samdeepthink

Sep 21, 2026 · Fundamentals

Java final Visibility: JMM Freeze, This Escape, and Lock-Free Guarantees

This article explains how Java's final keyword ensures cross-thread visibility of final fields through the JMM's freeze action at constructor end, provided the this reference does not escape during construction, demonstrating with a code example that shows a race condition when this escapes and the correct behavior when final fields are properly frozen.