By the standards of the day, when Java was released it's standard library was pretty comprehensive: in addition to covering most of the c-ish stdlib, it had networking and web-aware apis.

It did set a new standard in a way that was very beneficial for the languages that came after it: you're not an ACTUAL language if you don't have a "good" standard library, and I can argue that "good" was defined by Java more than C++ or anything else at the time.

I also don't see any new languages, while more modernized, that have substantially pushed the envelope further to be the new gold standard of a minimum batteries included stdlib. All I could probably say is various threading/concurrency apis, but Java has added a lot of that too over the years.

Which falls under the heading of "mature dependency management system". Apache Commons (or Google Guava) is pretty much considered part of the standard library at this point, as they are so easy to include in projects.

What you say is true but at the same time its one of the very few languages to include an entire cross-platform UI-Framework in the stl.