After several days of troubleshooting, I successfully installed Java 11 on my Raspberry Pi 4B running CentOS 8. Here’s my journey and the solution I found, which I hope can help others facing similar challenges.Problem Background I upgraded my Raspberry Pi 3B to a 4B with the goal of running OpenHAB for enhanced home automation. However, installing Java 11 proved to be a hurdle. The official repositories didn’t support ARM64 versions of Java 11, and manual installations were tricky.Challenges Faced 1. Repository Limitations: CentOS 8 repositories only supported Java versions 15, 16, and 17 for ARM64, which were too recent for my needs. 2. Manual Installation Hiccups: Downloading Zulu Java 11 for ARM32HF and ARM32SF from manual sources didn’t match checksums, causing initial confusion. 3. Decompression Issues: Extracting the downloaded .tar files without .gz extensions was a puzzle, but using gzip resolved this. Solution Steps 1. Download the Correct JDK: I found that the ARM32HF version was compatible with my Raspberry Pi 4B. 2. Transfer and Decompress: Using SFTP, I transferred the JDK to my Pi and decompressed it with tar -xzvf. 3. Set Environment Variables: Added the JDK bin directory to PATH and set JAVA_HOME to point to the JDK installation. 4. Verify Installation: Running java -version confirmed the installation was successful.Outcome With Java 11 installed, my Raspberry Pi 4B is now ready to run OpenHAB smoothly. This setup has significantly improved my home automation experience, and I’m excited to explore more features.Final Thoughts While the process was a bit daunting, it taught me valuable troubleshooting skills. Kudos to the OpenHAB community for their robust documentation and support! If anyone needs further assistance, feel free to reach out. Happy automating! 