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FML loads @Mod File, promptly declares it can't find it

QuantumLeaf7895

By QuantumLeaf7895
in Support & Bug Reports

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QuantumLeaf7895 Tree Puncher

QuantumLeaf7895

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Hi All,

I've been working on a mod, and have encountered an aggravating problem.  My mod, written using eclipse 4.2, the 7.x branch of MCP on a Mac OSX 10.6.8 (with the default java SDK and python implementations) refuses to compile properly.  While the mod runs perfectly inside eclipse, compiling, reobfuscating it and loading into a .minecraft folder with the latest version of forge properly installed (I checked by booting minecraft with a different mod loaded -- it worked fine) causes minecraft to crash, throwing a ClassNotFoundException related to the @Mod class -- Even when I remove literally every other class. 

 

The console error log looks like this:

 

9/23/12 10:49:55 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:49:55 [iNFO] [ForgeModLoader] Forge Mod Loader version 3.0.196.366 for Minecraft client:1.3.2, server:1.3.2 loading

9/23/12 10:49:58 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:49:58 [iNFO] [sTDOUT] 27 achievements

9/23/12 10:49:58 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:49:58 [iNFO] [sTDOUT] 195 recipes

9/23/12 10:49:58 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:49:58 [iNFO] [sTDOUT] Setting user: quantumleaf7895, -1941226498013063396

9/23/12 10:49:59 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:49:59 [iNFO] [sTDOUT] LWJGL Version: 2.4.2

9/23/12 10:50:00 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:00 [iNFO] [ForgeModLoader] Attempting early MinecraftForge initialization

9/23/12 10:50:00 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:00 [iNFO] [ForgeModLoader] Completed early MinecraftForge initialization

9/23/12 10:50:00 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:00 [iNFO] [ForgeModLoader] Searching /Users/matthew38/Library/Application Support/minecraft/mods for mods

9/23/12 10:50:01 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:01 [iNFO] [ForgeModLoader] Forge Mod Loader has identified 5 mods to load

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:02 [sEVERE] [ForgeModLoader] Fatal errors were detected during the transition from CONSTRUCTING to PREINITIALIZATION. Loading cannot continue

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:02 [sEVERE] [ForgeModLoader]

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] FML [Forge Mod Loader] (coremods) Unloaded->Constructed

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] Forge [Minecraft Forge] (coremods) Unloaded->Constructed

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] GasSystems_v1 [GasSystems-v1] (GasSystems) Unloaded->Errored

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] IC2 [industrialCraft 2] (industrialcraft-2_1.106.jar) Unloaded->Constructed

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] GregTech_Addon [GregTech-Addon] (gregtechmod.zip) Unloaded->Constructed

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:02 [sEVERE] [ForgeModLoader] The following problems were captured during this phase

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] 2012-09-23 22:50:02 [sEVERE] [ForgeModLoader] Caught exception from GasSystems_v1

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] java.lang.ClassNotFoundException: GasSystems.GasSystems_v1

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:125)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.Class.forName0(Native Method)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.Class.forName(Class.java:247)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:341)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.reflect.Method.invoke(Method.java:597)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.post(EventBus.java:268)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:124)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.reflect.Method.invoke(Method.java:597)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at com.google.common.eventbus.EventBus.post(EventBus.java:268)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:81)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.Loader.loadMods(Loader.java:458)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:144)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at net.minecraft.client.Minecraft.a(Minecraft.java:405)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at net.minecraft.client.Minecraft.run(Minecraft.java:737)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at java.lang.Thread.run(Thread.java:680)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] Caused by: java.lang.NullPointerException

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at org.objectweb.asm.ClassReader.<init>(Unknown Source)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:27)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:167)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:118)

9/23/12 10:50:02 PM [0x0-0x34034].com.Mojang Specifications.Minecraft.Minecraft[373] ... 31 more

 

 

The minecraft error log looks like this:

 

 

      Minecraft has crashed!     

      ----------------------     

 

Minecraft has stopped running because it encountered a problem; Failed to start game

This error has been saved to /Users/matthew38/Library/Application Support/minecraft/crash-reports/crash-2012-09-23_22.50.13-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

 

 

 

--- BEGIN ERROR REPORT 44ebe440 --------

Generated 9/23/12 10:50 PM

 

- Minecraft Version: 1.3.2

- Operating System: Mac OS X (i386) version 10.6.8

- Java Version: 1.6.0_35, Apple Inc.

- Java VM Version: Java HotSpot Client VM (mixed mode), Apple Inc.

- Memory: 498926704 bytes (475 MB) / 535232512 bytes (510 MB) up to 1070399488 bytes (1020 MB)

- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M

- FML: FML v3.0.196.366 Minecraft Forge 4.1.1.251 5 mods loaded, 5 mods active

FML [Forge Mod Loader] (coremods) Unloaded->Constructed

Forge [Minecraft Forge] (coremods) Unloaded->Constructed

GasSystems_v1 [GasSystems-v1] (GasSystems) Unloaded->Errored

IC2 [industrialCraft 2] (industrialcraft-2_1.106.jar) Unloaded->Constructed

GregTech_Addon [GregTech-Addon] (gregtechmod.zip) Unloaded->Constructed

- LWJGL: 2.4.2

- OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-1.6.36, NVIDIA Corporation

- Is Modded: Definitely; 'forge,fml'

- Type: Client

- Texture Pack: Default

- Profiler Position: N/A (disabled)

 

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: GasSystems.GasSystems_v1

at cpw.mods.fml.common.LoadController.transition(LoadController.java:102)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:459)

at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:144)

at net.minecraft.client.Minecraft.a(Minecraft.java:405)

at net.minecraft.client.Minecraft.run(Minecraft.java:737)

at java.lang.Thread.run(Thread.java:680)

Caused by: java.lang.ClassNotFoundException: GasSystems.GasSystems_v1

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:125)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:247)

at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:341)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

at com.google.common.eventbus.EventBus.post(EventBus.java:268)

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:124)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

at com.google.common.eventbus.EventBus.post(EventBus.java:268)

at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:81)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:458)

... 4 more

Caused by: java.lang.NullPointerException

at org.objectweb.asm.ClassReader.<init>(Unknown Source)

at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:27)

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:167)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:118)

... 31 more

--- END ERROR REPORT b08b16ee ----------

 

 

 

And GasSystems_v1 looks like this:

 

 

package GasSystems;

 

import net.minecraft.src.Item;

import cpw.mods.fml.common.Mod;

import cpw.mods.fml.common.Mod.Init;

import cpw.mods.fml.common.event.FMLInitializationEvent;

import cpw.mods.fml.common.network.NetworkMod;

import cpw.mods.fml.common.registry.LanguageRegistry;

 

 

@Mod(modid = "GasSystems_v1", name="GasSystems-v1", version="1")

@NetworkMod(clientSideRequired = true, serverSideRequired = false)

public class GasSystems_v1 {

public static Item testItem;

 

 

@Init

public void load(FMLInitializationEvent event){

 

testItem = new GasSystems.common.TestItem(2222);

 

LanguageRegistry.addName(testItem,"Test Item");

}

}

 

 

What am I doing wrong?

 

Incidentally, I (vaguely) remember a similar bug -- back in the 1.2.5 era, I would get a similar error thrown when the folder containing my mod had a different name from the mod_ class.

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LexManos Reality Controller

LexManos

Posted
Posted

Its straight forward, you're not packaging your mod correctly.

Post a full list of everything in your mod exactly how its structured, then compare that to what java is looking for, you'll find a issue.

 

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
Consider supporting the team on Patreon

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QuantumLeaf7895 Tree Puncher

QuantumLeaf7895

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Its straight forward, you're not packaging your mod correctly.

Post a full list of everything in your mod exactly how its structured, then compare that to what java is looking for, you'll find a issue.

 

In MCP, the GasSystems package is located inside the common folder, containing the @Mod file and the GasSystems.common package which contains the TestItem file. . .

 

I'm still quite a bit inexperienced with java -- how would I found out what package java is looking for?  The error log only lists the package declared in the @Mod file, not where it's looking for that package.

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