Long hang times in r2021b - mtree?

I recently upgraded from R2018a to R2021b, sometimes (spontaneously, also can spontaneously resolve) it can have extremely long hang times when running code in a script and more likely when 'Executing selection'.

This doesn't go away with exiting/restarting matlab, using the default path, or turning off Code Analyzer. If I run simple code (e.g. a = 4; disp(a(1))) with tic/toc the computation time is as expected but the time to actually finish execution is many seconds. If I run longer code I can ctrl-c to stop execution and it always errors with :

Operation terminated by user during mtree (line 132)

In matlab.unittest.internal.ui.toolstrip.getFileInfoForToolstrip (line 29)

parseTree = mtree(file,'-file');

Is there something in r2021 that's causing this issue?

[DGM]

It doesn't look like you're alone:

https://www.mathworks.com/matlabcentral/answers/1597269-matlab-2021b-run-section-not-responsive

A lot of things changed with R2021b.

[mark]

Same here. This is killing productivity. Any updates?

[Andrew Peters]

I upgraded to R2022a and haven't experienced it since then - maybe it's been fixed?

[mark]

Same behavior in 2022a for me unfortunately.

Answer 1

[Adrianus Johannes van der Pijl]

Had the same problem, for me it was a bug in Java. See:

https://nl.mathworks.com/matlabcentral/answers/276006-how-to-solve-the-error-exception-in-thread-awt-eventqueue-0-java-lang-illegalargumentexception-c#answer_216077

and

https://www.oracle.com/java/technologies/downloads/#jdk18-windows

[mark]

Thanks, this didn't seem to change anything unfortunately.