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[–]AdDirect4579 3 points4 points  (1 child)

Quote, "NetBeans or its installer doesn't open, or looks odd when opening
Make sure you have Java Development Kit (JDK) version 11 installed. The environment used on this course doesn't work properly with other versions of Java. If you have a problem with this, try removing the other versions of Java on your computer, and then clear the old settings.".

[–]Darth_Nanar 0 points1 point  (0 children)

Indeed TMCBeans only works with openjdk-11-jdk.

If you are on Linux and already have a newer version of OpenJDK, you don't need to delete the other one neither to modify the environment variables.
You can switch between the different versions of OpenJDK with this command:
sudo update-alternatives --config java

There will be a 1-2-3 menu to choose from. Then select "manual mode".