In general it looks good, I'd just like to know the reasoning behind the executor and potentially we can re-think the way we handle tests/examples anyway.

Technically this should find all tagged Examples rather than searching some jars for some .class files with a main method and having Test in the name :D
But that's something for a follow up I guess, this is certainly better than the one before.

Edit: you even said Uses thread pool for launching the apps instead of always spawning a new thread.
What is your worry there? the overhead of creating a thread? because those are heavy and slow examples anyway, not unit tests.
A thread pool may be useless when only one thread is used at once all the time and also properly removing the thread may reduce side effects, hypothetically