I was recently faced with the perplexing problem of making Spring and MongoDB serialize/deserialize a polymorphic class. Initially, it seemed like a simple task, but it proved to be more complicated than anticipated. Allow me to share my solution.

Here we go again with a new article derived from my work notes. As you already know, I am rewriting a backend application in Kotlin and — in the process — I am improving all the horrors of legacy code I can find. In this article, we will look at one critical aspect of software development (especially for REST applications): the documentation.

In the last week I converted a medium-sized legacy Java/Spring codebase to Kotlin. In this article I’ll discuss the pro and the challenges I faced during this transition.