adds support for building the model of a program for which the classpath is incomplete

No, it doesn't describe everything. Why don't you want to give as much context as possible to debug the application?
I recommend describing the intention of the try block with the string. e.getMessage of the stacked exception describes it from the sub process and the spoon exception describes the "whole" process.. So the stacked exceptions give more detail about the problem but nevertheless you should describe the big process too. I don't see the problem.