Run any jfc demo's inside appletviewer and try to resize it.
After after unpredictable number of iterations next exception is occurred and appletviewer hangs:

2013-10-29 22:22:32.882 appletviewer[94789:707] java.lang.RuntimeException: Event posted on wrong app context : java.awt.event.MouseEvent[MOUSE_EXITED,(419,-570),absolute(419,54),button=0,clickCount=0] on label0
at sun.awt.SunToolkit.postEvent(SunToolkit.java:499)
at sun.lwawt.LWComponentPeer.postEvent(LWComponentPeer.java:1166)
at sun.lwawt.LWWindowPeer.postMouseExitedEvent(LWWindowPeer.java:898)
at sun.lwawt.LWWindowPeer.generateMouseEnterExitEventsForComponents(LWWindowPeer.java:865)
at sun.lwawt.LWWindowPeer.notifyMouseEvent(LWWindowPeer.java:754)
at sun.lwawt.macosx.CPlatformResponder.handleMouseEvent(CPlatformResponder.java:83)
at sun.lwawt.macosx.CPlatformView.deliverMouseEvent(CPlatformView.java:198)
2013-10-29 22:22:32.883 appletviewer[94789:707] (
0 CoreFoundation 0x00007fff8c1a3b06 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff8c7e43f0 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8c237f49 -[NSException raise] + 9
3 JavaNativeFoundation 0x000000011fb32539 JNFCallVoidMethod + 209
4 libawt_lwawt.dylib 0x0000000120647378 -[AWTView deliverJavaMouseEvent:] + 737
5 libawt_lwawt.dylib 0x0000000120647433 -[AWTView mouseMoved:] + 160
6 AppKit 0x00007fff8cff6968 -[NSWindow sendEvent:] + 7967
7 libawt_lwawt.dylib 0x000000012064883d -[AWTWindow_Normal sendEvent:] + 86
8 AppKit 0x00007fff8cff232c -[NSApplication sendEvent:] + 4969
9 libosxapp.dylib 0x000000012072d646 -[NSApplicationAWT sendEvent:] + 265
10 AppKit 0x00007fff8cf0821a -[NSApplication run] + 636
11 libosxapp.dylib 0x000000012072d4d8 +[NSApplicationAWT runAWTLoopWithApp:] + 156
12 libawt_lwawt.dylib 0x0000000120686eff -[AWTStarter starter:] + 873
13 Foundation 0x00007fff8fa7c5ca __NSThreadPerformPerform + 225
14 CoreFoundation 0x00007fff8c122b31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
15 CoreFoundation 0x00007fff8c122455 __CFRunLoopDoSources0 + 245
16 CoreFoundation 0x00007fff8c1457f5 __CFRunLoopRun + 789
17 CoreFoundation 0x00007fff8c1450e2 CFRunLoopRunSpecific + 290
18 appletviewer 0x0000000102a9266b CreateExecutionEnvironment + 871
19 appletviewer 0x0000000102a8e60c JLI_Launch + 1952
20 appletviewer 0x0000000102a94632 main + 110
21 appletviewer 0x0000000102a8de64 start + 52
22 ??? 0x0000000000000002 0x0 + 2