A deadlock occurs in AWT if a certain code is executed.
The code is in the Comments section.

The trace follows:
[pv76716@druid]~/jprogs$ java WTest
Constructor done
^\Full thread dump Java HotSpot(TM) 64-Bit Server VM (1.4.1-b21 mixed mode):

"DestroyJavaVM" prio=5 tid=0x10010eb20 nid=0x1 waiting on condition [0..ffffffff7fffe440]

"AWT-EventQueue-0" prio=6 tid=0x1004f97b0 nid=0x11 waiting for monitor entry [ffffffff2e1ff000..ffffffff2e201520]
        at sun.awt.motif.X11FontMetrics.getMFCharsWidth(Native Method)
        at sun.awt.motif.X11FontMetrics.charsWidth(X11FontMetrics.java:169)
        at sun.awt.motif.X11FontMetrics.stringWidth(X11FontMetrics.java:159)
        at sun.awt.motif.MButtonPeer.getMinimumSize(MButtonPeer.java:27)
        at sun.awt.motif.MComponentPeer.getPreferredSize(MComponentPeer.java:392)
        at sun.awt.motif.MComponentPeer.preferredSize(MComponentPeer.java:870)
        at java.awt.Component.preferredSize(Component.java:1987)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Component.getPreferredSize(Component.java:1968)
        at java.awt.FlowLayout.layoutContainer(FlowLayout.java:437)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Container.layout(Container.java:1017)
        at java.awt.Container.doLayout(Container.java:1007)
        at java.awt.Container.validateTree(Container.java:1089)
        at java.awt.Container.validate(Container.java:1064)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.dispatchEventImpl(Window.java:1583)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

"Thread-3" prio=5 tid=0x1004f93c0 nid=0x10 waiting for monitor entry [ffffffff2e380000..ffffffff2e381520]
        at java.awt.ContainerOrderFocusTraversalPolicy.getFirstComponent(ContainerOrderFocusTraversalPolicy.java:226)
        - waiting to lock <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.ContainerOrderFocusTraversalPolicy.getDefaultComponent(ContainerOrderFocusTraversalPolicy.java:315)
        at java.awt.Window.isFocusableWindow(Window.java:1410)
        at sun.awt.motif.MWindowPeer.pShow(Native Method)
        at sun.awt.motif.MWindowPeer.toFront(MWindowPeer.java:140)
        at java.awt.Window.toFront(Window.java:623)
        at WTest$TestWindow.run(WTest.java:62)
        at java.lang.Thread.run(Thread.java:536)

"Thread-1" daemon prio=5 tid=0x1004e2410 nid=0xf in Object.wait() [ffffffff2e500000..ffffffff2e501520]
        at java.lang.Object.wait(Native Method)
        - waiting on <ffffffff31600f10> (a java.util.TaskQueue)
        at java.util.TimerThread.mainLoop(Timer.java:429)
        - locked <ffffffff31600f10> (a java.util.TaskQueue)
        at java.util.TimerThread.run(Timer.java:382)

"Java2D Disposer" daemon prio=10 tid=0x1004e8230 nid=0xe in Object.wait() [ffffffff2e680000..ffffffff2e681520]
        at java.lang.Object.wait(Native Method)
        - waiting on <ffffffff31600fe0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <ffffffff31600fe0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at sun.java2d.Disposer.run(Disposer.java:97)
        at java.lang.Thread.run(Thread.java:536)

"AWT-Motif" daemon prio=6 tid=0x1004c6d50 nid=0xd waiting for monitor entry [ffffffff2ee81000..ffffffff2ee81520]
        at sun.awt.motif.MToolkit.run(Native Method)
        at java.lang.Thread.run(Thread.java:536)

"AWT-Shutdown" prio=5 tid=0x10046a950 nid=0xc in Object.wait() [ffffffff2f380000..ffffffff2f381520]
        at java.lang.Object.wait(Native Method)
        - waiting on <ffffffff32a4ea18> (a java.lang.Object)
        at java.lang.Object.wait(Object.java:426)
        at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
        - locked <ffffffff32a4ea18> (a java.lang.Object)
        at java.lang.Thread.run(Thread.java:536)

"Signal Dispatcher" daemon prio=10 tid=0x1001f0220 nid=0x9 waiting on condition [0..0]

"Finalizer" daemon prio=8 tid=0x1001e7e00 nid=0x6 in Object.wait() [ffffffff39780000..ffffffff39781520]
        at java.lang.Object.wait(Native Method)
        - waiting on <ffffffff32a4ec28> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <ffffffff32a4ec28> (a java.lang.ref.ReferenceQueue$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=0x1001e7a90 nid=0x5 in Object.wait() [ffffffff3aa01000..ffffffff3aa01520]
        at java.lang.Object.wait(Native Method)
        - waiting on <ffffffff32a1e9d8> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:426)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
        - locked <ffffffff32a1e9d8> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=5 tid=0x1001e58f0 nid=0x4 runnable

"VM Periodic Task Thread" prio=10 tid=0x1001eef20 nid=0x7 waiting on condition
"Suspend Checker Thread" prio=10 tid=0x1001ef870 nid=0x8 runnable

Found one Java-level deadlock:
=============================
"AWT-EventQueue-0":
  waiting to lock monitor 0x1e8668 (object 0x35686460, a java.lang.Class)
  in JNI, which is held by "Thread-3"
"Thread-3":
  waiting to lock monitor 0x1e8758 (object 0x32a4f7b0, a java.awt.Component$AWTTreeLock),
  which is held by "AWT-EventQueue-0"

Java stack information for the threads listed above:
===================================================
"AWT-EventQueue-0":
        at sun.awt.motif.X11FontMetrics.getMFCharsWidth(Native Method)
        at sun.awt.motif.X11FontMetrics.charsWidth(X11FontMetrics.java:169)
        at sun.awt.motif.X11FontMetrics.stringWidth(X11FontMetrics.java:159)
        at sun.awt.motif.MButtonPeer.getMinimumSize(MButtonPeer.java:27)
        at sun.awt.motif.MComponentPeer.getPreferredSize(MComponentPeer.java:392)
        at sun.awt.motif.MComponentPeer.preferredSize(MComponentPeer.java:870)
        at java.awt.Component.preferredSize(Component.java:1987)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Component.getPreferredSize(Component.java:1968)
        at java.awt.FlowLayout.layoutContainer(FlowLayout.java:437)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Container.layout(Container.java:1017)
        at java.awt.Container.doLayout(Container.java:1007)
        at java.awt.Container.validateTree(Container.java:1089)
        at java.awt.Container.validate(Container.java:1064)
        - locked <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.dispatchEventImpl(Window.java:1583)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
"Thread-3":
        at java.awt.ContainerOrderFocusTraversalPolicy.getFirstComponent(ContainerOrderFocusTraversalPolicy.java:226)
        - waiting to lock <ffffffff32a4f7b0> (a java.awt.Component$AWTTreeLock)
        at java.awt.ContainerOrderFocusTraversalPolicy.getDefaultComponent(ContainerOrderFocusTraversalPolicy.java:315)
        at java.awt.Window.isFocusableWindow(Window.java:1410)
        at sun.awt.motif.MWindowPeer.pShow(Native Method)
        at sun.awt.motif.MWindowPeer.toFront(MWindowPeer.java:140)
        at java.awt.Window.toFront(Window.java:623)
        at WTest$TestWindow.run(WTest.java:62)
        at java.lang.Thread.run(Thread.java:536)

Found 1 deadlock.