Installing Java 25 Option 1: SDKMAN! (Recommended) SDKMAN! is the easiest way to install and switch between Java versions on macOS and Linux. # Install SDKMAN! if you don't have it curl -s "https://get.sdkman.io" | bash source "$HOME/.sdkman/bin/sdkman-init.sh" # List available Java 25 distributions sdk list java | grep "25" # Install Eclipse Temurin 25 (open-source, most common) sdk install java 25-tem # Set as default globally sdk default java 25-tem # Verify java -version # openjdk version "25" 2025-09-16 Switch between versions per project:

Note: JEP 505 is a preview feature in Java 25 (5th preview). Enable with --enable-preview. The API has been stable for several rounds and is expected to finalize in Java 26. The Problem with Unstructured Concurrency Classic Java concurrency with ExecutorService is unstructured: you submit tasks, and those tasks have no formal relationship with the code that submitted them. This causes three recurring problems: Problem 1: Partial failure leaves orphaned tasks ExecutorService exec = Executors.