i am trying to make afree flight jetpack but on landong i get fall damage why?

 

package enderCraft;

import java.util.EnumSet;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;

import org.lwjgl.input.Keyboard;

import cpw.mods.fml.common.ITickHandler;
import cpw.mods.fml.common.TickType;

public class Tickjetpack implements ITickHandler{
public int tickpnumber = 0;
public int isjactive = 0;
public int isfull = 0;
@Override
public void tickStart(EnumSet<TickType> type, Object... tickData)
{
}
@Override
public void tickEnd(EnumSet<TickType> type, Object... tickData)
{
if(type.equals(EnumSet.of(TickType.RENDER)))
{
onRenderTick();
}
else
if(type.equals(EnumSet.of(TickType.CLIENT)))
{
Minecraft mc = Minecraft.getMinecraft();
GuiScreen gui = mc.currentScreen;
if(gui != null)
{
onTickInGui(mc, gui);
}
else
{
onTickInGame(mc);
}
}
}
private void onTickInGame(Minecraft minecraft)
{	

	tickpnumber++;
	if (minecraft.thePlayer.inventory.armorItemInSlot(2) != null)
    {
		System.out.println("Armor ON");
        	System.out.println(tickpnumber);
		minecraft.thePlayer.fallDistance = 0.0F;





        ItemStack itemstack = minecraft.thePlayer.inventory.armorItemInSlot(2);
        
        if (itemstack.itemID == Main.enderjetpack.shiftedIndex)
        {
        	
        	isjactive = tickpnumber;
        	
        	
        	if(minecraft.thePlayer.inventory.hasItem(Item.coal.shiftedIndex)){
        		
        		
        		
        			if(minecraft.theWorld.isRemote){
        				if(isjactive == 200 && isfull == 0){
        		minecraft.thePlayer.addChatMessage("Jetpack at full power");
        		isfull++;
        				}
        		}
        		
        			
        		if(isjactive == 200 && minecraft.thePlayer.capabilities.allowFlying == false){
        			
	        		minecraft.thePlayer.capabilities.allowFlying = true;
	        		minecraft.thePlayer.capabilities.isFlying = true;
	        		tickpnumber = 0;
        		}
        		
        		
        	}else{
        		if(tickpnumber == 200){
        		if(minecraft.theWorld.isRemote){
        		minecraft.thePlayer.addChatMessage("Unexpected error!!Do you have fuel?");
        		}
        		}
        		minecraft.thePlayer.capabilities.allowFlying = false;
        		minecraft.thePlayer.capabilities.isFlying = false;
        		if(isjactive == 400){
        		isjactive = 0;
        		tickpnumber = 0;
        	}
        	}
        	
        	
        }else{
        		if(minecraft.theWorld.isRemote && tickpnumber == 160){
        		minecraft.thePlayer.addChatMessage("You took off your jetpack");
        		}
        		minecraft.thePlayer.capabilities.allowFlying = false;
        		minecraft.thePlayer.capabilities.isFlying = false;
        		tickpnumber = 0;
        }
        
        
    }
}

private void onTickInGui(Minecraft minecraft, GuiScreen gui)
{

}
private void onRenderTick()
{

}
@Override
public EnumSet<TickType> ticks()
{
return EnumSet.of(TickType.CLIENT, TickType.RENDER);
}
@Override
public String getLabel()
{
return "TickHandler.CLIENT";
}
}

I am new at moding but maybe you could make your Jetpack add feather falling to the player.

@ForgeSubscribe
public void onEntityDammage(LivingHurtEvent event)
{
    if (event.entity instanceof EntityPlayer && event.source == DamageSource.fall && event.isCancelable())
    {
        if(((EntityPlayer)event.entity).inventory.armorInventory[1] instanceof YourJetpack)
        {
            if(((YourJetpack)((EntityPlayer)event.entity).inventory.armorInventory[1]).getIsOn())
            {
                event.setCanceled(true)
            }
        }
    }
}

this assumes that the jetpack is worn on the chest, that the Class<? extends Item> has a method called getIsOn() that returns true if the jetpack is on, and that the Class<? extends Item>.class== YourJetpack.class

 

Edit: Chibill: FeatherFall only goes on boots

@ForgeSubscribe
public void onEntityDammage(LivingHurtEvent event)
{
    if (event.entity instanceof EntityPlayer && event.source == DamageSource.fall && event.isCancelable())
    {
        if(((EntityPlayer)event.entity).inventory.armorInventory[1] instanceof YourJetpack)
        {
            if(((YourJetpack)((EntityPlayer)event.entity).inventory.armorInventory[1]).getIsOn())
            {
                event.setCanceled(true)
            }
        }
    }
}

this assumes that the jetpack is worn on the chest, that the Class<? extends Item> has a method called getIsOn() that returns true if the jetpack is on, and that the Class<? extends Item>.class== YourJetpack.class

in which class do i put this in the tick handler or in a new class?

The @Mod is where I put all of the @ForgeSubscribe methods

a simple way would be to add a crafting manager and when the jetpack is crafted it is given the enchant featherfalling X

or you could do

while(ForgeHooks.onLivingUpdate(player)){

        player.fallDistance=0;

}

The @Mod is where I put all of the @ForgeSubscribe methods

 

i did it but i cant get rid of teh eclipse errors