With you making a plugin for Minecraft: Java Edition, you could also make plugins for server softwares on Minecraft. For a plugin for PocketMine/PMMP and all spoons of it, I am part of a plugin development team called BoxOfDevs. PM me if your interested.
Hi Dog2puppy,
PocketMine could be very interesting, I agree. We'll keep BoxOfDevs in mind and we might get in touch with you about that. Thanks for the suggestion!