A modern programming language that makes developers happier.

kotlinlang

I did, they are very low level and incosistent. In fact, python is probably the only language which has good high-level bindings for hdf5. We refused to use it because of that.

I really start to get the feeling that Java world is loosing it…

In this case it is not the Java world. HDF is bulky and rather obsolete. There are significantly better formats like parquet.

I agree about visualization, but Python is loosing it as well. All visualization is in JS nowadays and you can access it from java as easily as from python.