Solved ERROR 'NULL' when executing a command.

How to fix this error?

ERROR:

Code:

2013-10-11 19:57:19 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'buildmode' in plugin GreedCraft v0.5
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
    at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:527)
    at net.minecraft.server.v1_6_R3.PlayerConnection.handleCommand(PlayerConnection.java:977)
    at net.minecraft.server.v1_6_R3.PlayerConnection.chat(PlayerConnection.java:888)
    at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:835)
    at net.minecraft.server.v1_6_R3.Packet3Chat.handle(SourceFile:49)
    at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
    at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:117)
    at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
    at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
    at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
    at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
    at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
    at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
    at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
    at com.greedycraft.core.Primary.onCommand(Primary.java:64)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)

Code:java

@Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
        if(sender instanceof Player){
            Player player = (Player)sender;
            boolean buildmode = false;
 
            if(cmd.getName().equalsIgnoreCase("buildmode")){
                buildmode = !buildmode;
 
                if(buildmode){
                    Permission.playerAdd(player, "-essentials.tpa");
                    Permission.playerAdd(player, "-essentials.tpaccept");
                    Permission.playerAdd(player, "-essentials.home");
                    Permission.playerAdd(player, "-factions.home");
                    player.getEquipment().clear();
                    player.getInventory().clear();
                    player.setGameMode(GameMode.CREATIVE);
                    player.sendMessage("You went to buildmode.");
                }else{
                    Permission.playerRemove(player, "-essentials.tpa");
                    Permission.playerRemove(player, "-essentials.tpaccept");
                    Permission.playerRemove(player, "-essentials.home");
                    Permission.playerRemove(player, "-factions.home");
                    player.getEquipment().clear();
                    player.getInventory().clear();
                    player.setGameMode(GameMode.SURVIVAL);
                    player.sendMessage("You went off buildmode.");
                }
            }
        }
        return false;
    }

 

What is line 64?

 

Make sure you return true; at some stage.

 

If I had to guess I would say it's because the players inventory or equipment is null? At least that's the only thing I can think of.

 

T0pAz7
May wanna have the boolean separate for each player

 

Or separate from the method entirely, stored in a hashmap. In the current configuration, players will never be able to leave buildmode.

T0pAz7

You should provide a full class, or at least tell us what line 64 is in your "Primary" class.

 

I fixed the problem long time ago. Sorry guys and thanks for helping me out.