Failender

public void onUpdate(ItemStack itemstack, World worldIn, Entity entity, int itemSlot, boolean isSelected)

you dont need to search for the item, you get it passed as argument (int itemSlot)

player.mainInventory.setStackInSlot(randomIndex, itemstack); player.mainInventory.setStackInSlot(itemSlot, null);

while(true) int randomIndex=random.nextInt(maxIndex); if(inv.getSlot(randomIndex)==null) placeItemHereAndSetOtherOneNull(); //TODO: prevent infinite loop

You mean "rethink your life!" Oh Ernio..

if the new item is in a different slot simply set the old one to null

EntityPlayer player= (EntityPlayer) entity; if(entity instanceof EntityPlayer) Rethink this code please.

specify your question please sir

why do you want to have a custom inventory if you want to use the default vanilla? Instead of using ur own inventory just use the vanilla one (in case u are using a gui)

set the old slot where the itemstack was to null/replace it with the new one. java garbage collection will do the rest

The first argument of setInventorySlotContents is the index, not the stacksize.

if(held == new ItemStack(Items.bone)){ ItemStack out = new ItemStack(Items.iron_ingot); EntityItem entity = new EntityItem(world, player.posX, player.posY, player.posZ, out); world.spawnEntityInWorld(entity); } Im not sure what you are triing to do there. if(held.getItem()==Items.bone);

only create the explosion on server side (!if(world.isRemote))

No. Dont use event.getSide() , that is stuff proxies are made for.

you should consider fixxing those 200 other errors u got in ur log first..

fix ur code?

jesus christ what is up with that error log? try some basic debugging. u got a NPE in ur shouldExecute method, either theEntity or theEntity.getAttackTarget() is null

normally a check !world.isRemote will work . depends on where u call it

even winrar can edit jar files sir..

you want a hacky way? decompile it , add it to your workspace and compile ur mod with the library inside. i bet there are better ways

you only need to kill the entity on server side, client sid will get informed

okay, I guess that is the better solution :b

Create a new project, gradlew setupDecomp.. And setup eclipse after that copy ur source folder into the new project

just google "minecraft remove recipe" there is everything you need

that is correct.