"AWT blocker activation interrupted" Error in JDK 1.7

Java Swing Tutorials - Herong's Tutorial Examples - Version 4.11, by Dr. Herong Yang

Java Swing Tutorials - Herong's Tutorial Examples

∟"AWT blocker activation interrupted" Error in JDK 1.7

This section provides a tutorial example on the condition for the 'AWT blocker activation interrupted' error in JDK 1.7.0 and 1.8.0.

I also tested the same program in JDK 1.7.0 and 1.8.0 and got the following results.

Test 1 - Run FrameThreads.java in a command window and wait:

Active thread = main
Active thread = AWT-Shutdown
Active thread = AWT-Windows
Active thread = AWT-EventQueue-0
Interrupting thread = AWT-Shutdown
Interrupting thread = AWT-Windows
Interrupting thread = AWT-EventQueue-0
AWT blocker activation interrupted:
java.lang.InterruptedException
   at java.lang.Object.wait(Native Method)
   at java.lang.Object.wait(Object.java:503)
   at sun.awt.AWTAutoShutdown.activateBlockerThread(AWTAutoShutdown...
   at sun.awt.AWTAutoShutdown.setToolkitBusy(AWTAutoShutdown.java:2...
   at sun.awt.AWTAutoShutdown.notifyToolkitThreadBusy(AWTAutoShutdo...
   at sun.awt.windows.WToolkit.eventLoop(Native Method)
   at sun.awt.windows.WToolkit.run(WToolkit.java:299)
   at java.lang.Thread.run(Thread.java:744)

The same error, "AWT blocker activation interrupted", showed up first. Then all 3 frame windows were terminated some time later.

Test 2 - Run FrameThreads.java in a command window, hide 3 frames behind another window and wait. I got the same results as test 1.

This tells me that the AWT package in JDK 1.6 is still having some issues if its threads are interrupted. But it behaves consistently now.

Last update: 2014.

Table of Contents

About This Book

Introduction of Java Swing Package

Graphics Environment of the Local System

►JFrame - Main Frame Class

Creating Frames with Sizes and Locations

Closing Frame and Terminating Application

Listing and Interrupting AWT Threads