Java 21 Scoped Values: A Deep Dive with Examples

Date: 2024-01-26

Java 21 introduces Scoped Values, a more efficient alternative to ThreadLocal for sharing data within and across threads, especially beneficial with the rise of virtual threads. Unlike mutable ThreadLocal variables prone to memory leaks, Scoped Values are immutable and have a defined lifespan. They are created using ScopedValue and bound using the .where() method. Rebinding allows for data transformation. For sharing multiple values, using records is recommended for maintainability. Scoped Values offer lightweight, efficient data sharing in multithreaded applications.

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