jdb debugging client exits for no apparent reason

The debuggee client exits abruptly for no reason.


TEST CASE
Run WireFrame under JDB: the client exits after one second.

jdb sun.applet.AppletViewer example1.html
Initializing jdb...
0x14973e8:class(sun.applet.AppletViewer)
> run
run sun.applet.AppletViewer example1.html
running ...
main[1]
sun.applet.AppletViewer exited <<<<<<<< HERE
main[1] at init time, CM = java.awt.image.IndexColorModel@149d0a8
Input stream closed.

<<< CTRL-BREAK produces: >>>>

Full thread dump:
    "Screen Updater" (TID:0x149cc50, sys_thread_t:0x7e841c,
Win32ID:0xfe, state:
CONDVAR_WAIT) prio=5
        java.lang.Object.wait(Object.java:152)
        sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:75)
        sun.awt.ScreenUpdater.run(ScreenUpdater.java:95)
    "AWT-Callback-Win32" (TID:0x149c930, sys_thread_t:0x804900,
Win32ID:0xbe, st
ate:RUNNABLE) prio=5
        sun.awt.win32.MToolkit.run(MToolkit.java:66)
        java.lang.Thread.run(Thread.java:294)
    "AWT-Win32" (TID:0x149c8d8, sys_thread_t:0x7f12bc, Win32ID:0xbb,
state:RUNNA
BLE) prio=5
        sun.awt.win32.MToolkit.run(MToolkit.java:64)
        java.lang.Thread.run(Thread.java:294)
    "thread applet-ThreeD.class" (TID:0x149c7c8, sys_thread_t:0x7fb5c4,
Win32ID:
0xb2, state:CONDVAR_WAIT) prio=5
        java.lang.Object.wait(Object.java:152)
        sun.applet.AppletPanel.getNextEvent(AppletPanel.java:185)
        sun.applet.AppletPanel.run(AppletPanel.java:216)
        java.lang.Thread.run(Thread.java:294)
    "Agent input" (TID:0x1494168, sys_thread_t:0x7a6140, Win32ID:0xf5,
state:CON
DVAR_WAIT) prio=10
        java.io.PipedInputStream.read(PipedInputStream.java:152)
        java.io.PipedInputStream.read(PipedInputStream.java:184)
        java.io.BufferedInputStream.fill(BufferedInputStream.java:107)
        java.io.BufferedInputStream.read(BufferedInputStream.java:121)
        java.io.FilterInputStream.read(FilterInputStream.java:52)
        sun.tools.debug.AgentIn.run(AgentIn.java:43)
        java.lang.Thread.run(Thread.java:294)
    "Breakpoint handler" (TID:0x1493998, sys_thread_t:0x7819c4,
Win32ID:0x87, st
ate:CONDVAR_WAIT) prio=8
        java.lang.Object.wait(Object.java:152)
       
sun.tools.debug.BreakpointQueue.nextEvent(BreakpointQueue.java:33)
        sun.tools.debug.BreakpointHandler.run(BreakpointHandler.java:184)
    "Debugger agent" (TID:0x1493810, sys_thread_t:0x794964,
Win32ID:0xa6, state:
CONDVAR_WAIT) prio=10
        java.io.PipedInputStream.read(PipedInputStream.java:152)
        java.io.FilterInputStream.read(FilterInputStream.java:52)
        sun.tools.debug.Agent.run(Agent.java:324)
        java.lang.Thread.run(Thread.java:294)
    "Finalizer thread" (TID:0x14931f8, sys_thread_t:0x777f0c,
Win32ID:0x8d, stat
e:CONDVAR_WAIT) prio=2
    "main" (TID:0x14930a0, sys_thread_t:0x7694d4, Win32ID:0xe4,
state:CONDVAR_WA
IT) prio=5
Monitor Cache Dump:
    unknown key (key=0x75f680): <unowned>
    unknown key (key=0x75e614): <unowned>
    sun.tools.debug.BreakpointQueue@14939D0/152F7D8
(key=0x14939d0): <unowned>
        waiters = 1
    sun.applet.AppletViewerPanel@149C620/1554D58 (key=0x149c620):
<unowned>
        waiters = 1
    java.io.PipedInputStream@1493F70/1531180 (key=0x1493f70):
<unowned>
        waiters = 1
    java.io.PipedInputStream@1493F80/15315A8 (key=0x1493f80):
<unowned>
        waiters = 1
    unknown key (key=0x75defc): <unowned>
    sun.awt.ScreenUpdater@149CC50/15566D0 (key=0x149cc50):
<unowned>
        waiters = 1
    sun.awt.win32.MToolkit@149C8D0/1555750 (key=0x149c8d0):
"AWT-Win32"
    unknown key (key=0x75f264): <unowned>
    java.io.BufferedInputStream@1494140/1533EC0 (key=0x1494140):
"Agent input"
Registered Monitor Dump:
    Finalize me queue lock: <unowned>
        waiters = 1
    Thread queue lock: <unowned>
        waiters = 1
    Class lock: <unowned>
    Java stack lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Has finalization queue lock: <unowned>
    Monitor cache lock: <unowned>
    Monitor registry: <unowned>