If you're on pre-Java 8u191, containers will see host memory. Use -XX:InitialRAMPercentage and -XX:MaxRAMPercentage to fix. 3. Backport Modern APIs (Without Upgrading the JDK) You don't need Java 17 to write cleaner code. Use these backported libraries:

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Your goal isn’t to rewrite everything in the latest version. Your goal is to keep the system secure, performant, and maintainable until you’re ready to move.