It looks like a simple conversion to HashMap is possible.
I'll fix this since I'm working in the area atm.
2007-06-05 Mike Cvet <mcvet@redhat.com> * hpd/CLI.java: Turned Hashtables into HashMaps. Fixes #3986. (running): Added. (StepHandler): Added. Handler for line stepping. Fixes #4594. (StepInstructionHandler): Added. Handler for instruction steping. Fixes #4594. (WhereHandler.handle): Bail immediately if the process is running. Fixes #4595. (GoHandler.handle): Sets running boolean. (HaltHandler.handle): Unsets running boolean. (CLI): Added new stepping handlers.