Vert.x
Reactive toolkit for building event-driven applications on the JVM — polyglot, non-blocking, and massively scalable.
Vert.x is built on a non-blocking event loop model — a single thread handles thousands of concurrent connections without thread-per-request overhead. It is polyglot by design and runs Java, Kotlin, Groovy, JavaScript, Scala, and Ruby code on the same event bus. Used at Red Hat, Hulu, and in high-throughput financial systems.
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backendjavareactiveevent-drivennon-blockingpolyglotmicroservices