Yeah, and I've already come across most of those. Integrating lots of that stuff into the standard libraries that Java ships with would be exactly what I'm thinking of...and jettisoning all the broken GUI frameworks and such. And cleaning up the disaster pile that is I/O. I mean, I think there's still stuff sitting around in javax.* from when I last touched Java 14 years ago. I thought that was supposed to be the experimental branch where things might change without warning? Let's clean that up.
I know most IDEs just ship with all that stuff included, but I've found it makes packaging up things to give to somebody else a little more complicated than I'd like...which would be resolved in the standard libraries.