NullPointerException when creating world with custom chunk provider

[tuxillator]

I'm getting a NullPointerException when trying to create a world with a custom chunk provider. Seems to be related to the WorldProvider (don't know why... I'm registering a custom DimensionType, nothing to do with WorldType):

> createworld sandbox nothanks sandbox
[00:41:50] [CanaryMod] [INFO] [NOTICE]: Please wait while the world is generated...
[00:41:50] [CanaryMod] [INFO] [NOTICE]: Failed to create world. Check console for errors.
[00:41:50] [CanaryMod] [ERROR]: Exception thrown while creating a world
java.lang.NullPointerException
        at net.minecraft.world.World.<init>(World.java:132) ~[CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.minecraft.world.WorldServer.<init>(WorldServer.java:101) ~[CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.minecraft.world.WorldServerMulti.<init>(WorldServerMulti.java:18) ~[CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.api.world.CanaryWorldManager.createWorld(CanaryWorldManager.java:239) ~[CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.api.world.CanaryWorldManager.createWorld(CanaryWorldManager.java:205) ~[CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.commandsys.commands.world.CreateWorldCommand.execute(CreateWorldCommand.java:54) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.commandsys.CommandList.createWorld(CommandList.java:2008) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_25]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_25]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_25]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_25]
        at net.canarymod.commandsys.CommandManager$1.execute(CommandManager.java:322) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.commandsys.CanaryCommand.parseCommand(CanaryCommand.java:103) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.commandsys.CommandManager.parseCommand(CommandManager.java:189) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.canarymod.api.CanaryServer.consoleCommand(CanaryServer.java:170) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]
        at net.minecraft.server.dedicated.DedicatedServer$2.run(DedicatedServer.java:139) [CanaryMod-1.8.0-1.2.0-SNAPSHOT-shaded.jar:1.8.0-1.2.0-SNAPSHOT]

[tuxillator]

There's some funny signature stuff going on with WorldType, DimensionType and DimensionProvider.

world = (WorldServer) new WorldServerMulti(mcserver, isavehandler, dimType.getId(), (WorldServer) ((CanaryWorld) getWorld(name, net.canarymod.api.world.DimensionType.NORMAL, true)).getHandle(), mcserver.b, worldinfo).b();

3rd parameter of WorldServerMulti() is eventually the world type, but here it's looking up dimension type instead.

Further, the getWorld() call dimension type is hardcoded to NORMAL, explaining some of the weird errors I get when debug logging is enabled:

> createworld sandbox nothanks sandbox
[01:49:54] [CanaryMod] [INFO] [NOTICE]: Please wait while the world is generated...
[01:49:54] [CanaryMod] [INFO]: Could not find the world configuration for sandbox_SANDBOX at config/worlds/sandbox, creating default.
[01:49:54] [CanaryMod] [DEBUG]: Updating new config for sandbox_SANDBOX
[01:49:54] [CanaryMod] [DEBUG]: World sandboxdoes not exist, we can autoload, will load!
[01:49:54] [CanaryMod] [DEBUG]: Config already exists for sandbox_NORMAL
[01:49:54] [net.minecraft.server.MinecraftServer] [INFO]: Preparing start region for level sandbox_NORMAL (0)
[01:49:55] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 8%
[01:49:56] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 16%
[01:49:57] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 26%
[01:49:58] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 38%
[01:49:59] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 51%
[01:50:00] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 61%
[01:50:01] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 72%
[01:50:02] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 84%
[01:50:03] [net.minecraft.server.MinecraftServer] [INFO]: Preparing spawn area: 98%
[01:50:03] [CanaryMod] [DEBUG]: Adding new world to world manager, filed as sandbox_NORMAL
[01:50:03] [CanaryMod] [INFO] [NOTICE]: Failed to create world. Check console for errors.
[01:50:03] [CanaryMod] [ERROR]: Exception thrown while creating a world
java.lang.NullPointerException

[damagefilter]

The custom world provider is not properly implemented and not tested at all. Sorry.
If you happen to know your way around worldgen, we're open for suggestions and hints on implementing it properly.