I am confused.

Why this gives me NullPointer?

 

TileEntity tile = world.getTileEntity(x, y, z);

 

I intend to check null the next line, but then it crashed at that line.

Is world null?

I made world as this.worldObj

(This code is in a class extending from TileEntity)

You can use debugging mode in Eclipse to see what is going on. Or add a check for null with a console statement.

I cant find the errors!!!

I have all coordinates passing in legit.

 

(That should work!!!)

AND add before print in to console of all args (world, x, y, z), and come back with log...

I am attempting to update Forge first, just in case...

We cant help you if you dont show us anyhing. Just saiing. The chance that you get a NPE bc of forge isnt updated is really small.

K, here are more info:

 

Problematic function:

 

("world" is set to "worldObj", to make life easier)

(MultipleControllerException is a self-made Exception class. But I cant test its functionality because this code fails... and the Exception appear later in the code (which is not shown))

 

private void checkBound() throws MultipleControllerException {

for (int i=0; i<6; i++) {

ForgeDirection dir = ForgeDirection.getOrientation(i);

int x = dir.offsetX + xCoord;

int y = dir.offsetY + yCoord;

int z = dir.offsetZ + zCoord;

TileEntity tile;

// DEBUG

if (world.isRemote) {

Minecraft.getMinecraft().thePlayer.sendChatMessage("X: " + x);

Minecraft.getMinecraft().thePlayer.sendChatMessage("Y: " + y);

Minecraft.getMinecraft().thePlayer.sendChatMessage("Z: " + z);

Minecraft.getMinecraft().thePlayer.sendChatMessage("World: " + world);

}

tile = world.getTileEntity(x, y, z);

}

 

What the game printed:

(What the game gave me:)

can't even print anything.

 

Conclusion:

somehow the "world" variable failed.

 

(BTW, nice Forge loading GUI!!!)

WEIRD, now that it gave me some more info now:

 

[server thread/INFO]: <Player860> X: -225

[server thread/INFO]: <Player860> Y: 105

[server thread/INFO]: <Player860> Z: 237

[server thread/INFO]: <Player860> World: net.minecraft.client.multiplayer.WorldClient@59027d30

 

but still it crashed.

 

K, even more info:

 

public TEMCGController() {

this.world = this.worldObj;

}

 

It is getting more crazy.

Oh, what...

So where is the world initialised...?

 

So it may just be a program style issue...

So it may be just a program code-writing style issue...

 

Anyway it is kinda fixed for now.

So it may be just a program code-writing style issue...

 

No, that is not a "coding style" issue, it is a coding error: you are trying to assign something at a time when the assignment is either bad or at least unpredictable. That is a logical mistake and therefore wrong no matter what your coding style is.

 

Now it is understandable to make such a mistake -- when modding, the nuanced behavior of the Minecraft implementation is not always obvious.

 

It reminds me of someone who was trying to use the entity position in the constructor. Similarly, the position is not asssigned at that point, so using it would be wrong.