It is generally recommended to use the latest JDK update release of one of the by NetBeans supported JDK versions. The supported versions can change from NetBeans release to release, the up to date list can be found on the download page of the release and on the readme of the source bundle.

The launcher will try to set the best settings based on the OS you are running NetBeans on.

Ugly Wrong Sized Fonts in Terminal

Sometimes Terminal could really present interesting display experiences.

Solution:

Try the latest NetBeans release since this was fixed via https://github.com/apache/netbeans/pull/6163