Java 21 is here, packed with new features and enhancements that can boost your development workflow. If you’re eager to try it out, SDKMAN (The Software Development Kit Manager) is a fantastic tool to simplify the installation and management of multiple Java versions on your system.

Why SDKMAN?

• Multiple Versions: SDKMAN allows you to effortlessly switch between different Java versions, which is essential for working on various projects with varying requirements.
• Easy Installation: The installation process is straightforward and streamlined.
• Command-Line Interface: SDKMAN’s intuitive CLI makes managing Java versions a breeze.
• Cross-Platform: Works seamlessly on macOS, Linux, and Windows (using WSL).

Let’s Get Started

1. Installation

Open your terminal and run the following command:

Bash

curl -s "https://get.sdkman.io" | bash

Follow the on-screen instructions to complete the installation. After installing, close and reopen your terminal, or run:

Bash

source "$HOME/.sdkman/bin/sdkman-init.sh"

2. Verify Installation

To ensure SDKMAN is installed correctly, run:

Bash

sdk version

You should see the SDKMAN version information.

3. Install Java 21

First, check the available Java 21 versions:

Bash

sdk list java

Locate the Java 21 version you want (e.g., 21.0.3-tem) and install it:

Bash

sdk install java 21.0.3-tem

(Substitute the exact version if it differs.)

4. Make Java 21 the Default

Bash

sdk default java 21.0.3-tem

5. Verify Your Java Version

Bash

java -version

You should see the output indicating Java 21 is now your active version.

Bonus Tip: Working with Projects

SDKMAN allows you to set a specific Java version for each of your projects. Navigate to your project’s directory and run:

Bash

sdk use java <version>

Use code with caution.content_copy

This ensures your project always uses the correct Java version, preventing compatibility issues.

Troubleshooting

• “Command not found”: Ensure you’ve closed and reopened your terminal after installation or sourced the sdkman-init.sh file as shown above.
• Installation Issues: Check your internet connection and try again. If problems persist, consult the SDKMAN documentation or community forums for assistance.

Let me know if you’d like any additions or refinements to this tutorial. Happy coding with Java 21!