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JDK 27

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Jun 1, 2026 · Fundamentals

JDK 27 Trims Two API Methods: Introducing JEP 531 and Set.ofLazy()

JDK 27’s third preview (JEP 531) removes the isInitialized() and orElse() methods from the LazyConstant API, adds a Set.ofLazy() factory method, and refines the lazy‑constant design to improve composability, startup performance, thread safety, and JVM optimizations.

API changesJDK 27JEP 531

0 likes · 11 min read

JDK 27 Trims Two API Methods: Introducing JEP 531 and Set.ofLazy()

Java Backend Technology

May 27, 2026 · Fundamentals

JDK 27 Cuts Object Header Overhead by 33% and Reduces CPU Usage by Up to 30%

JDK 27 introduces JEP 534, making compact object headers the default layout, shrinking the 12‑byte header to 8 bytes (a 33% reduction), which lowers heap memory consumption by over 20%, cuts CPU time by 8‑30% in benchmarks, reduces GC pressure, and requires no code changes.

Compact Object HeadersJDK 27JEP 534

0 likes · 13 min read

JDK 27 Cuts Object Header Overhead by 33% and Reduces CPU Usage by Up to 30%

JDK 27

JDK 27 Trims Two API Methods: Introducing JEP 531 and Set.ofLazy()

JDK 27 Cuts Object Header Overhead by 33% and Reduces CPU Usage by Up to 30%

JDK 27 Trims Two API Methods: Introducing JEP 531 and Set.ofLazy()

JDK 27 Cuts Object Header Overhead by 33% and Reduces CPU Usage by Up to 30%