Docker

• Advanced multi-stage build patterns

Java

• Java Stream API was Broken Before JDK10
• Java 12: Mapping with Switch Expressions
• Can instanceof make Unmodifiable Collections faster?
• A look at the Optional datatype in Java and some anti-patterns when using it
• JEP draft: Add detailed message to NullPointerException describing what is null

Kotlin

• How Kotlin helps you avoid memory leaks
• Discovering Kotlin Contracts
• KotlinConf 2017 - Introduction to Coroutines by Roman Elizarov (video)

Machine Learning

• Decision Trees — An Intuitive Introduction
• The Random Forest Algorithm
• Interpretable Machine Learning - Extracting human understandable insights from any Machine Learning model

Reactive programming

• The fight for performance – Is reactive programming the right approach?
• Demystifying Functional Reactive Programming
• Going Reactive with Spring, Coroutines and Kotlin Flow

Software Engineering

• Lessons Learned After a Decade of Building Software
• Common developer pitfalls that even seniors struggle with
• The other side of technical skill: domain knowledge and long-term vision
• Am I a “real” Software Engineer yet?
• Time traps that software developers face - And how to mitigate them

Testing

• Easy testing with ObjectMothers and EasyRandom