Working

src/main/java/com/myname/mymodid/API/ReplacementManager.java

@@ -9,10 +9,14 @@ import java.util.Map;
 public class ReplacementManager {
     private static final Map<ItemStackKey, ItemStackKey> replacementMap = new HashMap<>();
 
+    // Public API for adding replacements.
+
+    @SuppressWarnings("unused")
     public static void addReplacement(Item itemIn, int metaIn, Item itemOut, int metaOut) {
         replacementMap.put(new ItemStackKey(itemIn, metaIn), new ItemStackKey(itemOut, metaOut));
     }
 
+    @SuppressWarnings("unused")
     public static ItemStackKey getReplacement(Item itemIn, int metaIn) {
         return replacementMap.getOrDefault(new ItemStackKey(itemIn, metaIn), null);
     }

src/main/java/com/myname/mymodid/ClientProxy.java

@@ -1,8 +0,0 @@
-package com.myname.mymodid;
-
-public class ClientProxy extends CommonProxy {
-
-    // Override CommonProxy methods here, if you want a different behaviour on the client (e.g. registering renders).
-    // Don't forget to call the super methods as well.
-
-}

src/main/java/com/myname/mymodid/CommonProxy.java

@@ -1,27 +0,0 @@
-package com.myname.mymodid;
-
-import cpw.mods.fml.common.event.FMLInitializationEvent;
-import cpw.mods.fml.common.event.FMLPostInitializationEvent;
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import cpw.mods.fml.common.event.FMLServerStartingEvent;
-
-public class CommonProxy {
-
-    // preInit "Run before anything else. Read your config, create blocks, items, etc, and register them with the
-    // GameRegistry." (Remove if not needed)
-    public void preInit(FMLPreInitializationEvent event) {
-        Config.synchronizeConfiguration(event.getSuggestedConfigurationFile());
-
-        MyMod.LOG.info(Config.greeting);
-        MyMod.LOG.info("I am " + Tags.MODNAME + " at version " + Tags.VERSION);
-    }
-
-    // load "Do your mod setup. Build whatever data structures you care about. Register recipes." (Remove if not needed)
-    public void init(FMLInitializationEvent event) {}
-
-    // postInit "Handle interaction with other mods, complete your setup based on this." (Remove if not needed)
-    public void postInit(FMLPostInitializationEvent event) {}
-
-    // register server commands in this event handler (Remove if not needed)
-    public void serverStarting(FMLServerStartingEvent event) {}
-}

src/main/java/com/myname/mymodid/Config.java

@@ -1,20 +0,0 @@
-package com.myname.mymodid;
-
-import java.io.File;
-
-import net.minecraftforge.common.config.Configuration;
-
-public class Config {
-
-    public static String greeting = "Hello World";
-
-    public static void synchronizeConfiguration(File configFile) {
-        Configuration configuration = new Configuration(configFile);
-
-        greeting = configuration.getString("greeting", Configuration.CATEGORY_GENERAL, greeting, "How shall I greet?");
-
-        if (configuration.hasChanged()) {
-            configuration.save();
-        }
-    }
-}

src/main/java/com/myname/mymodid/MyMod.java

@@ -1,46 +0,0 @@
-package com.myname.mymodid;
-
-import com.myname.mymodid.API.ReplacementManager;
-import cpw.mods.fml.common.Mod;
-import cpw.mods.fml.common.SidedProxy;
-import cpw.mods.fml.common.event.FMLInitializationEvent;
-import cpw.mods.fml.common.event.FMLPostInitializationEvent;
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import cpw.mods.fml.common.event.FMLServerStartingEvent;
-import net.minecraft.init.Items;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
-@Mod(modid = Tags.MODID, version = Tags.VERSION, name = Tags.MODNAME, acceptedMinecraftVersions = "[1.7.10]")
-public class MyMod {
-
-    public static final Logger LOG = LogManager.getLogger(Tags.MODID);
-
-    @SidedProxy(clientSide = "com.myname.mymodid.ClientProxy", serverSide = "com.myname.mymodid.CommonProxy")
-    public static CommonProxy proxy;
-
-    @Mod.EventHandler
-    public void preInit(FMLPreInitializationEvent event) {
-        ReplacementManager.addReplacement(Items.iron_ingot, 0, Items.bow, 10);
-        proxy.preInit(event);
-    }
-
-    @Mod.EventHandler
-    // load "Do your mod setup. Build whatever data structures you care about. Register recipes." (Remove if not needed)
-    public void init(FMLInitializationEvent event) {
-        proxy.init(event);
-    }
-
-    @Mod.EventHandler
-    // postInit "Handle interaction with other mods, complete your setup based on this." (Remove if not needed)
-    public void postInit(FMLPostInitializationEvent event) {
-        proxy.postInit(event);
-    }
-
-    @Mod.EventHandler
-    // register server commands in this event handler (Remove if not needed)
-    public void serverStarting(FMLServerStartingEvent event) {
-        proxy.serverStarting(event);
-    }
-}
-

src/main/java/com/myname/mymodid/Postea.java

@@ -0,0 +1,10 @@
+package com.myname.mymodid;
+
+import cpw.mods.fml.common.Mod;
+
+@Mod(modid = Tags.MODID, version = Tags.VERSION, name = Tags.MODNAME, acceptedMinecraftVersions = "[1.7.10]")
+@SuppressWarnings("unused")
+public class Postea {
+
+}
+

src/main/java/com/myname/mymodid/mixins/PosteaLoadingPlugin.java

@@ -1,7 +1,6 @@
 package com.myname.mymodid.mixins;
 
 import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
-import cpw.mods.fml.relauncher.FMLLaunchHandler;
 import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
 
 import java.util.ArrayList;
@@ -44,11 +43,7 @@ public final class PosteaLoadingPlugin implements IEarlyMixinLoader, IFMLLoading
     public List<String> getMixins(Set<String> loadedCoreMods) {
         final List<String> mixins = new ArrayList<>();
         mixins.add("MixinItemStack");
-        if (FMLLaunchHandler.side().isClient()) {
-            // register client only mixins here,
-            // that is mixins that target client classes
-            // such as net.minecraft.client.Minecraft class
-        }
+
         return mixins;
     }
 }