Added README, .gitignore and Project

src/main/java/de/web/basman93/kickplayeronjoin/KickPlayerOnJoin.java

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+package de.web.basman93.kickplayeronjoin;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.Color;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.event.player.PlayerLoginEvent.Result;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class KickPlayerOnJoin extends JavaPlugin implements Listener {
+	
+	private boolean active = true;
+	private FileConfiguration config = getConfig();
+	private List<String> playerlist = new ArrayList<String>();
+	private final String prefix = Color.SILVER + "[K" + Color.GRAY + "P" + Color.SILVER + "OJ] ";
+	
+	@Override
+	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+		if(command.getName().equalsIgnoreCase("kickplayeronjoin")) {
+			
+			if(args.length > 0 && args[0].equalsIgnoreCase("on") && cop(sender, "kpoj.mode")) {
+				sender.sendMessage(prefix + "activated");
+				active = true;
+				save();
+				
+			} else if(args.length > 0 && args[0].equalsIgnoreCase("off") && cop(sender, "kpoj.mode")) {
+				sender.sendMessage(prefix + "deactivated");
+				active = false;
+				save();
+				
+			} else if(args.length > 0 && args[0].equalsIgnoreCase("help") && cop(sender, "kpoj.help")) {
+				sender.sendMessage(prefix + "--------------- HELP ---------------");
+				sender.sendMessage(prefix + "/kpoj      - shows version & status");
+				sender.sendMessage(prefix + "/kpoj help - shows this help info");
+				sender.sendMessage(prefix + "/kpoj off  - deactivate this plugin");
+				sender.sendMessage(prefix + "/kpoj on   - activate this plugin");
+				sender.sendMessage(prefix + "------------------------------------");
+				
+			} else if(args.length > 1 && args[0].equalsIgnoreCase("add") && cop(sender, "kpoj.add")) {
+				for(int i = 1; i < args.length; i++) {
+					if(playerlist.contains(args[i])) {
+						sender.sendMessage(prefix + args[i] + " is already in the whitelist!");
+					} else {
+						playerlist.add(args[i]);
+						sender.sendMessage(prefix + args[i] + " add to whitelist!");
+					}
+				}
+				save();
+				
+			} else if(args.length > 1 && args[0].equalsIgnoreCase("del") && cop(sender, "kpoj.del")) {
+				for(int i = 1; i < args.length; i++) {
+					if(playerlist.contains(args[i])) {
+						playerlist.remove(args[i]);
+						sender.sendMessage(prefix + args[i] + " removed from the whitelist!");
+					} else {
+						sender.sendMessage(prefix + args[i] + " is not in the whitelist!");
+					}
+				}
+				save();
+				
+			} else if(args.length > 0 && args[0].equalsIgnoreCase("reload") && cop(sender, "kpoj.reload")) {
+				reloadConfig();
+				
+				config = getConfig();
+				
+				playerlist = config.getStringList("Player");
+				active = config.getBoolean("Check");
+				
+			} else if(args.length > 0 && args[0].equalsIgnoreCase("list") && cop(sender, "kpoj.list")) {
+				String buffer = playerlist.isEmpty() ? "" : playerlist.get(0);
+				for(int i = 1; i < playerlist.size(); i++) {
+					buffer += ", " + playerlist.get(i);
+				}
+				sender.sendMessage(prefix + "Players: " + buffer);
+				
+			} else {
+				sender.sendMessage(prefix + "Version: " + getDescription().getVersion());
+				if(cop(sender, "kpoj.info"))
+					sender.sendMessage(prefix + "Active:  " + (active ? Color.GREEN + "yes" : Color.RED + "no"));
+				if(sender.hasPermission("kpoj.info") && sender instanceof Player)
+					sender.sendMessage(prefix + "Status:  " + (playerlist.contains(sender.getName()) ? Color.GREEN + "Allowed" : Color.RED + "Disallowed"));
+			}
+			return true;
+		}
+		return false;
+	}
+	
+	@Override
+    public void onEnable() {
+		saveDefaultConfig();
+		
+		playerlist = config.getStringList("Player");
+		active = config.getBoolean("Check");
+		
+		getServer().getPluginManager().registerEvents(this, this);
+    }
+	
+    @EventHandler
+    public void onPlayerLogin(PlayerLoginEvent event) {
+    	if(!playerlist.contains(event.getPlayer().getName()) && active) {
+    		event.disallow(Result.KICK_WHITELIST, "You are not whitelisted on this server!");
+    		getServer().broadcastMessage(event.getPlayer().getName());
+    	}
+    }
+    
+    private boolean cop(CommandSender sender, String perm) {
+    	return sender.hasPermission(perm) || !(sender instanceof Player);
+    }
+    
+    private void save() {
+    	config.set("Check", active);
+    	config.set("Player", playerlist);
+		saveConfig();
+    }
+}

src/main/resources/config.yml

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+Check: true
+Player: []

src/main/resources/plugin.yml

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+name: KickPlayerOnJoin
+main: de.web.basman93.KickPlayerOnJoin
+version: "${project.version}"
+description: A plugin to kick not whitelisted player
+author: basman93
+
+commands:
+  kickplayeronjoin:
+    description: Main Command
+    usage: /<command> <args>
+    aliases: [kpoj]
+    
+permissions:
+  kpoj.*:
+    default: false
+    description: Gives access to all KickPlayerOnJoin commands
+    children:
+      kpoj.mode: true
+      kpoj.help: true
+      kpoj.info: true
+      kpoj.add: true
+      kpoj.del: true
+      kpoj.reload: true
+      kpoj.list: true
+  kpoj.mode:
+    default: false
+    description: Allows to activate or deactivate this plugin
+  kpoj.help:
+    default: false
+    description: Shows help information
+  kpoj.info:
+    default: false
+    description: Shows extra information
+  kpoj.add:
+    default: false
+    description: Adds player to the whitelist
+  kpoj.del:
+    default: false
+    description: Remove player from the whitelist
+  kpoj.reload:
+    default: false
+    description: reload the config file
+  kpoj.list:
+    default: false
+    description: list all added player