So this is not formatting an is throwing an error.

Ok so im doing a conversion between hexadecimal base 16 an decimal base 10 and for some reason whenever i format it so it has ",(s)" it throws an error and i cant figure out how to fix it, here is my source code.

Code:

    private boolean hexToDec(CommandSender sender, String[] args) {
        Player player = (Player) sender;
        if(args.length == 0) {
            player.sendMessage(ChatColor.GREEN + " Please put in a value to convert.");
        }else{
           
            try {
                long ConvertHTD = Long.parseLong(args[0], 16);
                String ConvertedHTD = Long.toString(ConvertHTD, 10);
                String ConvertHTBF = new DecimalFormat("###,###,###,###,###,###,###,###,###,###,###,###").format(ConvertedHTD);
                player.sendMessage(ChatColor.AQUA + args[0] + ChatColor.GREEN + " in Hexadecimal converted to Decimal is " + ChatColor.AQUA + ConvertHTBF);
            }catch(NumberFormatException exception) {
                player.sendMessage(ChatColor.AQUA + "[Calc] " + ChatColor.RED + "That is not a valid problem, please only use numbers.");
            }
        }
        return true;
    }

 

@Hyperenci
Can you show us the error thrown?

 

Yes. let me get the error for you. And o sorry that is the working code, here is the error throwing code.

Code:

    private boolean hexToDec(CommandSender sender, String[] args) {
        Player player = (Player) sender;
        if(args.length == 0) {
            player.sendMessage(ChatColor.GREEN + " Please put in a value to convert.");
        }else{
          
            try {
                long ConvertHTD = Long.parseLong(args[0], 16);
                String ConvertedHTD = Long.toString(ConvertHTD, 10);
                String ConvertHTBF = new DecimalFormat("###,###,###,###,###,###,###,###,###,###,###,###").format(ConvertedHTD);
                player.sendMessage(ChatColor.AQUA + args[0] + ChatColor.GREEN + " in Hexadecimal converted to Decimal is " + ChatColor.AQUA + ConvertHTBF);
            }catch(NumberFormatException exception) {
                player.sendMessage(ChatColor.AQUA + "[Calc] " + ChatColor.RED + "That is not a valid problem, please only use numbers.");
            }
        }
        return true;
    }

So i cant get the error but it says error and that it is null?

 

@Hyperenci Is it a nullpointerexception? Read this
Also in the bits of code you provided, don't cast blindly, and follow naming conventions thus making the code easier to read

 

Also im not casting blindly im checking if the player is a player earlier in my code, my class has over 800 lines of code and thats why i only pasted the method that was throwing errors. And all it says is error : null

 

@Hyperenci Why do you check for player and then use a CommandSender arg? Then you just end up recasting, seems a bit pointless.

 

It was just the way i had it set up/

 

Couldn't have known that, although i agree with @bwfcwalshy that it seems a litle pointless :/

There should be a stack trace, unless the exception is handled and only the message is displayed. Thats why we keep asking for the error Without it, all i can tell you is that something is null which isnt really helpfull is it.

 

Ok so now it is showing a stacktrace and ill post it here.

C:\Users\Hank\Desktop\Files\Server\Bukkit and Plugins\Offline-Server>java -Xms1024M -Xmx1024M -jar craftbukkit-1.8.8.jar
Loading libraries, please wait...
[01:19:03 INFO]: Starting minecraft server version 1.8.8
[01:19:03 INFO]: Loading properties
[01:19:03 INFO]: Default game type: CREATIVE
[01:19:03 INFO]: Generating keypair
[01:19:04 INFO]: Starting Minecraft server on *:25565
[01:19:04 INFO]: Using default channel type
[01:19:04 INFO]: This server is running CraftBukkit version git-Bukkit-efe04b8 (MC: 1.8.8) (Implementing API version 1.8.8-R0.1-SNAPSHOT)
[01:19:04 INFO]: [RedUtil] Loading RedUtil v0.24
[01:19:04 INFO]: [DeathRandomSpawn] Loading DeathRandomSpawn v1.0
[01:19:04 WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[01:19:04 WARN]: The server will make no attempt to authenticate usernames. Beware.
[01:19:04 WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[01:19:04 WARN]: To change this, set "online-mode" to "true" in the server.properties file.
[01:19:04 INFO]: Preparing level "world"
[01:19:05 INFO]: Preparing start region for level 0 (Seed: -949258421629280314)
[01:19:06 INFO]: Preparing spawn area: 31%
[01:19:07 INFO]: Preparing spawn area: 76%
[01:19:07 INFO]: Preparing start region for level 1 (Seed: -949258421629280314)
[01:19:08 INFO]: Preparing spawn area: 48%
[01:19:09 INFO]: Preparing spawn area: 89%
[01:19:10 INFO]: Preparing start region for level 2 (Seed: -949258421629280314)
[01:19:10 INFO]: [RedUtil] Enabling RedUtil v0.24
[01:19:10 INFO]: RedUtils Enabled
[01:19:10 INFO]: [DeathRandomSpawn] Enabling DeathRandomSpawn v1.0
[01:19:10 INFO]: Server permissions file permissions.yml is empty, ignoring it
[01:19:10 INFO]: Done (5.775s)! For help, type "help" or "?"
>hextodec
[01:19:35 INFO]: Please send the command from in-game.
[01:21:23 INFO]: Dacotathebeast[/127.0.0.1:51356] logged in with entity id 154 at ([world]135.94839199288975, 109.60534639311507, 134.9796750861277)
[01:21:31 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 7749ms behind, skipping 154 tick(s)
[01:21:40 INFO]: Dacotathebeast issued server command: /hectodec
[01:21:41 INFO]: Dacotathebeast issued server command: /hextodec
[01:21:42 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2284ms behind, skipping 45 tick(s)
[01:21:45 INFO]: Dacotathebeast issued server command: /hextodec F
[01:21:45 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'hextodec' in plugin RedUtil v0.24
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:620) ~[craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1106) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:966) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_91]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_91]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:673) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537) [craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]
Caused by: java.lang.IllegalArgumentException: Cannot format given Object as a Number
at java.text.DecimalFormat.format(Unknown Source) ~[?:1.8.0_91]
at java.text.Format.format(Unknown Source) ~[?:1.8.0_91]
at me.coderbrik.red.Main.hexToDec(Main.java:145) ~[?:?]
at me.coderbrik.red.Main.onCommand(Main.java:68) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.8.8.jar:git-Bukkit-efe04b8]
... 15 more
>

 

Aha! So the error isn't null afterall, it is an IllegalArgumentException thrown in the method hexToDecimal (line 145 of Main) because the provided parameter can not be formated to a number
The param may be null and thats what the error is 'trying to say'

 

We do not support offline mode servers.