[foobar_]

Java is definitely not free.

https://blog.joda.org/2018/09/do-not-fall-into-oracles-java-...

[outadoc]

The article specifically mentions Java 11.

I'm sure Jetbrains more than anybody knows about Java's licensing...

[foobar_]

Oracle is so supportive, free and open that it is suing Google for copying from a free software.

[outadoc]

Don't get me wrong, Oracle sucks, I know—but the article (kind of) acknowledges that and underlines that you don't have to do business with Oracle to use Java.