Run the test, and choose Other, Multithreaded Stress Test

I put a few extra printlns in to show what is happening. My modifications
are below, and the thread dump is below that:

sccs diffs -C RobotTest.java

------- RobotTest.java -------
*** /tmp/sccs.APaOF6 Sun Apr 27 21:13:41 2003
--- RobotTest.java Sun Apr 27 21:05:11 2003
***************
*** 375,386 ****
                threads[nthread].start();
            }
  
! for ( int nthread = 0; nthread < threads.length; nthread++ ) {
! try {
! threads[nthread].join();
! } catch (InterruptedException ie) {
! }
! }
  
            new MessageDialog(RobotFrame.this, "Stress Test", "Test completed.");
        }
--- 375,388 ----
                threads[nthread].start();
            }
  
! for ( int nthread = 0; nthread < threads.length; nthread++ ) {
! try {
! System.out.println("Joining Thread");
! threads[nthread].join();
! } catch (InterruptedException ie) {
! System.out.println("Caught IE from joining");
! }
! }
  
            new MessageDialog(RobotFrame.this, "Stress Test", "Test completed.");
        }
***************
*** 396,408 ****
        }
  
        public void run() {
            for( int iteration = 0; iteration < maxIters; iteration++) {
                Random rand = new Random();
                try {
                    Robot robot = new Robot();
                } catch(AWTException ae) {
- new MessageDialog(RobotFrame.this, "Robot", ae.getMessage());
                    ae.printStackTrace();
                }
                Rectangle captureRect = new Rectangle();
                Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
--- 398,412 ----
        }
  
        public void run() {
+ System.out.println("Starting Thread #" + tnum);
            for( int iteration = 0; iteration < maxIters; iteration++) {
                Random rand = new Random();
                try {
                    Robot robot = new Robot();
+ System.out.println(" Thread #" + tnum +" created Robot iteration #"+iteration);
                } catch(AWTException ae) {
                    ae.printStackTrace();
+ new MessageDialog(RobotFrame.this, "Robot", ae.getMessage());
                }
                Rectangle captureRect = new Rectangle();
                Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
***************
*** 412,419 ****
                captureRect.width = Math.abs(rand.nextInt() % size.width);
                captureRect.height = Math.abs(rand.nextInt() % size.height);
                robot.createScreenCapture(captureRect);
                robot.mouseMove(captureRect.x, captureRect.y);
! System.out.println("Thread #" + tnum +" iteration #"+iteration);
            }
        }
      }
--- 416,424 ----
                captureRect.width = Math.abs(rand.nextInt() % size.width);
                captureRect.height = Math.abs(rand.nextInt() % size.height);
                robot.createScreenCapture(captureRect);
+ System.out.println(" Thread #" + tnum +" captured iteration #"+iteration);
                robot.mouseMove(captureRect.x, captureRect.y);
! System.out.println("Thread #" + tnum +" finishing iteration #"+iteration);
            }
        }
      }
echawkes@gradgrind:/net/jano/export/disk26/awt/echawkes/jdk15-3/test/java/awt/Robot/RobotTest( 180 )%


echawkes@gradgrind:/net/jano/export/disk26/awt/echawkes/jdk15-3/test/java/awt/Robot/RobotTest( 178 )% /import/java/jdk1.5/solaris-sparc/bin/java RobotTest
Joining Thread
Starting Thread #0
Starting Thread #1
Starting Thread #2
Starting Thread #3
Starting Thread #4
Starting Thread #5
Starting Thread #6
Starting Thread #7
Starting Thread #8
Starting Thread #9
Starting Thread #10
Starting Thread #11
Starting Thread #12
Starting Thread #13
Starting Thread #14
Starting Thread #15
Starting Thread #16
Starting Thread #17
Starting Thread #18
Starting Thread #19
  Thread #0 created Robot iteration #0
  Thread #1 created Robot iteration #0
  Thread #2 created Robot iteration #0
  Thread #3 created Robot iteration #0
  Thread #4 created Robot iteration #0
  Thread #5 created Robot iteration #0
  Thread #6 created Robot iteration #0
  Thread #7 created Robot iteration #0
  Thread #8 created Robot iteration #0
  Thread #9 created Robot iteration #0
  Thread #10 created Robot iteration #0
  Thread #11 created Robot iteration #0
  Thread #12 created Robot iteration #0
  Thread #13 created Robot iteration #0
  Thread #14 created Robot iteration #0
  Thread #15 created Robot iteration #0
  Thread #16 created Robot iteration #0
  Thread #17 created Robot iteration #0
  Thread #18 created Robot iteration #0
  Thread #19 created Robot iteration #0
  Thread #0 captured iteration #0
  Thread #1 captured iteration #0
  Thread #2 captured iteration #0
^\Full thread dump Java HotSpot(TM) Client VM (1.5.0-beta-b05 mixed mode):

"Thread-20" prio=6 tid=0x0013a670 nid=0x20 waiting for monitor entry [ef8ff000..ef8ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-19" prio=6 tid=0x00139bc8 nid=0x1f waiting for monitor entry [ef9ff000..ef9ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-18" prio=6 tid=0x00139120 nid=0x1e waiting for monitor entry [efaff000..efaffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-17" prio=6 tid=0x00138678 nid=0x1d waiting for monitor entry [efbff000..efbffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-16" prio=6 tid=0x00137bd0 nid=0x1c waiting for monitor entry [efcff000..efcffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-15" prio=6 tid=0x00137128 nid=0x1b waiting for monitor entry [efdff000..efdffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-14" prio=6 tid=0x00136680 nid=0x1a waiting for monitor entry [efeff000..efeffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-13" prio=6 tid=0x00135bd8 nid=0x19 waiting for monitor entry [effff000..effffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-12" prio=6 tid=0x000a5f58 nid=0x18 waiting for monitor entry [f00ff000..f00ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-11" prio=6 tid=0x000a54b0 nid=0x17 waiting for monitor entry [f01ff000..f01ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-10" prio=6 tid=0x000a4a08 nid=0x16 waiting for monitor entry [f02ff000..f02ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-9" prio=6 tid=0x000a3f60 nid=0x15 waiting for monitor entry [f03ff000..f03ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-8" prio=6 tid=0x000a34b8 nid=0x14 waiting for monitor entry [f04ff000..f04ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-7" prio=6 tid=0x000a2aa8 nid=0x13 waiting for monitor entry [f05ff000..f05ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-6" prio=6 tid=0x000a99d8 nid=0x12 waiting for monitor entry [f06ff000..f06ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-5" prio=6 tid=0x000a8f30 nid=0x11 waiting for monitor entry [f07ff000..f07ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-4" prio=6 tid=0x000a8488 nid=0x10 waiting for monitor entry [f08ff000..f08ffc2c]
        at java.awt.Robot.createScreenCapture(Robot.java:266)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:418)

"Thread-3" prio=6 tid=0x000a79e0 nid=0xf in Object.wait() [f09ff000..f09ffc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf15d9658> (a java.awt.EventQueue$1AWTInvocationLock)
        at java.lang.Object.wait(Object.java:429)
        at java.awt.EventQueue.invokeAndWait(EventQueue.java:829)
        - locked <0xf15d9658> (a java.awt.EventQueue$1AWTInvocationLock)
        at java.awt.Robot.waitForIdle(Robot.java:408)
        - locked <0xf1614dc0> (a java.awt.Robot)
        at java.awt.Robot.autoWaitForIdle(Robot.java:348)
        at java.awt.Robot.afterEvent(Robot.java:321)
        at java.awt.Robot.mouseMove(Robot.java:140)
        - locked <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:420)

"Thread-2" prio=6 tid=0x000a6f98 nid=0xe waiting for monitor entry [f0aff000..f0affc2c]
        at java.awt.Robot.mouseMove(Robot.java:139)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:420)

"Thread-1" prio=6 tid=0x000a6600 nid=0xd waiting for monitor entry [f0bff000..f0bffc2c]
        at java.awt.Robot.mouseMove(Robot.java:139)
        - waiting to lock <0xf1614dc0> (a java.awt.Robot)
        at RobotFrame$StressThread.run(RobotTest.java:420)

"DestroyJavaVM" prio=5 tid=0x0002d050 nid=0x1 waiting on condition [0..ffbfe30c]

"AWT-EventQueue-0" prio=6 tid=0x001f5bf8 nid=0xc in Object.wait() [f0cff000..f0cffc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf1615518> (a RobotFrame$StressThread)
        at java.lang.Thread.join(Thread.java:1001)
        - locked <0xf1615518> (a RobotFrame$StressThread)
        at java.lang.Thread.join(Thread.java:1054)
        at RobotFrame$StressTest.actionPerformed(RobotTest.java:381)
        at java.awt.MenuItem.processActionEvent(MenuItem.java:589)
        at java.awt.MenuItem.processEvent(MenuItem.java:548)
        at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:294)
        at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:282)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:458)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:208)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:143)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:104)

"Java2D Disposer" daemon prio=10 tid=0x001e9088 nid=0xb in Object.wait() [f0dff000..f0dffc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf1615808> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <0xf1615808> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at sun.java2d.Disposer.run(Disposer.java:106)
        at java.lang.Thread.run(Thread.java:534)

"AWT-Motif" daemon prio=6 tid=0x001951a8 nid=0xa runnable [f0eff000..f0effc2c]
        at sun.awt.motif.MToolkit.run(Native Method)
        at java.lang.Thread.run(Thread.java:534)

"AWT-Shutdown" prio=5 tid=0x00194f30 nid=0x9 in Object.wait() [f0fff000..f0fffc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf16158c8> (a java.lang.Object)
        at java.lang.Object.wait(Object.java:429)
        at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
        - locked <0xf16158c8> (a java.lang.Object)
        at java.lang.Thread.run(Thread.java:534)

"CompilerThread0" daemon prio=5 tid=0x000cd558 nid=0x7 waiting on condition [0..fba7f578]

"Signal Dispatcher" daemon prio=10 tid=0x000cc900 nid=0x6 waiting on condition [0..0]

"Finalizer" daemon prio=8 tid=0x000c94e0 nid=0x4 in Object.wait() [fc37f000..fc37fc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf16159c8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <0xf16159c8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x000c7b88 nid=0x3 in Object.wait() [fe27f000..fe27fc2c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf1615570> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:429)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:115)
        - locked <0xf1615570> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=5 tid=0x000c6d58 nid=0x2 runnable

"VM Periodic Task Thread" prio=10 tid=0x000e8cc8 nid=0x8 waiting on condition

"Suspend Checker Thread" prio=10 tid=0x000cbf98 nid=0x5 runnable