I have two mods, in separate eclipse packages, but when I define the CommonProxy...

public static final CommonProxy proxy;

...but both mods will try to use the first mod's CommonProxy.

 

AnkhMainFile (First mod):

 

package dmillerw.mods.ankh;

import java.util.Iterator;
import java.util.List;

import net.minecraft.src.CraftingManager;
import net.minecraft.src.IRecipe;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.Init;
import cpw.mods.fml.common.Mod.Instance;
import cpw.mods.fml.common.Mod.PreInit;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.registry.GameRegistry;
import dmillerw.mods.rfidtags.TileEntityRFIDDetector;

@Mod (modid = Reference.MOD_ID, name = Reference.MOD_NAME, version = Reference.MOD_VERSION)
public class AnkhMainFile {

public static int SandstoneColumnRenderID = 100;
public static int SandstoneColumnLightRenderID = 101;

    @SidedProxy(clientSide = "dmillerw.mods.ankh.client.ClientProxy", serverSide = "dmillerw.mods.ankh.CommonProxy")
    public static CommonProxy proxy;

    @Instance("ankh")
    public static AnkhMainFile instance;
    
    @PreInit
public static void preInit(FMLPreInitializationEvent event) {}
    
    @Init
    public static void Init(FMLInitializationEvent event) {
    	GameRegistry.registerTileEntity(TileEntitySunstone.class, "sunStone");
    	
    	proxy.test();
    	
    	//Initializes rendering and textures
    	proxy.initRenderingAndTextures();
    	//Initializes mod blocks.
    	ModBlocks.init();
    	//Initializes mod items.
    	ModItems.init();
    }

}

 

 

RFIDMainFile (Second mod):

 

package dmillerw.mods.rfidtags;

import net.minecraft.src.Block;
import net.minecraft.src.Item;
import net.minecraft.src.ItemStack;
import net.minecraft.src.Material;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.Init;
import cpw.mods.fml.common.Mod.Instance;
import cpw.mods.fml.common.Mod.PreInit;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.network.NetworkMod;
import cpw.mods.fml.common.network.NetworkMod.SidedPacketHandler;
import cpw.mods.fml.common.network.NetworkRegistry;
import cpw.mods.fml.common.registry.GameRegistry;
import cpw.mods.fml.common.registry.LanguageRegistry;
import dmillerw.mods.ankh.CommonProxy;

@Mod (modid = "rfidtags", name = "RFID Tags", version = "1.0.0")
@NetworkMod(clientSideRequired=true, serverSideRequired=false,
clientPacketHandlerSpec =
@SidedPacketHandler(channels = {"RFIDTags" }, packetHandler = ClientPacketHandler.class),
serverPacketHandlerSpec =
@SidedPacketHandler(channels = {"RFIDTags" }, packetHandler = ServerPacketHandler.class))
public class RFIDMainFile {

@SidedProxy(clientSide = "dmillerw.mods.rfidtags.client.ClientProxy", serverSide = "dmillerw.mods.rfidtags.CommonProxy")
public static CommonProxy proxy;
    
    @Instance("rfidtags")
    public static RFIDMainFile instance;
    
    //BLOCKS
    public static Block blockRFIDDetector;
    
    //ITEMS
    public static Item itemRFIDTag;
    
    @PreInit
public void preInit(FMLPreInitializationEvent event) {}
    
    @Init
    public void Init(FMLInitializationEvent event) {  	  	
    	//NetworkRegistry.instance().registerGuiHandler(this, );
    	
    	//proxy.initTileEntities();
    	//proxy.initCraftingHandler();
    	
    	proxy.test();
    	
    	GameRegistry.registerCraftingHandler(new CustomCraftingHandler());
    	
    	itemRFIDTag = new ItemRFIDTag(3500).setItemName("itemRFIDTag");
    	blockRFIDDetector = new BlockRFIDDetector(3501, Material.iron).setBlockName("blockRFIDDetector");
    	
    	GameRegistry.registerBlock(blockRFIDDetector);
    	
    	LanguageRegistry.addName(blockRFIDDetector, "RFID Detector");
    	LanguageRegistry.addName(itemRFIDTag, "RFID Tag");
    	
    	GameRegistry.addRecipe(new ItemStack(itemRFIDTag, 1), new Object[] {"IRI", "ILI", "IRI", 'I', Item.ingotIron, 'R', Item.redstone, 'L', Item.goldNugget});
    	GameRegistry.addShapelessRecipe(new ItemStack(Item.pickaxeDiamond, 1), new Object[] {itemRFIDTag, Item.pickaxeDiamond});
    }

}

 

 

The RFID Tag mod is constantly trying to use the CommonProxy in the Ankh mod package.

If you have different packages for your mods you could have example dmillerw.mod1name.commonproxy and dmillerw.mod2name.commonproxy.

As long as you import the correct one for the correct mod and use the correct one inn the @NetworkMod annotation.

Ah. Turns out it was auto-importing the one from the ankh package. Never even thought to look there. Thanks.