Upon exporting my mod, and placing it into a server, I'm getting a peculiar error. While singleplayer works perfectly fine, the server throws:

Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP

This seems to suggest that my registration code is client side ony, but what is the server-side packet channel registration code?

Here's the line throwing the error:

PacketHandler.channels = NetworkRegistry.INSTANCE.newChannel("BetterRecords", new ChannelHandler());

It is currently under FMLInitializationEvent.

 

Any help is greatly appreciated as this is the last thing I need before I may release said mod.

 

Unless you give us the full crash, we can't help you.

Sorry bout that, here ya go.

 

[spoiler=Crash Report]

---- Minecraft Crash Report ----
// I just don't know what went wrong 

Time: 7/23/14 4:10 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP
    at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
    at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
    at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)
    at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:318)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:187)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
    at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:669)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP
    at com.codingforcookies.betterrecords.src.BetterRecords.init(BetterRecords.java:56)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:622)
    at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:622)
    at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
    at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
    at com.google.common.eventbus.EventBus.post(EventBus.java:267)
    at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)
    at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:622)
    at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
    at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
    at com.google.common.eventbus.EventBus.post(EventBus.java:267)
    at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
    at cpw.mods.fml.common.Loader.initializeMods(Loader.java:690)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityClientPlayerMP
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
    ... 33 more
Caused by: java.lang.NullPointerException


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.7.2
    Operating System: Linux (i386) version 2.6.32-042stab084.17
    Java Version: 1.6.0_32, Sun Microsystems Inc.
    Java VM Version: OpenJDK Server VM (mixed mode), Sun Microsystems Inc.
    Memory: 879346272 bytes (838 MB) / 1029046272 bytes (981 MB) up to 1029046272 bytes (981 MB)
    JVM Flags: 2 total; -Xmx1024M -Xms1024M
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v9.03 FML v7.2.211.1121 Minecraft Forge 10.12.2.1121 4 mods loaded, 4 mods active
    mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
    FML{7.2.211.1121} [Forge Mod Loader] (forge.jar) Unloaded->Constructed->Pre-initialized->Initialized
    Forge{10.12.2.1121} [Minecraft Forge] (forge.jar) Unloaded->Constructed->Pre-initialized->Initialized
    betterrecords{1.0.12} [better Records] (betterrecords-1.0.12.jar) Unloaded->Constructed->Pre-initialized->Errored
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

 

 

I commented this out and tried it ont he server-side, and it worked. Turns out I had to make a function that was set to @SideOnly that returns the player for client side.

 

packet.readBytes(data);
        switch(FMLCommonHandler.instance().getEffectiveSide()) {
        case CLIENT:
            packet.executeClient(getClient()); //packet.executeClient(Minecraft.getMinecraft().thePlayer);
            break;
        case SERVER:
            INetHandler netHandler = ctx.channel().attr(NetworkRegistry.NET_HANDLER).get();
            packet.executeServer(((NetHandlerPlayServer)netHandler).playerEntity);
            break;
        }

 

Thanks for the help!