Java 17 - Linux !free!

java -XX:ActiveProcessorCount=2 -jar myapp.jar For large heaps (>8GB), tell the JVM to use Linux's THP:

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

| 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 java -XX:ActiveProcessorCount=2 -jar myapp