You can use Javassist to catch changes the value
of a field but not a local variable. The way to
catching the changes of the value of a local
variable is currently not provided.
Thank you for your response. Let me ask you this - is there more documentation on how to use $_ and the other "metavariables"? I think I have things figured out to that point but could use more examples. The only documentation I have found is the first PDF paper listed on the web site.
Oh, please look at the tutorial, which is also
listed on the web site.