Debug interface?

Hi,
<<newby alert, new to bean shell, newish to Java, experienced (15 years or
so) C/C++ developer>>
I've just inherited someone else's project here, and he used beanshell to
add scripting facilities to our main app. I now have the task of extending
this, and one requirement is a 'debug mode' to allow debugging of the
scripts, nothing too fancy, breakpoints, inspect variables, single step
through code. I have been unable to find any 'hooks' in beanshell for adding
such facilities, such as found in typical REXX implementations. Do you guys
have any pointers for me?
,Philip