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# System aktualisieren sudo apt update && sudo apt upgrade # Zertifikate installieren sudo apt install curl gnupg ca-certificates curl -s https://repos.azul.com/azul-repo.key | sudo gpg --dearmor -o /usr/share/keyrings/azul.gpg # Repo für Raspi 4 mit 64-Bit hinzufügen echo "deb [arch=arm64 signed-by=/usr/share/keyrings/azul.gpg] https://repos.azul.com/zulu/deb stable main" | sudo tee /etc/apt/sources.list.d/zulu.list sudo apt update sudo apt install zulu21-jdk-headless # Check: java --version # Ergebnis: openjdk 21.0.9 2025-10-21 LTS OpenJDK Runtime Environment Zulu21.46+19-CA (build 21.0.9+10-LTS) OpenJDK 64-Bit Server VM Zulu21.46+19-CA (build 21.0.9+10-LTS, mixed mode, sharing) |