A force op/backdoor Minecraft plugin which can be used to get OP on a Minecraft server.
Put the .jar file to the plugins folder of the server. If you're trying to build from source then make sure to add spigot-api jar file as a depedency, here is the api link: https://hub.spigotmc.org/nexus/content/repositories/snapshots/org/spigotmc/spigot-api/