In this post, I’ll walk through some of the behind-the-scenes details of one of Project Valhalla’s core features: value classes, and the concept of flattening (or inlining, the term I will use here). Whether you’re a JVM developer or just deeply cur…

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Project Valhalla introduces value classes with flattening (inlining) capabilities to optimize Java class metadata. This technical deep dive explores the behind-the-scenes implementation details of how value classes work at the JVM level, focusing on memory layout optimizations and array handling improvements.

Optimizing Java Class Metadata in Project Valhalla – Inside.java