Minecraft插件外部错误

Question

public class CortexTroll extends JavaPlugin {

     @Override
     public void onEnable() {}

     @Override
     public void onDisable() {}

     public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
          if (cmd.getName().equalsIgnoreCase("fakeop")) {
               Player player = (Player) sender;
               Player target = Bukkit.getServer().getPlayer(args[0]);
               if (args.length == 0) {
                    player.sendMessage("Specify a player to Op. /fakeop <target>");
                    return true;
               }
               player.sendMessage("Fake Opped " + args[0]);
               Bukkit.broadcastMessage(ChatColor.GRAY + "[" + player.getName() + ": Opped " + args[0] + "]");
               target.sendMessage(ChatColor.YELLOW + "You are now op!");
          }
          return true;
     }
 }

Illuminatiiiiii发布的服务器命令：/fakeop[21:33:10 ERROR]:null org.bukkit.command.commandexception:未处理的异常在org.bukkit.command.plugincommand.execute(plugincommand.java:46)~[spigot-1.10.2.jar:git-spigot-5391d73-00359a1]在org.bukkit.craftbukkit.dispat(simplecommandmap.java:141)~[spigot-1.10.2.jar:git-spigot.v1_10_r1.craftServer.dispatchCommand(CraftServer.java:646)~[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]在net.minecraft.server.v1_10_r1.playerConnection.handlecommand（playerConnection.javer.v1_10_r1.1351)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]在91D73-00359A1]在net.minecraft.server.v1_10_r1.packetplayinchat.a(Packetplayinchat.java:45)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]在net.minecraft.server.v1_10_r1.packetplayinchat.a（packetplayinchat.a）tplayinchat.java:1)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]在net.minecraft.server.v1_10_r1.playerConnectionUtils$1.run(SourceFile:13)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]在java.util.concurrent.executors$runnableAdapter.call（未知源）[？:1.8.0_91]在java.util.concurrent.futureTask.run（未知源）[？r1.SystemUtils.a(SourceFile:45)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]at net.minecraft.server.v1_10_r1.minecraftServer.d(MinecraftServer.java:733)[spigot-1.10.2.jar:git-spigot-5391D73-00359A1]at net.minecraft.server.v1_10_R1.depidatedServer.d(DepidatedServer.java:399)[spigot-1.10.2.jar:git-spigot net.minecraft.server.v1_10_r1.minecraftServer.c(MinecraftServer.java:672)[spigot-1.10.2.jar:git-spigot-5391d73-00359a1]at net.minecraft.server.v1_10_r1.minecraftServer.run(MinecraftServer.java:571)[spigot-1.10.2.jar:git-spigot-5391d73-00359a1]at java.lang.thread.run（未知来源）[？:1.8.0_91]由:java.lang.ArrayIndexOutOfboundsException:0，在us.thecortex.cortextroll.cortextroll.onCommand(cortextroll.java:29)~[？：？]在org.bukkit.command.plugincommand.execute(plugincommand.java:44)~[spigot-1.10.2.jar:git-spigot-5391d73-00359a1]

Answer 1

因为不允许我注释jet，所以您可以尝试如下：将下面的行移到检查args.length是否为0的if-语句之后

public Class CortexTroll extends JavaPlugin{

     @Override
     public void onEnable() {}

     @Override
     public void onDisable() {}

     public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
          if (cmd.getName().equalsIgnoreCase("fakeop")) {
               Player player = (Player) sender;
               if (args.length == 0) {
                    player.sendMessage("Specify a player to Op. /fakeop <target>");
                    return true;
               }
               Player target = Bukkit.getServer().getPlayer(args[0]); // Is now below the if-statement
               player.sendMessage("Fake Opped " + args[0]);
               Bukkit.broadcastMessage(ChatColor.GRAY + "[" + player.getName() + ": Opped " + args[0] + "]");
               target.sendMessage(ChatColor.YELLOW + "You are now op!");
          }
          return true;
     }
 }

为什么要修复错误？

如果不带任何参数执行/fakeop，args的长度为0。如果尝试访问args[0]，则会得到ArrayIndexOutOfBoundsException，因为它需要一个长度为1的数组。