Solved Commands unhandled exception

Hey guys,

i recently picked up coding again and im kinda new to everything still.
None of my commands really seem to work, any idea why? Thanks!

Code:

public boolean onCommand(CommandSender sender, Command cmd, String label, String [] args){
            Player p = (Player) sender;
            Location ploc = p.getLocation();
            double height2 = p.getLocation().getY();
            double height1 = beginheight.get(p);
            double totalscore = height2 - height1;
            DecimalFormat scoreformat = new DecimalFormat("#,##0.0");
           
           
            ItemStack greenwool = new ItemStack(Material.WOOL, 64, (byte)5 );
            ItemStack brownwool = new ItemStack(Material.WOOL, 64, (byte)12 );
            ItemStack yellowwool = new ItemStack(Material.WOOL, 64, (byte)4 );
            ItemStack redwool = new ItemStack(Material.WOOL, 64, (byte)14 );
            ItemStack helmet = new ItemStack(Material.GOLD_HELMET);
            ItemMeta helmetmeta = helmet.getItemMeta();
           
            Player invite = p.getServer().getPlayer(args[1]);
               
            if(!(sender instanceof Player))
                return false;
           
            if(cmd.getName().equalsIgnoreCase("mdj")){
                if(args.length >= 3){
                    p.sendMessage(ChatColor.DARK_RED+"ERROR: Too many arguments!");
                }
                
                if(args.length == 1){
                     if(args[0].equalsIgnoreCase("start")){
                         start.add(p.getName());
                         p.sendMessage(ChatColor.GREEN + "[" + ChatColor.WHITE + "McDoodleJump" + ChatColor.GREEN + "]" + ChatColor.WHITE + "The game has been started, have fun!" );
                     }
                    
                     if(args[0].equalsIgnoreCase("stop")){
                            start.remove(p.getName());
                            jump.remove(p.getName());
                            p.sendMessage(ChatColor.GREEN + "[" + ChatColor.WHITE + "McDoodleJump" + ChatColor.GREEN + "]" + ChatColor.WHITE + "The game has ended, Your score was:" + ChatColor.ITALIC + scoreformat.format(totalscore));
                     }
                    
                     if(args[0].equalsIgnoreCase("invite") && start.contains(p.getName())){
                         p.sendMessage(ChatColor.DARK_RED + "A man needs a name! try /mdj invite <player>");
                        
                     } else if(args.length == 2)
                        
                     {
                         if(p.getServer().getPlayer(args[1]) != null){
                         invite.teleport(ploc);
                         invite.sendMessage(p.getDisplayName() + " has invited you to the game!");
                         //TODO: Add something to let the invited player choose if he wants to join the game
                         }

                     if(args[0].equalsIgnoreCase("build")){
                         p.sendMessage(ChatColor.DARK_RED + "Error: try /mdj build <on/off>");
                         }
                    
                     } else if(args.length == 2)
                    
                     {
                    
                    
                     if(args[1].equalsIgnoreCase("on")){
                         p.sendMessage("Building Mode = On");
                         p.getInventory().clear();
                         p.updateInventory();
                        
                         p.getInventory().addItem(greenwool);
                         p.getInventory().addItem(brownwool);
                         p.getInventory().addItem(yellowwool);
                         p.getInventory().addItem(redwool);
                       
                         p.getInventory().setHelmet(helmet);
                         helmetmeta.setDisplayName("McDoodleJump Building Helmet");
                         helmet.setItemMeta(helmetmeta);
                     }
                    
                     if(args[1].equalsIgnoreCase("off") && (build.contains(p.getName()))){
                         p.sendMessage("Building Mode = Off");
                         p.getInventory().clear();
                         p.updateInventory();
                     }
                     }
                }
            }
            return true;
        }
}

 

@timtower

Code:

name: McDoodleJump
main: me.WHQ.McDoodleJump.McDoodleJump
version: 1.0
description: >
             McDoodleJump v1.0
commands:
  MDJ:
    description: 1234

yes this is the main class

 

Code:

[13:33:58] [Server thread/INFO]: Wannes001 issued server command: /mdj start
[13:33:58] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mdj' in plugin McDoodleJump v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1298) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1158) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Bukkit-4cb3258]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_31]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_31]
    at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:679) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:361) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:635) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:539) [craftbukkit.jar:git-Bukkit-4cb3258]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_31]
Caused by: java.lang.NullPointerException
    at me.WHQ.McDoodleJump.McDoodleJump.onCommand(McDoodleJump.java:115) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    ... 15 more
[13:34:08] [Server thread/INFO]: Wannes001 issued server command: /mdj stop
[13:34:08] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mdj' in plugin McDoodleJump v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1298) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1158) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Bukkit-4cb3258]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_31]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_31]
    at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:679) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:361) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:635) [craftbukkit.jar:git-Bukkit-4cb3258]
    at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:539) [craftbukkit.jar:git-Bukkit-4cb3258]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_31]
Caused by: java.lang.NullPointerException
    at me.WHQ.McDoodleJump.McDoodleJump.onCommand(McDoodleJump.java:115) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-4cb3258]
    ... 15 more
[13:53:27] [Server thread/INFO]: Wannes001 lost connection: Disconnected
[13:53:28] [Server thread/INFO]: Wannes001 left the game.

 

well, thats an NPE. You can solve this easily by following the link in my signature. We cant say much without knowing what line 115 is.

 

@WHQ
I'm assuming since you liked the solutions, that your problem has been solved. Mark this thread as solved if this is the case.