When debugging HotSpot 2.0 RC1 with JPDA (from java.sun.com/products/jpda site)
uncaught ThreadDeath exceptions lead to a thread not found error and the
result is that one can no longer debug with the TTY version of jdb.

The VM is run in server mode as follows :-
(note that the HotSpot assertion arises when one hits 'resume' in jdb)

D:\java_g -version
java version "1.2.2"
Java HotSpot(TM) Server VM (2.0rc1, mixed mode, debug build I)

D:\java_g -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5001 Test
Java HotSpot(TM) Server VM warning: Ignoring breakpoint on java.lang.Thread.resu
me
Starting new runner...
Runner started...
Starting new runner...
#
# HotSpot Virtual Machine Error, assertion failure
#
# assert(get_thread(JavaThread::current()) == 0, "current thread already walkabl
e")
#
# Error ID: C:/hotspot\src\share\vm\prims\jvmdi.cpp, 979
#

***********************************************************************

D:\jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=5001
Initializing jdb...
Reference Handler[1]
VM Started: No frames on the current call stack

main[1] cont
main[1]
Exception occurred: java.lang.ThreadDeath (uncaught) Thread not found: Thread-0
java.lang.NullPointerException:
        at com.sun.tools.example.debug.tty.ThreadInfo.setCurrentThread(ThreadInfo.java:145)
        at com.sun.tools.example.debug.tty.EventHandler.setCurrentThread(EventHandler.java:192)
        at com.sun.tools.example.debug.tty.EventHandler.setCurrentThread(EventHandler.java:187)
        at com.sun.tools.example.debug.tty.EventHandler.run(EventHandler.java:82)
        at java.lang.Thread.run(Thread.java:479)

>
> resume
All threads resumed.
>
>

***********************************************************************

The following is the source to Test.java :-
class Runner extends Thread {
    public void run() {
        System.out.println("Runner started...");
        for (;;) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
            }
        }
    }
}

public class Test {
    public static void main(String[] argv) {
        for (;;) {
            try {
                System.out.println("Starting new runner...");
                Thread t = new Runner();
                t.start();
                Thread.sleep(500);
                t.stop();
                Thread.sleep(500);
            } catch (InterruptedException e) {
            }
        }
    }
}