Java 27 brings several enhancements to the Java Development Kit (JDK). The release includes Project Loom improvements, specifically offering preview support for virtual threads in the `java.util.concurrent.locks` package. This update aims to simplify concurrent programming by enabling developers to write high-throughput concurrent applications using familiar lock constructs, without the complexity of managing low-level thread pools.

Another significant addition is the preview of a new Foreign Function & Memory API (FFM API). This API provides a more robust and performant alternative to the Java Native Interface (JNI) for interacting with native code and memory outside the Java heap. It offers better safety and efficiency for use cases requiring native library integration.

The release also features enhancements to the Java Flight Recorder (JFR), improving its capabilities for low-overhead diagnostic profiling. These updates collectively focus on improving developer productivity, performance, and the ability to build scalable, modern applications within the Java ecosystem.