Solved Small NullPointerException

I fixed the problem by declaring the location once it was needed, not before. Now everything works.

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I'm making a Paintball plugin and I have a small error:

Code:java

World w;
double bluex;
double bluey;
double bluez;
double redx;
double redy;
double redz;
 
public Arena(int number) {
this.w = Bukkit.getServer().getWorld(settings.getConfig().getString("arenas." + number + ".world"));
this.bluex = settings.getConfig().getDouble("arenas." + number + ".blue.x");
this.bluey = settings.getConfig().getDouble("arenas." + number + ".blue.y");
this.bluez = settings.getConfig().getDouble("arenas." + number + ".blue.z");
this.redx = settings.getConfig().getDouble("arenas." + number + ".red.x");
this.redy = settings.getConfig().getDouble("arenas." + number + ".red.y");
this.redz = settings.getConfig().getDouble("arenas." + number + ".red.z");
}
 
Location redspawn = new Location(w, redx, redy, redz);
Location bluespawn = new Location(w, bluex, bluey, bluez);

when I try to use the teleport method in the Player class and the redspawn location it throws a NullPointerException.

Here's the config:

Code:

#
# This number is used by the plugin. Don't touch it!
numberofarenas: 0
general:
  amntofsnowballs: 20
  compassesenabled: true
  playersneededtobegin: 10
  countdowntime: 10
arenas:
  '1':
    world: HG3
    blue:
      x: -481.89693192596064
      y: 65.0
      z: -3.471071591544767
    red:
      x: -481.9367099111598
      y: 65.0
      z: 13.067123732732089
lobbyspawn:
  world: HG3
  x: -469.2297323088223
  y: 65.0
  z: 4.621867304303069

Here's the lovely stack trace (sorry its upside down, MultiCraft did it :3)

Code:

01.12 21:09:59 [Server] SEVERE at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.ServerConnection.b(SourceFile:39)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:858)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:903)
01.12 21:09:59 [Server] SEVERE at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:985)
01.12 21:09:59 [Server] SEVERE at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)
01.12 21:09:59 [Server] SEVERE at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
01.12 21:09:59 [Server] SEVERE at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.commands.CommandManager.onCommand(CommandManager.java:75)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.commands.Join.onCommand(Join.java:18)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.Arena.join(Arena.java:132)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.Arena.assignTeam(Arena.java:125)
01.12 21:09:59 [Server] SEVERE at org.bukkit.craftbukkit.entity.CraftEntity.teleport(CraftEntity.java:175)
01.12 21:09:59 [Server] SEVERE at org.bukkit.craftbukkit.entity.CraftPlayer.teleport(CraftPlayer.java:377)
01.12 21:09:59 [Server] SEVERE java.lang.NullPointerException

Assume that settings.getConfig() returns the plugin's config. I know it works because the spawn setting command works.

 

Code:java

01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.commands.CommandManager.onCommand(CommandManager.java:75)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.commands.Join.onCommand(Join.java:18)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.Arena.join(Arena.java:132)
01.12 21:09:59 [Server] SEVERE at me.pogostick29.skyball.Arena.assignTeam(Arena.java:125)

Line 75 of CommandManager is where you want to look, also line 18 of Join.java and lines 132 and 125 of Arena.java.
Something in those lines, or referring to those lines are causing the NPE. Maybe post full source?

Also, use

Code:

[syntax=java]
...
[/syntax]

It allows for line numbering and syntax highlighting

 

The problem is that when the Join method in the Arena class tries to teleport a player, but one of the values in the location is null.

 

I would assume the world is null. The world you're trying to access is not loaded, so Bukkit.getWorld() returns null.

 

I am sure that the world is loaded.

 

So check if it's null right after you get it.