Java stagnated for quite a while. Seemed like everyone was stuck on Java 6 for about a decade. But JDK8 was a huge step forward. Lambdas, streams, and a date/time API that is the best I've seen.

I think DotNet had a bit of benefit, in that the language was still new enough to do the hard breakage. It was only about 3.5 years between NET1.0 and 2.0 (Where generics were added.)