Attempt to use a Spigot/Bukkit plugin from a Forge mod.

[BadBoy6767]

Here's the story (Sorry for it being so long, It's like this so there'll be less questions):

I have been working on a small server and I noticed that ComputerCraft turtles are able to grief areas protected by the WorldGuard plugin.
The reason was obvious (to me at least) and so I searched and found out that ComputerCraft has a small API.
Using this API I can force turtles to not dig blocks (interfaces and polymorphism and all that crap).
So in a Bukkit plugin I'm making, I added the ComputerCraft JAR to the classpath and called it from my plugin.

After quitting due to dependency hell (The interface method had an argument of type net.minecraft.world.World, and for some reason the server JAR did not have that class), I tried doing it the other way.
So I made a small server-only mod that used this ComputerCraft API. Everything compiled flawlessly and I put it in my servers "mods" folder.
Everything was working until my test turtle tried to dig a block. The server crashed.

The reason was that a WorldGuard class was not found.

 

I assumed that all Forge/Bukkit mods would be in the same classpath at runtime. Seems that that is false.

java.lang.NoClassDefFoundError: com/sk89q/worldguard/bukkit/WGBukkit
	at org.midnightas.axaxa.serverside.AxaxaServerside.isBlockEditable(AxaxaServerside.java:39) ~[AxaxaServerside.class:?]
	at dan200.computercraft.ComputerCraft.isBlockEditable(ComputerCraft.java:456) ~[ComputerCraft.class:?]
	at dan200.computercraft.shared.turtle.upgrades.TurtleTool.dig(TurtleTool.java:207) ~[TurtleTool.class:?]
	at dan200.computercraft.shared.turtle.upgrades.TurtleTool.useTool(TurtleTool.java:97) ~[TurtleTool.class:?]
	at dan200.computercraft.shared.turtle.core.TurtleToolCommand.execute(TurtleToolCommand.java:36) ~[TurtleToolCommand.class:?]
	at dan200.computercraft.shared.turtle.core.TurtleBrain.updateCommands(TurtleBrain.java:995) ~[TurtleBrain.class:?]
	at dan200.computercraft.shared.turtle.core.TurtleBrain.update(TurtleBrain.java:183) ~[TurtleBrain.class:?]
	at dan200.computercraft.shared.turtle.blocks.TileTurtle.func_145845_h(TileTurtle.java:278) ~[TileTurtle.class:?]
	at net.minecraft.world.World.func_72939_s(World.java:2548) ~[ahb.class:?]
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:673) ~[mt.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:976) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) ~[lt.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:831) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:683) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: java.lang.ClassNotFoundException: com.sk89q.worldguard.bukkit.WGBukkit
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_111]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_111]
	... 15 more
Caused by: java.lang.NullPointerException

The exception says that my isBlockEditable (the interface method) was called, and line 39 is a line which uses the com.sk89q.worldguard.bukkit.WGBukkit class.

[Leomelonseeds]

Post the code...

[BadBoy6767]

The problem is not with my code.
It is the classpath of my project and how it's different at runtime.

[BadBoy6767]

Nothing?

[Leomelonseeds]

On 3/5/2017 at 9:33 AM, BadBoy6767 said:

Caused by: java.lang.ClassNotFoundException: com.sk89q.worldguard.bukkit.WGBukkit

Hmmmmmm

Edited March 8, 2017 by Leomelonseeds

[BadBoy6767]

Oh my god I know about that, I know how to read exceptions.

My question is why is WGBukkit not in the classpath when you run the server?

[Guest]

Because Bukkit/Spigot plugins have nothing to do with Forge mods. There is an argument in the @Mod annotation for a Bukkit class but I don't know if that works.

[LexManos]

The question is, why do you think it would be on the classpath?

Nothing adds it? Pretty sure that Sponge/Bukkit hide all plugin classes from all other plugins/whatever.

You'll have to ask whoever you're using for your Bukkit API on the server.

 

As for the 'Dependancy hell' yes... Minecraft is a dependancy of Mods... that's how it works...

And you can't depend on minecraft code from Bukkit plugins that's the entire point.

The reason the 'net.minecraft.world.World' class doesn't exist in your server is because it isn't named that. Bukkit uses their own mappings for classes, methods, and fields.

When we get Minecraft from Mojang, everything is obfusicated, class names like 'a', 'b', 'aba', We translate them into useable names.