Java 17 Linux Here
# 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
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
# Check if THP is enabled (should be 'always' or 'madvise') cat /sys/kernel/mm/transparent_hugepage/enabled java -XX:+UseTransparentHugePages -jar app.jar Step 5: Running as a Linux Service (systemd) Do not run Java apps with nohup or & . Use a proper systemd unit. # List all installed Java versions sudo update-alternatives
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). Do not set -Xmx manually unless you understand the heap
