Cay Horstmann 11/8/2025

Help! My LocalDate Isn’t Flattened

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This technical article details an investigation into Project Valhalla's promise of object flattening in Java. The author attempts to reproduce a benchmark showing flattened arrays of LocalDate objects but finds it only works in a specific early-access JDK build, not in a source-built version. The post explores the technical reasons, including the impact of serialization and the challenges of representing null values within flattened value types.

Help! My LocalDate Isn’t Flattened

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