Help getting .class files from Eclipse to working minecraft forge installation

[meathelix]

I've been searching all over the net for a comprehensive guide to modding with Forge, and while there are a lot of getting started tutorials and snippets here and there, I haven't seen one that takes you from coding the mod, to compiling it in MCP to zipping it up for using with Forge in a real world installation of Minecraft.

 

So here's my issue.

 

I have a super barebones mod. All it has right now is a temp recipe and a getVersion method. It's all in one file (mod_HelloWorld.class) and it works fine when I run it from within Eclipse or from the startclient.bat file in MCP.

 

The problem comes when I try to take the .class files from my MCP folders, zip them (mod_HelloWorld.zip) and drop them into a mods folder in a standalone installation of Minecraft (the one over in %appdata%).

 

When I try to run the executable with that arrangement, I get past the Login screen and I get the following error:

 

 

3 mods loaded

Minecraft Forge 3.3.7.135

FML v2.2.48.135

Forge Mod Loader version 2.2.48.135 for Minecraft 1.2.5

mod_MinecraftForge : Loaded (minecraftForge.jar)

 

 

      Minecraft has crashed!     

      ----------------------     

 

Minecraft has stopped running because it encountered a problem.

 

 

 

 

--- BEGIN ERROR REPORT 441744c --------

Generated 6/20/12 5:11 PM

 

Minecraft: Minecraft 1.2.5

OS: Windows 7 (amd64) version 6.1

Java: 1.7.0_05, Oracle Corporation

VM: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

LWJGL: 2.4.2

OpenGL: GeForce GTX 470/PCI/SSE2 version 4.2.0, NVIDIA Corporation

 

cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: mod_HelloWorld(wrong name: net/minecraft/src/mod_HelloWorld)

at cpw.mods.fml.common.Loader.load(Loader.java:436)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:592)

at cpw.mods.fml.client.FMLClientHandler.onPreLoad(FMLClientHandler.java:193)

at net.minecraft.client.Minecraft.a(Minecraft.java:383)

at net.minecraft.client.Minecraft.run(Minecraft.java:735)

at java.lang.Thread.run(Unknown Source)

 

 

It's obvious that I'm missing some step somewhere in between, but I haven't been able to find an A to B tutorial that might illuminate what that might be.

 

I have other mods in the mod folder that Forge has no problem loading, so it's not a problem with the Forge installation. the META-INF and all that was removed from my Minecraft.jar, etc.

 

Any ideas?

[LexManos]

You need to reobfusicate using MCP.

[meathelix]

I had been avoiding obfuscation because I saw some forum posts that advised against doing that. Maybe I was getting the wrong impression out of context.

 

Either way, it worked! Thanks.

[OvermindDL1]

MCP's reobfuscation does not obfuscate 'your' mod, rather it reobfuscates the Minecraft interfaces so your mod will work with normal Minecraft.