Crashing with NullPointerException

[rugged hedge]

I can't find the reason why I'm crashing with NullPointerException on method "slot.getHasStack()" because I've made a check to check if object "slot" is null, does someone know how I fix this?

[sick needle]

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[rugged hedge]

I think I have to learn how Java works 💀

[weary trout]

I guess java while trying to verify your slot reference encounter that it was null and just print out the exeption and terminate

use try-catch and with the catch you do nothing

something like:

 **your code** 
}catch(NullPointerException e){
**this code will execute if pointer is null**
}

[minor stream]

can you verify that it's actually on that line?

[minor stream]

it's generally not a good idea to catch unchecked exceptions, especially NullPointerExceptions as they are usually avoidable. if you want to check if a value is null, then you should use an if statement like the user is doing.

[sick needle]

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[rugged hedge]

the error message points actually to this method...

[cosmic ridge]

slot.getHasStack() itself is throwing the npe

[rugged hedge]

is this the problem?

[minor stream]

yep now you need to check if ItemStack returned from getStack is null

[rugged hedge]

?? how

[minor stream]

idk what that is. that seems different from the line showed previously

getHasStack will throw an NPE if getStack returns null

that's important to understand

[rugged hedge]

ok

[minor stream]

futhermore, if your inventory is null then getStack itself will throw an NPE

[rugged hedge]

I think like you said, something went wrong and inventory got null. I will look at it, thanks!

[sick needle]

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