Support Request: I decompile IC2,but got errors

Dear_ICE · January 12, 2012 at 9:53 AM

I decompile IndustrialCraft 2 ,I want to develop the addon.
But got some errors when I start minecraft with eclipse.

Caused by: java.lang.NullPointerException
at net.minecraft.src.ItemStack.<init>(ItemStack.java:31)
at net.minecraft.src.ItemStack.<init>(ItemStack.java:26)
at net.minecraft.src.ic2.common.ItemScrapbox.addDrop(ItemScrapbox.java:117)
at net.minecraft.src.ic2.common.ItemScrapbox.<init>(ItemScrapbox.java:75)
at net.minecraft.src.mod_IC2.<clinit>(mod_IC2.java:243)
... 15 more

How to solve it ?

------------------------
My English is poor , sorry.

Alblaka · January 12, 2012 at 9:57 AM Official Post

If you can't fix NPEs by yourself, you REEEEALLY shouldn't be trying to create mods.

IC² is quite complex, probably MCP can't recompile it perfectly and will create some errors like this one. Fix them, create your mod, you can assume that a recompiled version of your mod will work fine with a original version of IC².

Player · January 12, 2012 at 10:52 AM Official Post

Try to stick to the API which is being distributed in source form. Feel free to request additional api features if you need them.

RawCode · January 13, 2012 at 3:40 PM

try{}catch{}expeption e{custom debug output};

mitchfizz05 · January 16, 2012 at 2:52 PM

If MCP can't recompile IC2, how do you do it?
And if you were to make a mod to go over IC2, how would you edit the stuff that IC2 already has (you can do that for private use can't you?)

Alblaka · January 16, 2012 at 5:37 PM Official Post

Quote from mitchfizz05

If MCP can't recompile IC2, how do you do it?

As mentioned, if you really can't do it with the API and are too lazy/ignorant to request whatever you need to be included into the API, you'll need to fix all decompilation issues within the code to make it recompileable again.

immibis · January 20, 2012 at 6:57 AM

I've run into this problem too. It happens because the decompiler breaks the order of the initializers in mod_IC2.java.
I fixed mine a much more tedious way, but this should work too, although I haven't tried it, and I don't know if other items have the same problem as well:

Open net.minecraft.src.mod_IC2
Find a line starting with "public static Item itemScrapBox"
Change that line so all it says is
Code
```
public static Item itemScrapBox;
```
Gol to the end of the file, and scroll up until you find a line starting with "itemArmorAlloyChestplate = "

Underneath that line, add

Code

itemScrapBox = (new ItemScrapbox(getItemIdFor("itemScrapbox", 29883), 159)).setItemName("itemScrapbox");