Crafting Java policy files, a practical guide–Nicolas Fränkel writes about generating Security Manager policy files the easy way, which has traditionally been the biggest barrier to more people using the Security Manager in the JVM. If you're unaware of the Security Manager, Nicolas has earlier posts that explain what it is and why you'd want to use it.

Pattern Matching for Java — Semantics–Gavin Bierman and Brian Goetz provide some of their current thoughts on pattern matching in a future version of Java.

Understanding Class Initialization in GraalVM Native Image Generation–Christian Wimmer from Oracle, explains how class initialization happens with native images produced by GraalVM.

From Java 8 to Java 11–Stephen Colebourne, of JodaTime fame, describes his experiences with moving from Java 8 to Java 11

Spring Boot Chaos Monkey–If you're not aware of the term "Chaos Monkey", it's from a Netflix service that would randomly kill an instance of one of their services to force them to handle faults. Viktor at The Curious Dev has released a similar tool for Spring Boot applications to throw a spanner in the works during development, so you can make your application more robust in production.