Java 21 Articles

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6/25/2026 • EN

Hardwood 1.0: A Fast, Lightweight Apache Parquet Reader for the JVM

Hardwood 1.0 is a fast, lightweight, multi-threaded Apache Parquet reader for the JVM with no mandatory dependencies.

Apache Parquet Hardwood Java 21 jvm Parquet Reader

Gunnar Morling

8/27/2023 • EN

Upgrading From Java 17 To 21: All You Need To Know

A guide to upgrading Java projects from version 17 to 21, covering new features, potential migration issues, and best practices.

Java Java 17 Java 21 migration upgrade

Nicolai Parlog

6/22/2023 • EN

Java 21 - The Other Side - Inside Java Newscast #51

A detailed look at new features and changes in Java 21, including the Scoped Values API, from the Inside Java Newscast.

Java Java 21 Openjdk Scoped Values Threadlocal

Nicolai Parlog

6/8/2023 • EN

All That is in Java 21?! 😱 - Inside Java Newscast #50

A whirlwind tour of all new features, finalized APIs, and previews coming in the upcoming JDK 21 release, including virtual threads and pattern matching.

concurrency Java Java 21 Jdk jvm

Nicolai Parlog

Java 21 Articles

Hardwood 1.0: A Fast, Lightweight Apache Parquet Reader for the JVM

Upgrading From Java 17 To 21: All You Need To Know

Java 21 - The Other Side - Inside Java Newscast #51

All That is in Java 21?! 😱 - Inside Java Newscast #50

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