Tech TLDR;

Attach Remote Debugger to Jar File and Scala REPL

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I was investigating a bug that would only happen in production and wanted to attach a debugger to a particular workflow. I could have run the entire application and attached remotely, via: In my case, I wanted to invoke a specific method and see what happens via Scala REPL. Turns out it’s pretty easy to […]

Adding Ammonite REPL to Scala For Ad Hoc Testing

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Ammonite is an interactive REPL for Scala, kind of like ipython is for Python. I usually use IntelliJ IDE for Scala (which has a REPL and debugger among other things). Ammonite is great replacement though, when I don’t want to start up full blown IDE. It’s really easy to get started with Ammonite. First it […]

How to install old version of SBT using Homebrew

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I’ve recently ran into issue where our projects were expecting to run with SBT version 0.13.12, but the only version that was installing with home-brew via brew install sbt was 1.0.1. Global Setting I’ve Googled and realized that I can install older version with brew install sbt@0.13 but this installed version 0.13.16 which was still […]

Save Ammonite (Scala REPL) History to File

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I use Ammonite and ipython like REPL for Scala. I find it handy to save history to file, so here is how to do it in Ammonite. Ammonite exposes a global object called repl, which has a method called history. The code above converts history to a new line separated string and writes it to […]

Write or Paste Multi-Line Code in Scala REPL

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I love Python and ipython, so I often crave similar experience when working with Scala. Scala already has a built in REPL which is a huge plus, however, I wasn’t sure how to copy/paste multi-line text. For example, I had a snippet of code saved somewhere that looked as such: This would work fine if […]