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Bug ID: 6665129 Intermittent hangs due to shutdown of GrayBoxPainter
6665129 : Intermittent hangs due to shutdown of GrayBoxPainter

Details
Type:
Bug
Submit Date:
2008-02-20
Status:
Closed
Updated Date:
2010-09-08
Project Name:
JDK
Resolved Date:
2008-03-19
Component:
deploy
OS:
generic
Sub-Component:
plugin
CPU:
generic
Priority:
P2
Resolution:
Fixed
Affected Versions:
6u10
Fixed Versions:
6u10

Related Reports
Backport:
JDK-2196953 - Intermittent hangs due to shutdown of GrayBoxPainter
Backport:
JDK-2195843 - Intermittent hangs due to shutdown of GrayBoxPainter

Sub Tasks

Description
Code in the GrayBoxPainter class which doesn't obey the AWT threading model is causing some applets to hang. The following (implicit, not explicit) deadlock, excerpted from the attached thread dump, is quite easily reproduced by running the SwingSet2 applet from http://java.sun.com/products/plugin/1.5.0/demos/plugin/jfc/SwingSet2/SwingSet2.html with the Java Console enabled.

In order to fix this, GrayBoxPainter.suspendPainting() and likely any other of the GrayBoxPainter's methods must be brought in line with the AWT threading model.

"Thread-24" prio=4 tid=0x03230c00 nid=0x358 waiting for monitor entry [0x0ec1f000..0x0ec1fc94]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.awt.Component.setFont(Unknown Source)
	- waiting to lock <0x22eb90c8> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.setFont(Unknown Source)
	at javax.swing.JComponent.setFont(Unknown Source)
	at javax.swing.LookAndFeel.installColorsAndFont(Unknown Source)
	at javax.swing.plaf.basic.BasicPanelUI.installDefaults(Unknown Source)
	at javax.swing.plaf.basic.BasicPanelUI.installUI(Unknown Source)
	at javax.swing.JComponent.setUI(Unknown Source)
	at javax.swing.JPanel.setUI(Unknown Source)
	at javax.swing.JPanel.updateUI(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at javax.swing.JPanel.<init>(Unknown Source)
	at javax.swing.JRootPane.createGlassPane(Unknown Source)
	at javax.swing.JRootPane.<init>(Unknown Source)
	at javax.swing.JApplet.createRootPane(Unknown Source)
	at javax.swing.JApplet.<init>(Unknown Source)
	at DemoModule.<init>(DemoModule.java:107)
	at ButtonDemo.<init>(ButtonDemo.java:108)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at SwingSet2.loadDemo(SwingSet2.java:822)
	at SwingSet2.loadDemos(SwingSet2.java:95)
	at SwingSet2$DemoLoadThread.run(SwingSet2.java:1410)

"thread applet-SwingSet2Applet-4" prio=4 tid=0x02a8b400 nid=0x4b8 in Object.wait() [0x0daff000..0x0daffa94]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.Object.wait(Object.java:485)
	at javax.swing.text.AbstractDocument.readLock(Unknown Source)
	- locked <0x244d6908> (a javax.swing.text.PlainDocument)
	at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(Unknown Source)
	at javax.swing.JComponent.getPreferredSize(Unknown Source)
	at javax.swing.JTextField.getPreferredSize(Unknown Source)
	at java.awt.BorderLayout.layoutContainer(Unknown Source)
	- locked <0x22eb90c8> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.layout(Unknown Source)
	at java.awt.Container.doLayout(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validate(Unknown Source)
	- locked <0x22eb90c8> (a java.awt.Component$AWTTreeLock)
	at sun.plugin.util.GrayBoxPainter.suspendPainting(Unknown Source)
	- locked <0x244955d8> (a sun.plugin.util.GrayBoxPainter)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

"AWT-EventQueue-5" prio=4 tid=0x032af800 nid=0x360 waiting for monitor entry [0x0e5ff000..0x0e5ffb14]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.awt.Component.invalidate(Unknown Source)
	- waiting to lock <0x22eb90c8> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.invalidate(Unknown Source)
	at javax.swing.JComponent.revalidate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$RootView.preferenceChanged(Unknown Source)
	at javax.swing.text.View.preferenceChanged(Unknown Source)
	at javax.swing.text.PlainView.updateDamage(Unknown Source)
	at javax.swing.text.PlainView.insertUpdate(Unknown Source)
	at javax.swing.text.FieldView.insertUpdate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(Unknown Source)
	at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)
	at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source)
	at javax.swing.text.AbstractDocument.insertString(Unknown Source)
	at javax.swing.text.PlainDocument.insertString(Unknown Source)
	at javax.swing.text.AbstractDocument.replace(Unknown Source)
	at javax.swing.text.JTextComponent.setText(Unknown Source)
	at SwingSet2$5.run(SwingSet2.java:937)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(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)

"AWT-EventQueue-1" prio=6 tid=0x0312a800 nid=0x2c8 waiting for monitor entry [0x035cf000..0x035cfb94]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.awt.Component.invalidate(Unknown Source)
	- waiting to lock <0x22eb90c8> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.invalidate(Unknown Source)
	at javax.swing.JComponent.revalidate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$RootView.preferenceChanged(Unknown Source)
	at javax.swing.text.View.preferenceChanged(Unknown Source)
	at javax.swing.text.PlainView.updateDamage(Unknown Source)
	at javax.swing.text.PlainView.insertUpdate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(Unknown Source)
	at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(Unknown Source)
	at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)
	at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source)
	at javax.swing.text.AbstractDocument.insertString(Unknown Source)
	at javax.swing.text.PlainDocument.insertString(Unknown Source)
	at javax.swing.JTextArea.append(Unknown Source)
	at com.sun.deploy.util.ConsoleWindow$25.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(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)

Comments
SUGGESTED FIX

http://sa.sfbay.sun.com/projects/deployment_data/6u10/6665129.0
testcase: http://j2se.east.sun.com/deployment/www/tests/1.6.0_10/6665129/
2008-02-20 
EVALUATION

Worked around deadlocks caused by thread-unsafety of GrayBoxPainter by
performing operations requiring AWT tree lock and potentially causing
unbounded amounts of user code to run to be done on the Event Dispatch
Thread.

Note that another variant of this fix was attempted which moved more
work on to the Event Dispatch Thread synchronously (using
EventQueue.invokeAndWait()), but this caused significant breakage.
Therefore this smaller and more targeted fix was chosen.
2008-02-20


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