Example usage for ReefMC

example.java

package me.PlayinCOD3142.Reef;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.EventHandler;

public class Reef extends JavaPlugin implements Listener { //Don't use Main as a name. Main is a keyword. Use your plugin name for better conventions.

  @Override
  public void onEnable() {
    getServer().getPluginManager().registerEvents(this, this);
    getLogger().info("rEssentials has been enabled!");
    saveDefaultConfig(); //Only saves it if there is no existing config
  }

  @Override
  public void onDisable() {
    getLogger().info("rEssentials disabled sucessfully!");
  }

  public boolean onCommand(CommandSender sender, Command cmd, String CommandLabel, String[] args) {
    if(sender instanceof Player) {
      Player p = (Player)sender;
      if (cmd.getName().equalsIgnoreCase("reef")) {
        CommandSender player = (Player)sender;
        player.sendMessage(ChatColor.DARK_GRAY + "-=[ReefMC]=-");
        player.sendMessage(ChatColor.GRAY + "-");
        player.sendMessage(ChatColor.GRAY + "-");
        player.sendMessage(ChatColor.GRAY + "-");
      }
      if (CommandLabel.equalsIgnoreCase("fly")) {
        if (!p.isFlying()) {
          p.setAllowFlight(true);
          p.sendMessage(ChatColor.GRAY + "Fly enabled.");
        } else {
      	  p.setAllowFlight(false);
          p.sendMessage(ChatColor.GRAY + "Fly disabled.");
        }
      }
    } else {
      sender.sendMessage("You must be a player to do this!");
    }
    return false;
  }
  
  @EventHandler
  public void onPlayerJoin(PlayerJoinEvent e) {
    Player p = e.getPlayer();
    //online.add(p); //have you defined online? no. Don't use it if it's not defined
    //} //this closes your onPlayerJoin. Bad.
    p.sendMessage(ChatColor.AQUA + "Welcome to the ReefMc Network.");
    p.sendMessage(ChatColor.AQUA + "Click you compass to find a server.");
    p.sendMessage(ChatColor.AQUA + "Website: " + ChatColor.GRAY + "www.reefmc.com");
    p.sendMessage(ChatColor.AQUA + "Donate: " + ChatColor.GRAY + "www.reefmc.buycraft.com");
  }
}