My title is too long to say solved but this has been solved!

 

Here's a larger report

Description: Ticking entity

java.lang.RuntimeException: java.lang.NoSuchFieldException: sleepTimer
at com.google.common.base.Throwables.propagate(Throwables.java:160)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:144)
at cpw.mods.fml.common.FMLCommonHandler.onPlayerPreTick(FMLCommonHandler.java:345)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:220)
at net.minecraft.client.entity.EntityClientPlayerMP.func_70071_h_(SourceFile:63)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1995)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoSuchFieldException: sleepTimer
at java.lang.Class.getDeclaredField(Unknown Source)
at wintercraft.helper.PlayerTickHandler.serverTick(PlayerTickHandler.java:33)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_7_PlayerTickHandler_serverTick_PlayerTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
... 16 more


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

-- Head --
Stacktrace:
at com.google.common.base.Throwables.propagate(Throwables.java:160)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:144)
at cpw.mods.fml.common.FMLCommonHandler.onPlayerPreTick(FMLCommonHandler.java:345)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:220)
at net.minecraft.client.entity.EntityClientPlayerMP.func_70071_h_(SourceFile:63)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.World.func_72870_g(World.java:2034)

-- Entity being ticked --
Details:
Entity Type: null (net.minecraft.client.entity.EntityClientPlayerMP)
Entity ID: 156
Entity Name: gruntpie224
Entity's Exact location: 8.50, 66.62, 8.50
Entity's Block location: World: (8,66,, Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1887)

 

My mod works when it runs from eclipse just not when I use the gradlew build and then use the jar it puts out. The game starts up fine but when I try to create a new world I get that error. It may have something to do with this, more than likely, but I don't get why it works in eclipse:

@SubscribeEvent
public void serverTick(PlayerTickEvent event) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException{	
	EntityPlayer player = event.player;
	Random generator = new Random();

	Field f = EntityPlayer.class.getDeclaredField("sleepTimer");
	f.setAccessible(true);//Very important, this allows the setting to work.
	int sleepTimer = (Integer) f.get(player);

	/////not relevant code/////
}

You have to use the srg name. You can find them in the gradle cache.

 

Also, you should the ReflectionHelper class, it makes code a lot cleaner. For example:

try
{
    Field field = SomeClass.class.getDeclaredField("someField");
    field.setAccessible(true);
    Object value = field.get(someClassInstance);
}
catch (ReflectiveOperationException e)
{
    //Repeat with srg name
}

 

Turns to:

Object value = ReflectionHelper.getPrivateValue(SomClass.class, someClassInstance, "someField", "srgName");

Thanks! I got it working