"For Java, the latest one. Current latest java still runs 20 year old jars." Not necessarily anymore. Many of the standard JVM features were removed in 11+ ins

"For Java, the latest one. Current latest java still runs 20 year old jars." Not necessarily anymore. Many of the standard JVM features were removed in 11+ instances, so things like _some_ of the JVMs JMX APIs were removed for one reason or other. I'm not saying the removals weren't justified, simply clarifying that not all java applications written N years ago are still entirely supported.