On Mon, 31 Jul 2023 17:39:29 GMT, Jose Pereda <jper...@openjdk.org> wrote:

>> This PR adds a check to the Animation and AnimationTimer public methods to 
>> verify that these are called from the JavaFX Application thread. If the call 
>> is done from any other thread, an IllegalStateException will be thrown.
>> 
>> This will prevent users from getting unexpected errors (typically NPE, like 
>> the one posted in the JBS issue), and will fail fast with a clear exception 
>> and reason for it.
>> 
>> The javadoc of the Animation and AnimationTimer classes and public methods 
>> has been updated accordingly.
>> 
>> Tests for both classes have been included, failing (as in no exceptions were 
>> thrown when calling from a background thread) before this patch, and passing 
>> (as in ISE was thrown).
>
> I've edited the title of the original JBS issue 
> https://bugs.openjdk.org/browse/JDK-8159048 to fix the typo.

@jperedadnr One more thing I noticed: the titles of the bug and the CSR should 
match (it's not enforced, but it a best practice). So you should either change 
the title of the CSR back to match the title of the bug -- "Null PulseReceiver 
in AbstractMasterTimer" -- or change the title of the bug, along with this PR 
title, to match the CSR. In looking at it, I think the CSR title is more 
descriptive, so I might suggest some variant of that. Here a slightly shortened 
suggestion:


Animation and AnimationTimer methods must be called on JavaFX Application thread


but what you have is fine as well.

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PR Comment: https://git.openjdk.org/jfx/pull/1167#issuecomment-1677358792

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