Develop Reference

Server doesn't enable my spigot plugin. (It doesn't even try)

I'm basically making a spigot plugin, for practice.
The server doesn't enable the server, no error in the console. It also no "INFO" for enabling the plugin.
This is my main class
package me.FarrosGaming.SpawnPillager;
import org.bukkit.plugin.java.JavaPlugin;
import me.FarrosGaming.SpawnPillager.commands.PillagerCommand;
public class Main extends JavaPlugin {
#Override
public void onEnable() {
new PillagerCommand(this);
}
#Override
public void onDisable() {
}
}
This is my command class
package me.FarrosGaming.SpawnPillager.commands;
import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import me.FarrosGaming.SpawnPillager.Main;
public class PillagerCommand implements CommandExecutor {
private Main plugin;
public PillagerCommand(Main plugin) {
this.plugin = plugin;
plugin.getCommand("chase").setExecutor(this);
}
#Override
public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
if (!(sender instanceof Player)) {
sender.sendMessage("Only players who can send this command.");
return true;
}
Player player = (Player) sender;
if (player.hasPermission("hello.use")) {
Location location = player.getLocation();
World world = player.getWorld();
for (int i = 0; i < 10; i++) {
world.spawnEntity(location, EntityType.CREEPER);
}
return true;
} else {
player.sendMessage("You do not have a permission to use this command");
}
return false;
}
}
this is my plugin.yml file
name: SpawnPillager
version: 1.0
author: FarrosGaming
description: blabla
main: me.FarrosGaming.SpawnPillager.Main
commands:
chase:
description: Spawn pillager in your location
usage: /chase
Literally, there are no spaces in the plugin.yml
I'm using the newest version of spigot.

make sure you are dropping your plugin's Jar in the right spot, i mean the right server's plugins folder, if you multiple and then reload/ restart your server,
I m telling this coz, me myself, have done this mistake too..

Error: Could not pass event PlayerJoinEvent to Plugin (BUKKIT)

I'm doing a test plugin, and when I log in, it doesn't tell me the login message, but it gives me an error. Here is the log: https://pastebin.com/SyBN5G2k
I looked up in internet but I can't found nothing that helps me.
Can someone help me i need it to make my server!
This the code of the PlayerJoinEvent event :
package com.Test.events;
import org.bukkit.Location;
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.PlayerJoinEvent;
import com.Test.main.MClass;
public class Enter implements Listener{
private MClass plugin;
public Enter(MClass plugin) {
this.plugin = plugin;
}
#EventHandler
public void onEnter(PlayerJoinEvent event) {
Player player = event.getPlayer();
Location spawn = new Location(player.getWorld(), -8, 64, -467.0, -90, 0);
player.teleport(spawn);
FileConfiguration config = plugin.getConfig();
String path = "config.welcome-message";
if(config.getString(path).equals("true")) {
String text = "Config.welcome-message-text";
player.sendMessage(config.getString(text));
}
}
}
And this my main class (called MClass)
package com.Test.main;
import java.io.File;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import com.Test.commands.CommandPotatoes;
import com.Test.commands.PrincipalCommand;
import com.Test.events.Enter;
public class MClass extends JavaPlugin{
public String configPath;
PluginDescriptionFile pdffile = getDescription();
//Declaration on variables thas include info of the version and the name
public String name = ChatColor.GOLD+""+ChatColor.BOLD+"["+pdffile.getName()+"] "+ChatColor.RESET;
public String version = pdffile.getVersion();
//Instruction on enable plugin
public void onEnable() {
//Mensaje de la consola que indica que el plugin ha sido activado
Bukkit.getConsoleSender().sendMessage(name+ChatColor.BLUE+"Sucesfully loaded (ver "+version+")");
registerCommands();
registerEvents();
registerConfig();
}
public void registerCommands() {
this.getCommand("potatoes").setExecutor(new CommandPotatoes(this));
this.getCommand("test").setExecutor(new PrincipalCommand(this));
}
public void registerEvents() {
PluginManager pm = getServer().getPluginManager();
pm.registerEvents(new Enter(this), this);
}
public void registerConfig() {
File config = new File(this.getDataFolder(),"config.yml");
configPath = config.getPath();
if(!config.exists()) {
this.getConfig().options().copyDefaults(true);
saveConfig();
}
}
}
Plz help i need it to make my server :(

This is what you are looking for:
Caused by: java.lang.NullPointerException
at com.Test.events.Enter.onEnter(Enter.java:27) ~[?:?]
Line #27 would be if(config.getString(path).equals("true"))
Check whether there is indeed a string at that path, meaning
config:
welcome-message: true
as a side note, you should use boolean types for truth values, not strings.

Player Chat event in minecraft java plugin doesnt do what its suposed to do

So I have coded the following code:
package com.ste999.firstplugin;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.event.player.AsyncPlayerChatEvent;
public class Main extends JavaPlugin {
public Main() {}
#Override
public void onEnable() {
getLogger().info("Stefan's first plugin enabled");
}
private volatile boolean chatEnabled = true;
#EventHandler
public void onPlayerChat(AsyncPlayerChatEvent event) {
Player pli = event.getPlayer();
if (!chatEnabled) {
if (!pli.hasPermission("ste.chat.bypass")) {
pli.sendMessage("§4Chat is disabled!");
event.setCancelled(true);
//return true;
}
}
}
#Override
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args)
{
Player p = (Player)sender;
if (cmd.getName().equalsIgnoreCase("mutechat")) {
chatEnabled = !chatEnabled;
sender.sendMessage(chatEnabled ? "§aUnmuted the chat" : "§aMuted the chat");
return true;
}
return true;
}
#Override
public void onDisable() {
getLogger().info("Stefan's first plugin disabled");
}
}
with the following plugin.yml:
name: Stefans_Helper
main: com.ste999.firstplugin.Main
version: 1.0
load: startup
description: this is my first plugin
commands:
mutechat:
description: mute the chat
usage: /<command>
When I use this plugin in my Minecraft server, it shows up and if I do /mutechat it says Muted the chat en when I do /mutechat again it says Unmuted the chat
What I expect this code to do is when the chat is "Muted" no users can talk, unless they have the ste.chat.bypass permission node.
But a user without op and the ste.chat.bypass can still talk in chat after someone did /mutechat and the chat said Muted the chat.
I've tried putting getServer().getPluginManager().registerEvents(this, this); in the public void onEnable but then I get an error in eclipse that says: The method registerEvents(Listener, Plugin) in the type PluginManager is not applicable for the arguments (Main, Main)
Uhh help pls

Your events class (I seriously recommend a new class for this) needs to implement the Listener interface. Only then can you register it.

So I was able to get the mutechat function with the following code:
package com.ste999.events;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
//import org.bukkit.event.EventPriority;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.Listener;
import org.bukkit.plugin.PluginManager;
public class Main extends JavaPlugin implements Listener{
public static boolean chatMuted = false;
#Override
public void onEnable()
{
getLogger().info("events tester enabled!");
PluginManager pm = this.getServer().getPluginManager();
pm.registerEvents(this, (this));
}
#Override
public void onDisable()
{
getLogger().info("events tester disabled!");
}
#Override
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args)
{
Player player = (Player)sender;
if (cmd.getName().equalsIgnoreCase("mutechat")) {
if (player.hasPermission("ste999.chat.mute")) {
if(chatMuted == false) {
Bukkit.broadcastMessage("§aThe chat has been disabled!");
chatMuted = true;
}
else {
if(chatMuted == true) {
Bukkit.broadcastMessage("§aThe chat has been enabled!");
chatMuted = false;
}
}
} else {
if (!player.hasPermission("ste999.chat.mute")) {
player.sendMessage("§4You can't mute the chat silly!");
}
}
}
return false;
}
#EventHandler
public void OnChat(AsyncPlayerChatEvent event)
{
Player pli = event.getPlayer();
if (chatMuted == true) {
if (!pli.hasPermission("ste999.chat.bypass")) {
event.setCancelled(true);
pli.sendMessage("§4The chat has been disabled");
} else {
if (pli.hasPermission("ste999.chat.bypass")) {
event.setCancelled(false);
}
}
}
}
}
I needed to register the events but getServer().getPluginManager().registerEvents(this, this) didn't work for me so I needed to do it the way I did it in the code in onEnable and there where a few other problems

Bukkit Register Commands in Runtime

I am trying to register a bukkit Command on the other Command.
So I want to make "/command1" to register "/command2" so command 2 only can execute after I executed command 1.
I tried for like 10 hours by now to do that, at the moment I am able to register a command without making it into the plugin.yml and that works, just the second command does not get registered.
Main class:
import lombok.Getter;
import org.bukkit.Bukkit;
import org.bukkit.command.CommandMap;
import org.bukkit.plugin.SimplePluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import java.lang.reflect.Field;
public class Main extends JavaPlugin {
#Getter
CommandMap commandMap;
#Override
public void onEnable() {
loadCommandMap();
this.commandMap.register("command1", new FirstCommand(this));
}
private void loadCommandMap() {
try {
if (Bukkit.getPluginManager() instanceof SimplePluginManager) {
Field f = SimplePluginManager.class.getDeclaredField("commandMap");
f.setAccessible(true);
this.commandMap = (CommandMap) f.get(Bukkit.getPluginManager());
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
FirstCommand:
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
public class FirstCommand extends Command {
private Main plugin;
public FirstCommand(Main plugin) {
super("command1");
this.plugin = plugin;
}
#Override
public boolean execute(CommandSender sender, String commandLabel, String[] args) {
plugin.getCommandMap().register("command2", new SecondCommand());
sender.sendMessage("Command 1.");
return true;
}
}
Second Command:
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
public class SecondCommand extends Command {
public SecondCommand() {
super("command2");
}
#Override
public boolean execute(CommandSender sender, String commandLabel, String[] args) {
sender.sendMessage("Command 2");
return true;
}
}
I really hope someone knows why the first command gets registered but the second one does not.

You could try to not register them at runtime, but enable them at runtime.
You can use global, static variables (for example in the main class of your app), e.g.
// in your class "Main"
public static boolean isCommand2Enabled = false;
and when command1 is called, you set it to true
Main.isCommand2Enabled = true;
Your command2 must now only check whether it has already been activated and can be executed:
if(!Main.isCommand2Enabled) {
// I am not activated yet and must return
return false;
}
But I am not quite sure if you might try to define the name of command2 first when command1 is executed (variable command name). You should then maybe use a fixed command and only make the corresponding argument variable.

I don't really understand what you are talking about, but I think this may help you...
Bukkit Tutorial - Registering Commands At Runtime

Bukkit Java error: The method PlayerJoin(OnStartup) is undefined for the type OnStartup

So, I recently started learning Java and BukkitAPI. I make a config file, and I make a class for player events, but then I can't register the events in my main class. I get an error "The method PlayerJoin(OnStartup) is undefined for the type OnStartup" and the only fix is to make a method. Here is my code:
OnStartup(main class):
package ml.zonia.plugin;
import java.io.File;
import java.util.logging.Logger;
import org.bukkit.event.Listener;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import ml.zonia.plugin.commands.Potion;
import ml.zonia.plugin.event.PlayerJoin;
public class OnStartup extends JavaPlugin implements Listener {
public void onEnable() {
registerEvents();
registerConfig();
PluginDescriptionFile pdfFile = getDescription();
Logger logger = getLogger();
getServer().getPluginManager().registerEvents(this, this);
getCommand("zonia").setExecutor(new Potion());
logger.info(pdfFile.getName() + " version " + pdfFile.getVersion() + " has been enabled.");
}
public void registerEvents() {
PluginManager pm = getServer().getPluginManager();
//here is the error on PlayerJoin:The method PlayerJoin(OnStartup) is undefined for the type OnStartup
pm.registerEvents(PlayerJoin(this), this);
}
private void registerConfig() {
getConfig().options().copyDefaults(true);
saveConfig();
}
public void onDisable() {
PluginDescriptionFile pdfFile = getDescription();
Logger logger = getLogger();
logger.info(pdfFile.getName() + " version " + pdfFile.getVersion() + " has been disabled.");
saveConfig();
}
}
Potion Class(Just in case):
package ml.zonia.plugin.commands;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
public class Potion implements CommandExecutor, Listener {
public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
if (label.equalsIgnoreCase("zonia"))
;
if (!(sender instanceof Player)) {
sender.sendMessage("You must be in-game to execute this command.");
return false;
}
Player player = (Player) sender;
player.sendMessage(ChatColor.DARK_AQUA + "ZoniaCore, made by Patrick S.");
return true;
}
}
PlayerJoin:
package ml.zonia.plugin.event;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
import ml.zonia.plugin.OnStartup;
public class PlayerJoin implements Listener {
private OnStartup plugin;
public PlayerJoin(OnStartup pl) {
plugin = pl;
}
#EventHandler
public void onJoin(PlayerJoinEvent pje) {
int PlayerSpeed;
PlayerSpeed = plugin.getConfig().getInt("PlayerSpeed");
if (!pje.getPlayer().hasPermission("zonia.effects.remove"))
;
pje.getPlayer().addPotionEffect(new PotionEffect(PotionEffectType.SPEED, Integer.MAX_VALUE, PlayerSpeed));
}
#EventHandler
public void onPlayerMove(PlayerMoveEvent pme) {
double SpawnX, SpawnY, SpawnZ;
SpawnX = plugin.getConfig().getDouble("SpawnX");
SpawnY = plugin.getConfig().getDouble("SpawnY");
SpawnZ = plugin.getConfig().getDouble("SpawnZ");
if ((int) pme.getPlayer().getLocation().getY() == 20) {
pme.getPlayer().teleport(new Location(Bukkit.getWorld("world"), SpawnX, SpawnY, SpawnZ));
}
}
}
In eclipse, the config yml looks like this:
################################
# #
# ZoniaCore-Hub Config #
# Version 1.0 #
# #
################################
#Sets the player's speed.
PlayerSpeed: 17
#sets X, Y, and Z of spawn.
SpawnX: -67.5
SpawnY: 156
SpawnZ: 4.5
#sets how much the player has to fall
#to be teleported back to spawn.
TeleportY: 50
But when it generates in the plugins folder under the plugin it generates the config like this, and I cant seem to make any changes to it.:
#
# #
# ZoniaCore-Hub Config #
# Version 1.0 #
# #
PlayerSpeed: 6
SpawnX: -67.5
SpawnY: 156
SpawnZ: 4.5
TeleportY: 50

You probably mean:
pm.registerEvents(new PlayerJoin(this), this);
I don't see a PlayerJoin function, only the constructor. BTW it would be a bad practice to start a function name with capital letter, unless it's the constructor.