17 Linux - Java

wget -qO - https://packages.adoptium.net/artifactory/api/gpg/key/public | sudo apt-key add - echo "deb https://packages.adoptium.net/artifactory/deb $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/adoptium.list sudo apt update sudo apt install temurin-17-jdk # Fedora / RHEL 9+ with dnf sudo dnf install java-17-openjdk-devel Older RHEL/CentOS 7 with yum sudo yum install java-17-openjdk-devel Amazon Linux 2023 (Corretto) sudo dnf install java-17-amazon-corretto-devel Arch Linux (pacman) sudo pacman -S jdk17-openjdk # Manage multiple Java versions sudo archlinux-java set java-17-openjdk Alpine Linux (For Containers) FROM alpine:3.19 RUN apk add openjdk17 --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community Step 3: Managing Multiple Java Versions (The Linux Way) Most Linux servers run multiple JVMs. Use update-alternatives (Debian/Ubuntu) or manual symlinks (RHEL).

curl -s "https://get.sdkman.io" | bash source "$HOME/.sdkman/bin/sdkman-init.sh" sdk install java 17.0.10-tem sdk default java 17.0.10-tem The Linux kernel behaves differently than macOS or Windows. Here are three critical JVM flags for production: 1. Use -XX:+UseContainerSupport (Enabled by default in Java 17) Java 17 correctly detects cgroup v1 and v2 memory limits. Do not set -Xmx manually unless you understand the heap. 2. Set -XX:ActiveProcessorCount On shared Linux servers, the JVM may see all host CPUs. Limit it: java 17 linux

For the most up-to-date builds:

[Unit] Description=My Java 17 Application After=network.target [Service] Type=simple User=myappuser Group=myappuser Environment="JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64" Environment="APP_OPTS=-Xms512m -Xmx2g" ExecStart=$JAVA_HOME/bin/java $APP_OPTS -jar /opt/myapp/app.jar Restart=on-failure RestartSec=10 wget -qO - https://packages

| Distribution | Best For | Package Manager Availability | | :--- | :--- | :--- | | | General purpose, cloud-native, CI/CD | apt , yum , dnf (via Adoptium repo) | | Oracle OpenJDK | Oracle Linux & strict Oracle support contracts | yum (Oracle Linux) | | Amazon Corretto 17 | AWS environments, long-term free patches | yum , apt , dnf | | Azul Zulu 17 | Legacy hardware or embedded Linux | apt , yum , tgz | Recommendation: For 95% of users, use Eclipse Adoptium (Temurin) or Amazon Corretto . Both offer free, long-term support without licensing headaches. Step 2: Installing Java 17 on Major Linux Distributions Ubuntu / Debian (apt) # Update package list sudo apt update Install the default Java 17 JDK (OpenJDK) sudo apt install openjdk-17-jdk -y Verify installation java -version Here are three critical JVM flags for production: 1

Then:

# List all installed Java versions sudo update-alternatives --config java echo "export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64" | sudo tee -a /etc/environment source /etc/environment