Just essentials results in the following being spammed to console:
29.05 12:03:27 [Server] INFO You are not a player!
29.05 12:03:57 [Server] INFO You are not a player!
29.05 12:04:27 [Server] INFO You are not a player!
29.05 12:04:58 [Server] INFO You are not a player!
29.05 12:05:28 [Server] INFO You are not a player!
29.05 12:05:58 [Server] INFO You are not a player!
29.05 12:06:29 [Server] INFO You are not a player!
29.05 12:06:59 [Server] INFO You are not a player!
29.05 12:07:29 [Server] INFO You are not a player!
Is your console set to automatically run commands? Those messages are only generated when a command is run from the Just Essentials plugin, and it cannot be from console.
Just essentials results in the following being spammed to console:
29.05 12:03:27 [Server] INFO You are not a player! 29.05 12:03:57 [Server] INFO You are not a player! 29.05 12:04:27 [Server] INFO You are not a player! 29.05 12:04:58 [Server] INFO You are not a player! 29.05 12:05:28 [Server] INFO You are not a player! 29.05 12:05:58 [Server] INFO You are not a player! 29.05 12:06:29 [Server] INFO You are not a player! 29.05 12:06:59 [Server] INFO You are not a player! 29.05 12:07:29 [Server] INFO You are not a player!