For those of us still using Java 8, ImmutableMap.of() (from Guava) is similar (and probably the inspiration for Map.of()), as long as you don't need your Map to be modified later.

We’re still using Java 8 in prod, because Java 9 broke our Hive version and a lot of other use cases for reflection (in return for modularizing stdlib, which we never cared about). I think some projects gave up on Java 9 as it neared EOL, and Java 11 compatibility still isn’t finished.