Apache BSF II (Debugger Framework)

Debugging support has been added to BSF over the last year. In its current form, only debugging of Javascript in JSPs is supported. The focus has been to design an API that would permit a generic debugging framework for multiple scripting engines; however, this has remained an goal for BSF 3.0. Included in the debugging support for BSF 2.3 is a rudimentary command-line debugger named jsdb, which acts as a client to a debugging server that is managed by the BSFManager.
An example of a production debugger using the BSF debugging engine is at http://www.eclipse.org/.