NPE from AutoScroller about artofillusion HOT 9 CLOSED

Can you clarify your instructions here? I have not been able to reproduce this exception...

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I have seen this a lot, but I did not pay attention to how it happened.

EDIT: Two ways of doing it

1. Click Objects Pane with Right MouseButton on the empty the area past the object list.
2. Click again with any button.

OR

1. Click Objects Pane with Right MouseButton on an object.
2. Click again with any button on the empty the area past the object list.

This pops the alert up. As a new symptom the NullPointer some times froze the UI entirely but that could be related to me trying to capture the event on video.

EDIT: I did not start debugging on what originally is null.... is it the selected object?

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null object is AutoScroller scrollThread which already nulled

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null object is AutoScroller scrollThread which already nulled

I get that it is the scroll thread that causes the exception, but I was wondering, why the AutoScroller is activated at all in a case, when there is nothig to scroll to? I mean the mouse is clicked on empty background. Is there a possibility to do the check, where the mouse click is detected?

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AutoScroller starts new thread on each mouseDown event of it's container component and releases it on mouseUp event.
The error occurs when control fires not paired mouseUp event

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Sorry, I'm still not seeing this, either in the terminal output or with the log plugin.

What versions of Java/OSes are you seeing it with?

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Two Windows 10 PCs, Java 8 on one of them and both Java 8 and 11 on one of them, AoI 3.0.3 and AoI 3.1.0 on the PC with both Javas. I've got the feeling that this has been there for a very long time.

And again: screen capture video + this --> UI freeze.

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See this on Windows 10 with java 8 and java 13. Not see on virtual mac with java 13

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Got it. Apparently windows-specific... (Did not show on ArchLinux, but did on Windows)

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