As someone who has extensive Java and JavaScript experience, the whole reason for the Java hate as a language is it's lack of closures. For any callback you have define a new interface explicitly then do a gnarly anonymous inner class. In JavaScript you can just plop in an anonymous function. As for the ecosystem, Node also wins with NPM for ease of installing third party libraries, but Java wins for more comprehensive libraries that are already battle tested. A lot of Node libraries do reinvent the wheel.

I don't even know what the standard way of installing a new library is in Java. There's Ivy, Maven, and Gradle. Out of all of them Gradle seems to be the best, but least used.