Amazon Corretto 27, a new OpenJDK distribution, is now generally available

Corretto 27 adds protection against future quantum computing threats by combining classical and post-quantum key exchange algorithms in TLS 1.3 connections.

Sensitive data can now be redacted from Java Flight Recorder recordings before leaving the JVM, enhancing protection of confidential information during profiling and diagnostics.

Support for primitive types in patterns, `instanceof`, and `switch` statements has been extended, allowing developers to write cleaner type and value checks for types like `int` and `boolean`.

The API for structured concurrency has been refined, treating groups of related tasks running in different threads as single units of work, which streamlines error handling and cancellation.

A new API provides the ability to defer initialization of immutable data until it is actually needed, combining the performance benefits of final fields with lazy initialization.

The Vector API continues to improve support for high-performance mathematical operations, allowing developers to leverage modern CPU vector capabilities more effectively.

G1 is now the default garbage collector across all environments, providing more consistent performance and predictable pause times for applications.

The release reduces the memory footprint of Java objects by enabling smaller object headers, leading to improved memory efficiency and cache utilization.