So, after figuring out how to build and debug Jenkins, I discovered the answer I was looking for.
The groovy script has to return an array of strings in the groovy 'choice' variable: def mydata = ['string 1', 'string 2', 'string 3', 'string 4', 'string 5' ] choice = mydata It is as simple as that. Now I have my list of strings in the listbox so developers can choose their 'AccuRev-Workspace' and perform a preflight build on it. Bob