

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Other
1.4.2 mantisFixed
Description

Name: gm110360			Date: 06/10/2002


FULL PRODUCT VERSION :
java version "1.4.0_00"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_00-b05)
Java HotSpot(TM) Client VM (build 1.4.0_00-b05, mixed mode)


FULL OPERATING SYSTEM VERSION :
SunOS unknown 5.8 Generic_108528-06 sun4u sparc
SUNW,Sun-Blade-10

A DESCRIPTION OF THE PROBLEM :
Netscape 6 w/ Java Plugin 1.3.1 and Netscape 6.2.2 w/ Java
Plugin 1.4 crash when JList is used as CellEditor &
CellRenderer in a JTable. This seems to occur only on
Solaris but was successfully reproduced on multiple machines
and Sun Solaris flavors.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.Copy code below and compile.

2. Run in Netscape 6+ (as an applet), a simple table will be
displayed. Select the item in the JList (CRASH BABY).

3. Now try to refresh the browser (Look at it go!)

EXPECTED VERSUS ACTUAL BEHAVIOR :
Obviously, a browser crash is unexpected at this phase.



ERROR MESSAGES/STACK TRACES THAT OCCUR :
===== plugin.trace =====
java.lang.NullPointerException
	at javax.swing.JComponent.deregisterNextFocusableComponent(JComponent.java:992)
	at javax.swing.JComponent.removeNotify(JComponent.java:4293)
	at java.awt.Container.removeNotify(Container.java:2023)
	at javax.swing.JComponent.removeNotify(JComponent.java:4286)
	at javax.swing.JTable.removeNotify(JTable.java:477)
	at java.awt.Container.removeNotify(Container.java:2023)
	at javax.swing.JComponent.removeNotify(JComponent.java:4286)
	at java.awt.Container.removeNotify(Container.java:2023)
	at javax.swing.JComponent.removeNotify(JComponent.java:4286)
	at java.awt.Container.removeNotify(Container.java:2023)
	at javax.swing.JComponent.removeNotify(JComponent.java:4286)
	at javax.swing.JRootPane.removeNotify(JRootPane.java:673)
	at java.awt.Container.removeNotify(Container.java:2023)
	at java.awt.Container.removeNotify(Container.java:2023)
	at sun.plugin.viewer.MNetscapePluginObject.setWindow(MNetscapePluginObject.java:260)
	at sun.plugin.navig.motif.Plugin.doit(Plugin.java:263)
	at sun.plugin.navig.motif.Plugin.start(Plugin.java:96)

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
===== TestApplet.java =====
package com.e4e.uitools.calendar;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TestApplet extends JApplet {
public void init() {
    JTable table = new JTable();
    table.setDefaultRenderer(Object.class, new ListRenderer());
    table.setDefaultEditor(Object.class, new ListRenderer());
    table.setModel(new DefaultTableModel(3,3));
    this.getContentPane().add(table);
}
}

===== ListRenderer.java =====package com.e4e.uitools.calendar;

import java.awt.Component;
import java.util.EventObject;

import javax.swing.*;
import javax.swing.event.CellEditorListener;
import javax.swing.table.*;

public class ListRenderer extends JList implements TableCellEditor,
TableCellRenderer {

    /**
     * Constructor for ListRenderer.
     */
    public ListRenderer() {
        super();
        DefaultListModel model = new DefaultListModel();
        model.addElement("CRASH BABY);
        this.setModel(model);
    }

    public Component getTableCellEditorComponent(
        JTable table,
        Object value,
        boolean isSelected,
        int row,
        int column) {
        return this;
    }

    public Component getTableCellRendererComponent(
        JTable table,
        Object value,
        boolean isSelected,
        boolean hasFocus,
        int row,
        int column) {
        return this;
    }

    public void addCellEditorListener(CellEditorListener l) {
    }

    public void cancelCellEditing() {
    }

    public Object getCellEditorValue() {
        return null;
    }

    public boolean isCellEditable(EventObject anEvent) {
        return true;
    }

    public void removeCellEditorListener(CellEditorListener l) {
    }


    public boolean shouldSelectCell(EventObject anEvent) {
        return false;
    }

    public boolean stopCellEditing() {
        return false;
    }


}


---------- END SOURCE ----------
(Review ID: 153408) 
======================================================================

Comments
CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: mantis mantis-b02 FIXED IN: mantis mantis-b02 INTEGRATED IN: mantis mantis-b02 tiger-b03
2004-08-24

EVALUATION ... Name: apR10133 Date: 06/14/2002 This bug can be reproduced with a sufficiently more simple way. It is enough to create JTable and start the editing of any table's cell. After the "reload" you will get the same exception. The cause of this bug is that ext/plugin/java/src/sun/plugin/viewer/WNetscapePluginObject.java calls removeAll() on the embedded frame for the plugin and then it calls removeNotify() on panel for hosting the applet at the setWindow() method. The JComponent's removeNotify() calls the deregisterNextFocusableComponent() where we try to get the focus cycle root ancestor and it's focus traversal policy. But as the applet panel is already removed from the embedded frame the focus cycle root is null and hence we get the NPE. So we just need to check if it null. ###@###.### ======================================================================
2004-08-24

SUGGESTED FIX Name: apR10133 Date: 06/14/2002 ------- JComponent.java ------- *** /tmp/sccs.LGaG.W Fri Jun 14 18:45:23 2002 --- JComponent.java Fri Jun 14 18:38:46 2002 *************** *** 993,998 **** --- 993,1001 ---- Container nearestRoot = (isFocusCycleRoot()) ? this : getFocusCycleRootAncestor(); + if (nearestRoot == null) { + return; + } FocusTraversalPolicy policy = nearestRoot.getFocusTraversalPolicy(); if (policy instanceof LegacyGlueFocusTraversalPolicy) { ((LegacyGlueFocusTraversalPolicy)policy). ###@###.### ======================================================================
2004-08-24