When audio is being played the appletviewer will core dump audio is busy.
To reproduce:

1. Bring up the appletviewer with TicTacToe applet.
2. Click on a box to play to open up the audio port.
3. cat sounds/*.au > /dev/audio or use audioplay or whatever to keep the /dev/audio busy
    for a long time.
4. while 3 is going on play the ticTacToe.
And you will see it will try retry for 3 times and attempt to write to the audio port
and core dump.
Here is the trace:

Full thread dump:
    "Image Fetcher 3" (TID:0xee7015e8, sys_thread_t:0xede91de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 2" (TID:0xee701488, sys_thread_t:0xedec1de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 1" (TID:0xee7012e0, sys_thread_t:0xedef1de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 0" (TID:0xee7010b0, sys_thread_t:0xedf21de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Audio Player" (TID:0xee700be0, sys_thread_t:0xedf91de0) prio=10 *current thread*
sun.audio.AudioDevice.play(AudioDevice.java:368)
sun.audio.AudioPlayer.run(AudioPlayer.java:118)
    "applet-TicTacToe-Handler" (TID:0xee702738, sys_thread_t:0xedfc1de0) prio=6
java.lang.Object.wait(Object.java)
ibm.JEmpower.AppletFrame.getNextEvent(AppletFrame.java:387)
ibm.JEmpower.AppletFrame.run(AppletFrame.java:421)
java.lang.Thread.run(Thread.java)
    "Screen Updater" (TID:0xee7021d8, sys_thread_t:0xedff1de0) prio=4
java.lang.Object.wait(Object.java)
sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:75)
sun.awt.ScreenUpdater.run(ScreenUpdater.java:95)
    "AWT-Motif" (TID:0xee701520, sys_thread_t:0xee0f1de0) prio=5
java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee7014f8, sys_thread_t:0xee121de0) prio=5
    "Finalizer thread" (TID:0xee7003b0, sys_thread_t:0xee3f1de0) prio=1
    "Async Garbage Collector" (TID:0xee700368, sys_thread_t:0xef441de0) prio=1
    "Idle thread" (TID:0xee700320, sys_thread_t:0xef471de0) prio=0
    "clock handler" (TID:0xee7001f8, sys_thread_t:0xef551de0) prio=11
    "main" (TID:0xee7000a0, sys_thread_t:0xbbb98) prio=5
ibm.JEmpower.JEmpower.main(JEmpower.java:95)
SIGABRT 6* abort (generated by abort(3) routine)
    si_signo [6]: SIGABRT 6* abort (generated by abort(3) routine)
    si_errno [0]: Error 0
    si_code [0]: SI_USER [pid: 3576, uid: 8019]
stackbase=EDF92000, stackpointer=EDF91170

Full thread dump:
    "Image Fetcher 3" (TID:0xee7015e8, sys_thread_t:0xede91de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 2" (TID:0xee701488, sys_thread_t:0xedec1de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 1" (TID:0xee7012e0, sys_thread_t:0xedef1de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Image Fetcher 0" (TID:0xee7010b0, sys_thread_t:0xedf21de0) prio=8
java.lang.Object.wait(Object.java)
sun.awt.image.ImageFetcher.nextImage(ImageFetcher.java:81)
sun.awt.image.ImageFetcher.run(ImageFetcher.java:96)
    "Audio Player" (TID:0xee700be0, sys_thread_t:0xedf91de0) prio=10 *current thread*
sun.audio.AudioDevice.play(AudioDevice.java:368)
sun.audio.AudioPlayer.run(AudioPlayer.java:118)
    "applet-TicTacToe-Handler" (TID:0xee702738, sys_thread_t:0xedfc1de0) prio=6
java.lang.Object.wait(Object.java)
ibm.JEmpower.AppletFrame.getNextEvent(AppletFrame.java:387)
ibm.JEmpower.AppletFrame.run(AppletFrame.java:421)
java.lang.Thread.run(Thread.java)
    "Screen Updater" (TID:0xee7021d8, sys_thread_t:0xedff1de0) prio=4
java.lang.Object.wait(Object.java)
sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:75)
sun.awt.ScreenUpdater.run(ScreenUpdater.java:95)
    "AWT-Motif" (TID:0xee701520, sys_thread_t:0xee0f1de0) prio=5
java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee7014f8, sys_thread_t:0xee121de0) prio=5
    "Finalizer thread" (TID:0xee7003b0, sys_thread_t:0xee3f1de0) prio=1
    "Async Garbage Collector" (TID:0xee700368, sys_thread_t:0xef441de0) prio=1
    "Idle thread" (TID:0xee700320, sys_thread_t:0xef471de0) prio=0
    "clock handler" (TID:0xee7001f8, sys_thread_t:0xef551de0) prio=11
    "main" (TID:0xee7000a0, sys_thread_t:0xbbb98) prio=5
ibm.JEmpower.JEmpower.main(JEmpower.java:95)
Monitor Cache Dump:
    unknown key (key=0xef441de0): unowned
Waiting to be notified:
"Async Garbage Collector"
    sun.awt.ScreenUpdater@EE7021D8/EE73A010 (key=0xee7021d8): unowned
Waiting to be notified:
"Screen Updater"
    sun.audio.AudioDevice@EE700CF8/EE741268 (key=0xee700cf8): monitor owner: "Audio Player"
    sun.awt.motif.MToolkit@EE7014E0/EE7378F0 (key=0xee7014e0): monitor owner: "AWT-Motif"
    ibm.JEmpower.AppletFrame@EE7026C8/EE73B290 (key=0xee7026c8): unowned
Waiting to be notified:
"applet-TicTacToe-Handler"
    java.util.Vector@EE7016C0/EE741DB8 (key=0xee7016c0): unowned
Waiting to be notified:
"Image Fetcher 3"
"Image Fetcher 1"
"Image Fetcher 2"
"Image Fetcher 0"
Registered Monitor Dump:
    Finalize me queue lock: unowned
Waiting to be notified:
"Finalizer thread"
    Thread queue lock: unowned
    Class lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
Waiting to be notified:
"AWT-Input"
    Alarm monitor: unowned
Waiting to be notified:
"clock handler"
    Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "Audio Player"
Thread Alarm Q:
    sys_thread_t 0xee121de0 [Timeout expired]
    sys_thread_t 0xef441de0 [Timeout in 5 ms]

*** panic: "../../../../src/solaris/java/green_threads/src/iomgr.c", line 516: assertion failure



So the bottom line is that java closes the stream and but AudioPlayer does not check the
return since the audioOpen is a void.

Here is how I worked around the problem such that java will not crash.
354c354
< public synchronized void play() {
---
> public void play() {
356d355
< System.out.println("In audioplay now");
369,374c368
< // The check here is to ensure that the audio device is not closed.
< // If not java will core dump like AppletViewer spr#QWUU38BLCT
< if (dev > 0) {
< audioWrite(ulaw, ulaw.length);
< }
<
---
> audioWrite(ulaw, ulaw.length);