RoR isn't a language. It's an MVC framework that's good for websites (that is, web applications that have a lot of pages). It's overkill for APIs, transaction-heavy stuff, one-page apps, etc.
It's a baloney-ass straw man to set up Rails as weak when compared to Java. Rails is a limited web framework, and Java is a programming language.
Instead, you should compare Ruby or Python to Java for web development. If it's still your position that there aren't enough good open-source tools in Ruby or Python to do what you need, then I believe you're either looking very hard, or you're looking in the wrong places.
It's a baloney-ass straw man to set up Rails as weak when compared to Java. Rails is a limited web framework, and Java is a programming language.
Instead, you should compare Ruby or Python to Java for web development. If it's still your position that there aren't enough good open-source tools in Ruby or Python to do what you need, then I believe you're either looking very hard, or you're looking in the wrong places.