When I'm testing my new plugin an exception keeps getting thrown: java.lang.IllegalArgumentException: Plugin already initialized! Please help! Here's the code:
package me.plugin.example;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.Listener;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.player.PlayerJoinEvent;
public class Main extends JavaPlugin implements Listener {
@Override
public void onEnable() {
getServer().getPluginManager().registerEvents(new Main(), this);
}
@EventHandler
public void onPlayerJoinEvent(PlayerJoinEvent event) {
Player p = event.getPlayer();
event.setJoinMessage(ChatColor.AQUA + p.getPlayerListName() + " has joined the game.");
p.sendMessage(ChatColor.GOLD + "" + ChatColor.BOLD + "Welcome to the server!");
p.setGameMode(GameMode.ADVENTURE);
}
@Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
Player player = (Player) sender;
if (cmd.getName().equalsIgnoreCase("example")) {
player.sendMessage(ChatColor.BOLD + ""+ ChatColor.ITALIC + "Hello! Hope you like to be set on fire. lol :P");
player.setFireTicks(20);
}
return true;
}
@Override
public void onDisable() {
}
} I know that you're only supposed to declare one JavaPlugin class per plugin, which I think I'm doing. But it keeps saying:
java.lang.IllegalArgumentException: Plugin already initialized!
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at me.plugin.example.Main.<init>(Main.java:19) ~[?:?]
at me.plugin.example.Main.onEnable(Main.java:27) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
Caused by: java.lang.IllegalStateException: Initial initialization
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at me.plugin.example.Main.<init>(Main.java:19) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_201]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_201]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_201]
at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_201]
at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_201]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:292) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
... 2 more
I really need to test this plugin to see if it works, and any help would be greatly appreciated! Thank you!
The stacktrace clearly tells where is the problem. What is a stack trace, and how can I use it to debug my application errors?
The error:
java.lang.IllegalArgumentException: Plugin already initialized!
...
Caused by: java.lang.IllegalStateException: Initial initialization
...
at me.plugin.example.Main.<init>(Main.java:19) ~[?:?]
Your code:
@Override
public void onEnable() {
getServer().getPluginManager().registerEvents(new Main(), this);
} //<-- 19th line
And the problem is when you register your event you are creating a new instance of your Main class. So replace new Main()
getServer().getPluginManager().registerEvents(new Main(), this);
with this
getServer().getPluginManager().registerEvents(this, this);
Creepsy
I would really recommend you to put your event handler in a separate class.
Try removing the below line
getServer().getPluginManager().registerEvents(new Main(), this);
and please don't ask your question several times.
PluginAlreadyInitialized error occours when the .jar file contains more than one subclass of JavaPlugin class. Use the JavaPlugin class only once in all plugins from.
来源：https://stackoverflow.com/questions/57202147/java-lang-illegalargumentexception-plugin-already-initialized