In the beginning of my IT career, I started as a JEE developer. It was a heavy, hard-to-use technology but anyways used in most companies. Because of this hard-to-use, I learnt how to bypass a long process of constant redeployments, just by writing much quicker unit-tests. Unintentionally, it lead me to writing better code as I started to think how to write a testable code. After many years in the industry, I switched to more light-weight web and integration technologies like spring and vertx but the very same techniques of writing code are ironically very up-to-date even though the underlying technology went obsolete or not recommended anymore.