Depending on where you found your initial tutorial, or if you have searched this forum,
you may or may not be aware that… as of recent Local Server changes, there is now support for Java 9… however due to some incompatibilities with some hardware, there is now both Java options. So depending on what version you download you adjust your rc.local accordingly.
Newer Java 9 option…
server-0.30.0.jar <— Note, referencing latest Server version 0.30.0
…or the “older” Java 8 option.
server-0.30.0-java8.jar <— Note, referencing latest Server version 0.30.0
More details here: