C'mon, this benchmark properly benchmark how fast languages are at certain tasks, the library used doesn't matter, the task however matter

A framework is not representative of a language performance, it is representative of the framework's performance, they might not use newest language features, they might use outdated dependencies, developer might have wrote poor code, they might have bugs

because you should really look into these frameworks if you really think its a good comparsion. if you exclude all the unserious java frameworks you will be stuck with vertx, after that there is a huge list of c# and than there is the rest of java. I mean yes, these frameworks might be the next big thing in the java world, but once they are there, they will at least loose 20% of performance. (p.s. you can also remove the first c# entry, because no sane person will write everything as a middleware)