I was successfully able to specify Java version per server by following instructions from fegkay15 here: https://github.com/hexparrot/mineos-node/issues/396#issuecomment-859964111   Basically, edit the "server.config" file for each server, and add a line right under the [java] heading: java_binary=/usr/lib/jvm/java-16-openjdk/bin/java Change 16 to 11 if needed. restart the minecraft server after saving file. This is the location of the java binary for me. since this
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