Why it matters

Valhalla enables C-like performance for value semantics. Understanding shapes future Java performance.

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The architecture

Value classes: no identity, flat memory layout.

Specialized generics: no boxing.

Valhalla featuresValue classesno identity, flatSpecialized genericsno boxingMigration pathsfor existing codeJava 22+ has preview value class support; full delivery years out
Valhalla components.
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How it works end to end

Preview status: value classes in Java 24 preview.

Migration: existing classes can become value classes with care.

Impact: significant for data-heavy code.