Fix #31, fix #32, as well as some other potential issues on dedicated servers

src/main/java/malte0811/industrialWires/blocks/TileEntityIWBase.java

@@ -21,6 +21,8 @@ import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.network.NetworkManager;
 import net.minecraft.network.play.server.SPacketUpdateTileEntity;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 
 import javax.annotation.Nonnull;
 
@@ -54,6 +56,7 @@ public abstract class TileEntityIWBase extends TileEntity {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt) {
 		super.onDataPacket(net, pkt);
 		readNBT(pkt.getNbtCompound(), true);

src/main/java/malte0811/industrialWires/items/ItemIC2Coil.java

@@ -45,6 +45,8 @@ import net.minecraft.util.math.Vec3d;
 import net.minecraft.util.math.Vec3i;
 import net.minecraft.util.text.TextComponentTranslation;
 import net.minecraft.world.World;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -92,8 +94,8 @@ public class ItemIC2Coil extends Item implements IWireCoil {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void addInformation(ItemStack stack, @Nullable World worldIn, List<String> tooltip, ITooltipFlag flagIn) {
-
 		tooltip.add(I18n.format(IndustrialWires.MODID + ".desc.wireLength", getLength(stack)));
 		IC2Wiretype wireType = IC2Wiretype.ALL[stack.getMetadata()];
 		int transferRate = wireType.getTransferRate();

src/main/java/malte0811/industrialWires/items/ItemKey.java

@@ -28,6 +28,8 @@ import net.minecraft.nbt.NBTTagList;
 import net.minecraft.nbt.NBTTagString;
 import net.minecraft.util.*;
 import net.minecraft.world.World;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -50,6 +52,7 @@ public class ItemKey extends Item implements INetGUIItem {
 
 	@Nonnull
 	@Override
+	@SideOnly(Side.CLIENT)
 	public String getItemStackDisplayName(@Nonnull ItemStack stack) {
 		NBTTagCompound nbt = stack.getTagCompound();
 		if (nbt!=null&&nbt.hasKey(NAME)&&!nbt.getString(NAME).trim().isEmpty()) {
@@ -59,6 +62,7 @@ public class ItemKey extends Item implements INetGUIItem {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void addInformation(ItemStack stack, @Nullable World worldIn, List<String> tooltip, ITooltipFlag flagIn) {
 		super.addInformation(stack, worldIn, tooltip, flagIn);
 		if (stack.getMetadata()==2&&stack.getTagCompound()!=null) {

src/main/java/malte0811/industrialWires/items/ItemPanelComponent.java

@@ -69,6 +69,7 @@ public class ItemPanelComponent extends Item implements INetGUIItem {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void addInformation(ItemStack stack, World world, List<String> list, ITooltipFlag flag) {
 		if (GuiScreen.isShiftKeyDown()) {
 			NBTTagCompound nbt = getTagCompound(stack);

src/main/java/malte0811/industrialWires/network/MessageItemSync.java

@@ -17,7 +17,6 @@ package malte0811.industrialWires.network;
 
 import io.netty.buffer.ByteBuf;
 import malte0811.industrialWires.items.INetGUIItem;
-import net.minecraft.client.Minecraft;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
@@ -54,7 +53,8 @@ public class MessageItemSync implements IMessage {
 	public static class HandlerServer implements IMessageHandler<MessageItemSync, IMessage> {
 		@Override
 		public IMessage onMessage(MessageItemSync message, MessageContext ctx) {
-			Minecraft.getMinecraft().addScheduledTask(()-> {
+			ctx.getServerHandler().player.getServerWorld()
+					.addScheduledTask(()-> {
 				EntityPlayer player = ctx.getServerHandler().player;
 				ItemStack held = player.getHeldItem(message.hand);
 				if (held.getItem() instanceof INetGUIItem) {