Java Spring is at root a way to combine large software components (singletons) together in a controlled manner (dependency injection). It doesn't really have an opinion on what you do with it, or even if you use it for webapps. In fairness the Servlet API (which predates Spring) was and always has been really good (which is why it's still the foundation of everything webapp in the Java ecosystem). Oddly enough, logging in Java was a mess but became really good when slf4j and logback became the de facto standard. The OP's problem is trivial in Java, Spring, Spring Boot, or Dropwizard.

Java doesn't offer isomorphic React SSR, but in most cases that is a questionable feature. Most SPAs don't need or want search-engine indexing or require instantaneous-seeming load times.

That would be Nest, not Next. A true abomination.