Also a great disadvantage with JavaScript being the official scripting language of the web so it needs to work in every browser, but not every browser will implement it the same way. Syntax between the browser and servers also gets conflated.
I've done frontend development in Java and it sucks major ass. The "advantage" of using one language for the whole project really ended up as a net negative. For any server-side project I'm totally fine using Java because for all it's verbosity it's secure, performant, and examples from 10 years ago aren't useless.