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31 July 2020 - Comet Registration video tutorial using APP 1.083-beta1 released.

30 July 2020 - APP 1.083-beta1 has been released introducing Comet processing! This 1st beta has comet registration. The stable release will also include special comet integration modes.

9 July 2020 - New and updated video tutorial using APP 1.081: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse (iTelescope.net) and Mabula Haverkamp

2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!

NullPointerException in BackgroundModellerTask  

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(@pieterjand)
Hydrogen Atom Customer
Joined: 1 year ago
Posts: 2
August 20, 2019 21:36  

Hi,

Last night I ran APP 1.074.1 on my data. This morning I looked at the result and this exception popped up:

image

Steps 0-6 were finished and didn't have any issues.
I was opening the integration result image and used the DDP dropdown menu to switch between stretched previews.
If I remember correctly I was opening a different image while the DDP change was still loading in the background (or vice versa).

My guess would be that this is a concurrency issue.
I could not reproduce it, but an extra null check never hurts 😉

Kind regards,
Pieterjan

This topic was modified 12 months ago 2 times by Pieterjan Deconinck

(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2128
August 20, 2019 21:50  

I see you have some programming experience. I agree. 🙂


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(@pieterjand)
Hydrogen Atom Customer
Joined: 1 year ago
Posts: 2
August 20, 2019 22:19  

I have 🙂

If you need more information let me know.
The log didn't contain anything useful concerning the issue, so I hope the (rather minor) stacktrace will be enough.


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2128
August 21, 2019 10:43  

I let Mabula know so I'm sure he'll have a look at it. Thanks!


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(@mabula-admin)
Quasar Admin
Joined: 3 years ago
Posts: 2456
August 23, 2019 20:14  
Posted by: @pieterjand

Hi,

Last night I ran APP 1.074.1 on my data. This morning I looked at the result and this exception popped up:

image

Steps 0-6 were finished and didn't have any issues.
I was opening the integration result image and used the DDP dropdown menu to switch between stretched previews.
If I remember correctly I was opening a different image while the DDP change was still loading in the background (or vice versa).

My guess would be that this is a concurrency issue.
I could not reproduce it, but an extra null check never hurts 😉

Kind regards,
Pieterjan

Hi Pieter Jan @pieterjand ,

Thank you for sharing this issue. Yes I think it is a concurrency issue indeed...

I will have a look if I can fix this 😉

Mabula


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