我最近开始制作插件。我想创建一个插件，该插件将说“ xyz Player已加入/离开”和死亡消息。它适合加入并通过消灭不是玩家的实体而很好地工作。但是当Player杀死另一个Player时，控制台会返回它无法传递PlayerDeathEvent。
我尝试了谷歌搜索问题，但是之前的问题都没有帮助我解决地雷问题
控制台错误
[12:39:35] [Server thread/ERROR]: Could not pass event PlayerDeathEvent to Introduce v1.0
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:529) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:726) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityPlayer.die(EntityPlayer.java:520) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityLiving.damageEntity(EntityLiving.java:1169) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityHuman.damageEntity(EntityHuman.java:769) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityPlayer.damageEntity(EntityPlayer.java:675) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityHuman.attack(EntityHuman.java:1018) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.EntityPlayer.attack(EntityPlayer.java:1536) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1864) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PacketPlayInUseEntity.a(SourceFile:69) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PacketPlayInUseEntity.a(SourceFile:13) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:910) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:903) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:887) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:820) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.NullPointerException
at JoinMessage.JoinMessage.onPlayerDeath(JoinMessage.java:54) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_211]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_211]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_211]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_211]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
... 24 more
Main.java：
package me.GraczBezNicku.Introduction;
import org.bukkit.plugin.java.JavaPlugin;
import JoinMessage.JoinMessage;
public class Main extends JavaPlugin
{
@Override
public void onEnable()
{
saveDefaultConfig();
new JoinMessage(this);
}
}
Utility.java（用于简化聊天室的获取）：
package Utilities;
import org.bukkit.ChatColor;
public class utility {
public static String chat (String s)
{
return ChatColor.translateAlternateColorCodes('&', s);
}
}
JoinMessage.java（我不认为我会将它用于死亡消息）：
package JoinMessage;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.PlayerDeathEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import Utilities.utility;
import me.GraczBezNicku.Introduction.Main;
public class JoinMessage implements Listener
{
private static Main plugin;
public JoinMessage(Main plugin)
{
this.plugin = plugin;
Bukkit.getPluginManager().registerEvents(this, plugin);
}
@EventHandler
public void onJoin(PlayerJoinEvent e)
{
Player p = e.getPlayer();
if(!p.hasPlayedBefore())
{
Bukkit.broadcastMessage(utility.chat(plugin.getConfig().getString("firstjoin_message").replace("<player>", p.getName())));
}
else
{
Bukkit.broadcastMessage(utility.chat(plugin.getConfig().getString("join_message").replace("<player>", p.getName())));
}
}
@EventHandler
public void onExit(PlayerQuitEvent e)
{
Player p = e.getPlayer();
Bukkit.broadcastMessage(utility.chat(plugin.getConfig().getString("leave_message").replace("<player>", p.getName())));
}
@EventHandler
public void onPlayerDeath(PlayerDeathEvent e)
{
if(e.getEntity().getKiller() instanceof Player)
{
PlayerDeathEvent deathe = null;
deathe.setDeathMessage(null);
Player p = e.getEntity();
Player killer = e.getEntity().getKiller();
if(p != killer)
{
killer.sendMessage(utility.chat("You have killed &7" + p.getDisplayName() + "!"));
p.sendMessage(utility.chat("You have been killed by &7" + killer.getDisplayName()+ "!"));
Bukkit.broadcastMessage(utility.chat("&7" + p.getDisplayName() + " Was killed by &7" + killer.getDisplayName()));
}
else if(killer == p)
{
Bukkit.broadcastMessage(utility.chat(" &7" + p.getDisplayName() + " Killed Himself!"));
}
}
else
{
Player p = e.getEntity();
Bukkit.broadcastMessage(utility.chat("&7" + p.getDisplayName() + " has died."));
}
}
}
config.yml：
firstJoin_message: '&a<player> &7has joined the server for the first time!'
join_message: '&e<player> &7has joined the server!'
leave_message: '&e<player> &7has left the server.'
plugin.yml：
name: Introduce
version: 1.0
author: GraczBezNicku
main: me.GraczBezNicku.Introduction.Main
description: Join/Leave message
预期结果是：“玩家xyz杀死zyx”。 实际结果：无法通过PlayerDeathEvent。
请寻求帮助，感谢您阅读本文！ ; ）
答案 0 :(得分：0)
我很容易地使NullPointerException倍增。删除deathe.setdeathmessage（null）时，它可以工作！
PlayerDeathEvent deathe = null;
它应该看起来像这样；
不是这个：
PlayerDeathEvent deathe = null;
deathe.setDeathMessage(null);