So, I have a mod where you get an item that you can put in your crafting table and get a random item. As the game starts, it goes through all the registered items and adds them and their sub items to a list that the game looks through when you put the item in the crafting table. My current problem is that getSubItems doesn't exist server side, so it crashes the server. I can't think of any way around this, and help would be greatly appreciated.

 

Here is the code that finds all registered items:

 

try
        {
            Field creativeTabField = null;
            
            for (Field field : Item.class.getDeclaredFields()) //Since getCreativeTab() is @SideOnly(Side.CLIENT)
            {
                if(field.getType() == CreativeTabs.class)
                {
                    field.setAccessible(true);
                    creativeTabField = field;
                    break;
                }
            }
            
            for (Object object : Item.itemRegistry.getKeys())
            {
                Item item = (Item) Item.itemRegistry.getObject((String) object);
                
                CreativeTabs tab = (CreativeTabs) creativeTabField.get(item);
                
                if(tab != null)
                {
                    List<ItemStack> subtypes = new ArrayList<ItemStack>();
                    
                    if(item.getHasSubtypes())
                    {
                        try
                        {
                            item.getSubItems(item, tab, subtypes);
                        }
                        catch (Exception e)
                        {
                            System.err.println("Error while finding subitems for " + item.getUnlocalizedName() + "!");
                            e.printStackTrace();
                        }
                    }
                    else
                    {
                        subtypes.add(new ItemStack(item, 1, 0));
                    }
                    
                    for (ItemStack subtype : subtypes)
                    {
                        possibleItems.add(new RandomItem(subtype.getItem(), subtype.getItemDamage()));
                    }
                }
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

And here is the mod: http://www.planetminecraft.com/mod/randomite-mod/

 

You simply can't. You have to hard-code it.

That's unfortunate, because then it would be incompatible with other mods...

Nothing you can do about it unfortunately.

I was thinking about sending packets from the client to the server, but firstly that would be quite inefficient and secondly the client could have some mods that the server doesn't.. (Although you could check on the server)