If jacoco can "extract" used code into a mini slice of the original large project

[benjam...@gmail.com]

Friends suggested I take a look at this project when I asked them the following scenario. Perfectly fine if this is too far outside the use case, thank you for any advice!

Background: I found a large-ish open source java project (lots of plugins, old code, a swing GUI, etc) and was able to get a test run working that successfully executes the feature I was looking for. Great first step! I then rampaged around and deleted all other main() calls and test cases. In theory, the only thing that can be run are the lines I'm particularly interested in.

Goal: Is there a way to use JaCoCo (or a profiler's log or some other method) to run the app, watch which lines get used, and "lift" out *only* the minimal necessary code into a new mini-project?

I've tried using IntelliJ "unused declaration" to iteratively prune, but the compiler said that broke everything.

[Marc Hoffmann]

Hi,

I remember a quite old tool (based on Clover) which exactly did what you want:

https://github.com/codehaus/ashcroft/tree/master/guantanamo

I never tried it.

Regards,
-marc

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