Max Mulatz klappradla

Debugging in JRuby

Step-by-step debugging and stack navigation for JRuby code.

Problem: the common tools byebug and pry-byebug are MRI-only.

Prerequisites

Force JRuby to run in fully interpreted mode:
(otherwise next would behave like step)

Procs vs. Lambdas

Seem the same:

[1] pry(main)> pr = proc { p "Hi" }
=> #<Proc:0x007fdc7a1398f0@(pry):8>
[2] pry(main)> lam = -> { p "Hi" }
=> #<Proc:0x007fdc79c53110@(pry):9 (lambda)>
[3] pry(main)> pr.class

Downgrade tmux installed via homebrew to v 29.a.

Uninstall current version and install from the old formula:

brew uninstall tmux
brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/c8cff106b17b90472cc6e251b9e5c2daf4fd8d46/Formula/tmux.rb

Pin the version to prevent it from accidental upgrades:

	begin
	require "bundler/inline"
	rescue LoadError => e
	$stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
	raise e
	end

	gemfile(true) do
	source "https://rubygems.org"

	#!/bin/sh

	set -o errexit
	set -o nounset

	# Create directory
	mkdir example && cd example

	# Initialize Git repository
	git init && git commit --allow-empty -m "init commit"

	# check if a formula is still needed
	brew uses —installed formula

	cd `brew --prefix`
	git fetch origin
	git reset --hard origin/master