Weird java text in command window

Something weird happens to Matlab, I get this red text in the command window and it keeps changing whenver I move the mouse. Any Idea?

[Walter Roberson]

The message hints you are using MacOS ? Which OS release?

(You tagged that you are using R2018b -- thank you for providing that information!)

[Jan]

Don't move the mouse.

Sorry, I could not resist.

When did this start? Directly after installing Matlab or was it an update of the Java runtime? Did you upgrade the OS or Matlab before?

[Romio]

Mine is macOS Catalina 10.15.6.

It started a couple of days ago. I do not recall that I updated either matlab or OS. I tried restarting matlab and computer but still appears every time I re-open matlab. It is really anoyying :(

[Walter Roberson]

Note that R2018b is not officially supported on MacOS Catalina; R2018b support tops at at Mojave.

MacOS Catalina had a security update three days ago, December 14th; https://support.apple.com/en-ca/HT212011

[Romio]

Just did the update or Catalina, and problem still the there:(

Also, I made a mistake. My Matlab version is R2018a. Do you think deleting matlab and reinstalling it could solve the problem? Do I have to worry about anything if want to do so?

Thanks for your help by the way!

[Romio]

Also if someone knows a way to metigate the problem somehow, please let me know. I mean something in the settings that could for example suppress this stream of output in the command window.

[Walter Roberson]

R2018a was last supported on High Sierra. It is known not to work properly on Mojave or later if your Locale is not set to en-US (US English)

Answer 1

[Cris LaPierre]

Restart MATLAB.

[Romio]

Already did but it sill is there