这是失败代码：
[18:54:41] [Server thread/INFO]: LonghornHD_TV_YT issued server command: /switch
[18:54:41] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'switch' in plugin DerMariosServer-Lobby v1.5.5
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-550ebac-7019900]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-550ebac-7019900]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-550ebac-7019900]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_101]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_101]
at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:696) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634) [spigot.jar:git-Spigot-550ebac-7019900]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537) [spigot.jar:git-Spigot-550ebac-7019900]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_101]
Caused by: java.lang.NullPointerException
at Main.main.switch_mode_if(main.java:253) ~[?:?]
at Commands.commands.onCommand(commands.java:96) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-550ebac-7019900]
... 14 more
以下是命令类的代码：
if(cmd.getName().equalsIgnoreCase("switch")){
if(sender instanceof Player){
final Player p = (Player) sender;
if(p.hasPermission("DerMarios.Lobby.Mode.Switch")){
if(plugin.switch_mode_if(p)){
p.sendMessage(prefix + "§6Du gehst jetzt in den Normal Mode.");
Bukkit.getScheduler().scheduleAsyncDelayedTask(plugin, new Runnable() {
@Override
public void run() {
plugin.switch_mode(p);
}
}, 40);
return true;
}else{
p.sendMessage(prefix + "§6Du gehst jetzt in den Bau Mode.");
Bukkit.getScheduler().scheduleAsyncDelayedTask(plugin, new Runnable() {
@Override
public void run() {
plugin.switch_mode(p);
}
}, 40);
return true;
}
}else{
p.sendMessage(prefix + "§6Du hast keine Permissions!");
return true;
}
}else{
ConsoleCommandSender co = plugin.getServer().getConsoleSender();
co.sendMessage(prefix + "§4Der Befehl kann nur ingame ausgeführt werden!");
return true;
}
以下是主类的代码：
package Main;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
//import Extra.oldoldNick;
import Extra.oldNick;
import Extra.TPS;
import Commands.commands;
import Items.items;
import Listener.listener_main;
import net.minecraft.server.v1_8_R1.ChatSerializer;
import net.minecraft.server.v1_8_R1.IChatBaseComponent;
import net.minecraft.server.v1_8_R1.PacketPlayOutChat;
import net.minecraft.server.v1_8_R1.PlayerConnection;
public class main extends JavaPlugin implements Listener{
private String prefix = "§8[§6System§8] ";
private static main inst;
private ConsoleCommandSender co = getServer().getConsoleSender();
public HashMap<String, String> nick = new HashMap<String, String>();
public ArrayList<String> nonicks = new ArrayList<String>();
public ArrayList<String> nicks = new ArrayList<String>();
public static ArrayList<String> doublejump = new ArrayList<String>();
private ArrayList<Player> switch_mode = new ArrayList<Player>();
// private static float defaultSpeed = 0.2f;
public void onLoad(){
co.sendMessage(prefix + "Das LobbyPlugin wurde geladen");
}
@SuppressWarnings("unchecked")
public void onEnable(){
File mk = new File("plugins//DerMarios//Lobby");
final File data = new File("plugins//DerMarios//Lobby//data.yml");
File data2 = new File("plugins//DerMarios//nick_names.yml");
commands cm = new commands(this);
getCommand("gmc").setExecutor(cm);
getCommand("check").setExecutor(cm);
getCommand("nick").setExecutor(cm);
getCommand("farben").setExecutor(cm);
getCommand("zeichen").setExecutor(cm);
getCommand("ping").setExecutor(cm);
getCommand("switch").setExecutor(cm);
if(!(mk.mkdir())){
mk.mkdirs();
}
if(!(data.exists())){
try {
data.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
if(!(data2.exists())){
try {
data2.createNewFile();
} catch(IOException e){
e.printStackTrace();
}
}
new oldNick(this);
FileConfiguration cg = YamlConfiguration.loadConfiguration(data);
FileConfiguration cg2 = YamlConfiguration.loadConfiguration(data2);
nonicks.add("GommeHD");
nonicks.add("ungespielt");
nonicks.add("LonghornHD_TV_YT");
nonicks.add("PasMinecrafter");
nonicks.add("DerMarios");
nonicks.add("LonghornHD");
if(cg2.contains("Nicks")){
nicks = (ArrayList<String>) cg2.getList("Nicks");
}else{
nicks.add("Bruiser");
nicks.add("Punisher");
nicks.add("Heavy Hands");
nicks.add("Knock Out");
nicks.add("Studd");
nicks.add("Punk");
nicks.add("Wild Thing");
nicks.add("Superhuman");
nicks.add("Disgusting");
nicks.add("Filthy");
nicks.add("Dangerous");
nicks.add("Desiel");
nicks.add("Strong");
nicks.add("Amazing");
nicks.add("Excellent");
nicks.add("Big Bang");
nicks.add("Ankle Breaker");
nicks.add("The Freak");
nicks.add("Riot Boy");
nicks.add("Killer");
nicks.add("Super Human");
nicks.add("The Amazon");
nicks.add("Beautiful");
nicks.add("El Diablo");
nicks.add("Snow Man");
nicks.add("Hopeless");
nicks.add("Renegade");
nicks.add("Blue Print");
nicks.add("The Ruler");
nicks.add("Friend or Foe");
nicks.add("The Prisident");
nicks.add("The Politican");
nicks.add("Cupid");
nicks.add("The Jokester");
nicks.add("The Chokester");
nicks.add("Bone Snapper");
nicks.add("The Dentist");
nicks.add("TheBoneRealing");
nicks.add("Emotionless");
nicks.add("The Bloody");
nicks.add("Famous");
nicks.add("Rich");
nicks.add("Street Chemist");
nicks.add("The Ghost");
nicks.add("The Battler");
nicks.add("TheCigarSmoker");
nicks.add("Sugar");
nicks.add("The Dancer");
nicks.add("Moon Walker");
nicks.add("Grown Up");
nicks.add("Shorty");
nicks.add("Fast and Lound");
nicks.add("The Strom");
nicks.add("End of the Line");
cg2.set("Nicks", nicks);
try {
cg2.save(data2);
} catch (IOException e) {
e.printStackTrace();
}
}
if(cg.contains("No-Nicks")){
nonicks = (ArrayList<String>) cg.getList("No-Nicks");
}
cg.set("No-Nicks", nonicks);
try {
cg.save(data);
} catch (IOException e1) {
e1.printStackTrace();
}
Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new TPS(), 0L, 1L);
co.sendMessage(prefix + "§eDas LobbyPlugin wurde erfolgreich geladen!");
new listener_main(this);
new items(this);
new oldNick(this);
Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
@Override
public void run() {
for(Player OnlinePlayer : Bukkit.getOnlinePlayers()){
FileConfiguration cfg = YamlConfiguration.loadConfiguration(data);
if(cfg.contains("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.TimeEnd")){
long current = System.currentTimeMillis();
long End = cfg.getLong("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.TimeEnd");
long Test = End-current;
if(Test <= 0){
String Traget = cfg.getString("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.Target");
if(Bukkit.getPlayer(Traget) != null){
Player T = Bukkit.getPlayer(Traget);
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.You", null);
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.Target", null);
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.TimeEnd", null);
OnlinePlayer.sendMessage(prefix + "§6Die Zeit ist um! Die Anfrage wurde abgebrochen!");
T.sendMessage(prefix + "§6Die Zeit ist um! Du hattes Zeit um die Anfrage anzunehmen oder abzulehenen!");
try {
cfg.save(data);
} catch (IOException e) {
e.printStackTrace();
}
return;
}else{
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.You", null);
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.Target", null);
cfg.set("Freunde." + OnlinePlayer.getUniqueId() + ".Anfrage.TimeEnd", null);
OnlinePlayer.sendMessage(prefix + "§6Die Anfrage wurde abgebrochen!");
try {
cfg.save(data);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
}, 1, 1);
}
public void onDisable(){
co.sendMessage(prefix + "Das LobbyPlugin wurde erfolgreich beendet!");
}
public void sendActionBar(Player p, String m){
if(m == null) m = "";
m = ChatColor.translateAlternateColorCodes('&', m);
m = m.replaceAll("%PLAYER%", p.getDisplayName());
PlayerConnection con = ((CraftPlayer)p).getHandle().playerConnection;
IChatBaseComponent chat = ChatSerializer.a("{\"text\": \"" + m + "\"}");
PacketPlayOutChat packet = new PacketPlayOutChat(chat,(byte) 2);
con.sendPacket(packet);
}
public static void setUltraSpeed(Player p){
p.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, Integer.MAX_VALUE, 3));
}
public static void setSchnellerSpeed(Player p){
p.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, Integer.MAX_VALUE, 2));
}
public static void setSchnellSpeed(Player p){
p.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, Integer.MAX_VALUE, 1));
}
public static void setNormalSpeed(Player p){
p.removePotionEffect(PotionEffectType.SPEED);
}
public static void switch_mode(Player p){
if(switch_mode_if(p)){
inst.switch_mode(p, false);
}else{
inst.switch_mode(p, true);
}
}
public static boolean switch_mode_if(Player p){
if(inst.switch_mode_code_if(p)){
return true;
}else{
return false;
}
}
public boolean switch_mode_code_if(Player p){
if(switch_mode.contains(p)){
GameMode c = GameMode.CREATIVE;
p.getInventory().clear();
p.setGameMode(c);
return true;
}else{
return false;
}
}
public void switch_mode(Player p, boolean switchmode){
if(switchmode){
switch_mode.add(p);
}else{
switch_mode.remove(p);
}
}
public String getPrefix(){
return prefix;
}
}
如果我运行命令，我会得到错误。 我已经看了两个小时，但遗憾的是什么都没发现。 我希望你能帮助我。
答案 0 :(得分：0)
如果您查看堆栈跟踪，可以看到异常是：
Caused by: java.lang.NullPointerException
at Main.main.switch_mode_if(main.java:253) ~[?:?]
这告诉您方法NullPointerException中有switch_mode_if（第253行）：
public static boolean switch_mode_if(Player p){
if(inst.switch_mode_code_if(p)){
return true;
}else{
return false;
}
在此方法中抛出NullPointerException的唯一方法是inst为空（这种情况）。您会注意到private static main inst;从未初始化（给定值），因此抛出异常。
要解决此问题，请将inst = this;放入方法onEnable()。
如果您知道如何自己阅读堆栈跟踪，您可以自己解决这个问题： java - What is a stack trace, and how can I use it to debug my application errors?