[1.7.10] [SOLVED] ClassDefNotFound after ClassTransformer is called?

superckl · August 12, 2014

Hey everyone,

I'm having a bit of a problem patching classes with ASM. I'm attempting to patch two functions, one in BiomeGenBase and one in ChunkProviderGenerate. The patching works fine for BiomeGenBase, however, the class cannot be found by the JVM once I've patched it. Here is my class transformer:

public class ClassTransformer implements IClassTransformer{

@Override
public byte[] transform(String name, String transformedName, byte[] bytes) {
	FMLRelaunchLog.warning("%s", name);
	if(find(name, class_biomeGenBase) != -1){
		ClassNode cNode = new ClassNode();
		ClassReader reader = new ClassReader(bytes);
		reader.accept(cNode, 0);
		MethodNode mNode = null;
		//FMLRelaunchLog.warning("%s", Arrays.toString(cNode.methods.toArray()));
		for(MethodNode node:cNode.methods){
			FMLRelaunchLog.warning("%s:%s", node.name, node.desc);
			if(find(node.name, method_genBiomeTerrain) != -1 && find(node.desc, desc_genBiomeTerrain) != -1){
				mNode = node;
				break;
			}
		}
		if(mNode == null){
			LogHelper.error("Failed to replace water!");
			return bytes;
		}
		boolean fixed = false;
		for(AbstractInsnNode node:mNode.instructions.toArray()){
			if(node instanceof FieldInsnNode){
				FieldInsnNode vNode = (FieldInsnNode) node;
				LogHelper.info(vNode.name);
				if(find(vNode.name, field_blockWater) != -1){
					node = vNode.getNext();
					if(node instanceof VarInsnNode && ((VarInsnNode)node).var == 10){
						vNode.owner = "me/superckl/betteroceans/common/reference/ModBlocks";
						vNode.name = "saltWater";
						vNode.desc = "Lme/superckl/betteroceans/common/fluid/block/BlockFluidSaltWater;";
						LogHelper.info("Patched "+name+"."+mNode.name);
						fixed = true;
						break;
					}
				}
			}
		}
		LogHelper.info("Writing class with fixed: "+fixed);
		ClassWriter cWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
		cNode.accept(cWriter);
		return cWriter.toByteArray();
	}else if(find(name, class_chunkProviderGenerate) != -1){
		ClassNode cNode = new ClassNode();
		ClassReader reader = new ClassReader(bytes);
		reader.accept(cNode, 0);
		MethodNode mNode = null;
		//FMLRelaunchLog.warning("%s", Arrays.toString(cNode.methods.toArray()));
		for(MethodNode node:cNode.methods){
			FMLRelaunchLog.warning("%s:%s", node.name, node.desc);
			if(find(node.name, method_func_147424_a) != -1 && find(node.desc, desc_func_147424_a) != -1){
				mNode = node;
				break;
			}
		}
		if(mNode == null){
			LogHelper.error("Failed to replace water!");
			return bytes;
		}
		for(AbstractInsnNode node:mNode.instructions.toArray()){
			if(node instanceof FieldInsnNode){
				FieldInsnNode vNode = (FieldInsnNode) node;
				if(find(vNode.name, field_blockWater) != -1){
					vNode.owner = "me/superckl/betteroceans/common/reference/ModBlocks";
					vNode.name = "saltWater";
					vNode.desc = "Lme/superckl/betteroceans/common/fluid/block/BlockFluidSaltWater;";
					LogHelper.info("Patched "+name+"."+mNode.name);
				}
			}
		}
		ClassWriter cWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
		cNode.accept(cWriter);
		return cWriter.toByteArray();
	}
	return bytes;
}

public static <T> int find(final T toFind, final T[] in){
	for(int i = 0; i < in.length; i++)
		if(in[i] == toFind || in[i].equals(toFind))
			return i;
	return -1;
}


	public static final String[] field_ocean = {"ocean", "field_76771_b"};
	public static final String[] field_deepOcean = {"deepOcean", "field_150575_M"};
	public static final String[] field_blockWater = {"water", "field_150355_j", "j"};

	public static final String[] method_genBiomeTerrain = {"genBiomeTerrain", "func_150560_b", "b"};
	public static final String[] method_func_147424_a = {"func_147424_a", "a"};

	public static final String[] desc_genBiomeTerrain = {"(Lnet/minecraft/world/World;Ljava/util/Random;[Lnet/minecraft/block/Block;[bIID)V", "(Lahb;Ljava/util/Random;[Laji;[bIID)V"};
	public static final String[] desc_func_147424_a = {"(II[Lnet/minecraft/block/Block;)V", "(II[Laji;)V"};

	public static final String[] class_biomeGenBase = {"net.minecraft.world.biome.BiomeGenBase", "ahu"};
	public static final String[] class_chunkProviderGenerate = {"net.minecraft.world.gen.ChunkProviderGenerate", "aqz"};

}

And the error I get:

java.lang.NoClassDefFoundError: me/superckl/betteroceans/common/gen/BiomeGenBetterOcean

at me.superckl.betteroceans.common.utility.BiomeHelper.replaceOceanBiomes(BiomeHelper.java:22) ~[biomeHelper.class:?]

at me.superckl.betteroceans.BetterOceans.init(BetterOceans.java:59) ~[betterOceans.class:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_05]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]

at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513) ~[forge-1.7.10-10.13.0.1183.jar:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_05]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-16.0.jar:?]

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-16.0.jar:?]

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-16.0.jar:?]

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-16.0.jar:?]

at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-16.0.jar:?]

at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208) ~[forge-1.7.10-10.13.0.1183.jar:?]

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187) ~[forge-1.7.10-10.13.0.1183.jar:?]