jdb does not kill child processes when it exits. The following is a
simple reproducible case:

    - Start jdb:
/usr/local/java/latestJDK/bin/appletviewer -debug http://www/~jkanerva/bugReports/t.html

    - Issue "run" command, then after waiting for image to be drawn, "quit"

jdb then exits but the applet is left running.