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OpenJDK teams have outlined their 2026 roadmap: Project Valhalla's value types target JDK 28, Structured Concurrency nears finalization, and Project Amber continues with pattern assignment and constant patterns. Experimental prototypes include type classes for external behavior attachment, runtime null-safety enforcement with the "bang world" prototype, and discussions around ephemeral threads for garbage-collectable virtual threads. The Vector API awaits Valhalla's value types for its rewrite, while Babylon prepares code reflection for framework use. These developments show Java carefully adapting functional programming concepts while maintaining backward compatibility.

While the ink is still wet: JDK Mailing Lists and Java’s Plans for 2026 - JVM Weekly vol. 159

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