Java.lang.NullPointerException - ComputerCraft Forums (archive)

Hydrotronics #1

Hydrotronics's profile picture

173 posts

Location The hall of 1000 monkeys and only 1 typewriter

Posted 28 October 2016 - 03:38 PM

So this is the error I'm getting with my code.
My code is designed to add a series of functions that enable you to run programs across multiple screens.

So far, I wrote a function which allows you to draw images from paintutils.loadImage() across multiple screens.
This has worked with most monitor sizes, but with an 8x4 screen it throws "Java.lang.NullPointerException"

This is what I have called:


mov.draw("test",11,11,"monitor_1","monitor_2")

Could you help me understand where this is coming from?

Thanks in advance!

TYKUHN2 #2

TYKUHN2's profile picture

212 posts

Location Somewhere in this dimension... I think.

Posted 28 October 2016 - 08:13 PM

Sounds like a bug. Scan through the known bug list for your version of ComputerCraft.

KingofGamesYami #3

3057 posts

Location United States of America

Posted 28 October 2016 - 08:34 PM

It could be related to term.redirect. But I wouldn't expect that result.

Bomb Bloke #4

Bomb Bloke's profile picture

7083 posts

Location Tasmania (AU)

Posted 29 October 2016 - 02:20 AM

KingofGamesYami, on 28 October 2016 - 08:34 PM said:
It could be related to term.redirect.

That's my guess - line 34 attempts to redirect to "restore", which may well be a nil value. It, and line 37, could be re-written to read as:

if restore then term.redirect(restore) else term.restore() end

I'm also not much liking the logic of line 18 - why add t1y and t2y, given that your monitors can only touch along one edge at a time?

jakejakey #5

96 posts

Posted 13 November 2016 - 02:15 PM

LemonJelly, on 28 October 2016 - 03:38 PM said:
-snip-

What I feel you are trying to accomplish here is very tedious, I don't recommend you keep redirecting around between terms. Just wrap one as a peripheral and then make your own drawing function to draw the square