totetete

What is it?

It connects to a jvm via java debug interface (JDI) and steps through your code, displaying or recording each line.

Why

1. record working and broken test runs, diff and pinpoint exactly the line where things diverge
2. learn what the app is actually doing

How to use it?

1. add "-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005" to jvm options of your app (:jvm-opts vector in profile.clj for leiningen projects)
2. create and start a thread named "totetete-start" to start the recording (it doesn't need to do any work, it's just to catch a thread start event with this name). it is an optimization to delay instrumentation until your app is initialized, as instrumentation brings a big performance hit.
3. create and start a thread named "totetete-stop" to stop the recording and remove instrumentation

Didn't you already write jdi-steprecorder?

I did, and then removed it due unclear code ownership (I wrote it during work hours at Atlassian, so while I was never explicitly tasked to make it, I made it to debug the project I worked on. This is a clean slate reimplementation.