Introduction to Reactive Programming in Java

Manpreet Singh
3 min readApr 23

Reactive programming is a programming paradigm that is focused on asynchronous data streams and the propagation of changes through those streams. Reactive programming provides a way to handle events in a more efficient and elegant way by allowing developers to write code that reacts to data as it becomes available, rather than waiting for it to be ready.

In Java, Reactive programming is implemented through the Reactive Streams specification, which provides a common API for reactive programming in Java. The Reactive Streams API is based on four core interfaces: Publisher, Subscriber, Subscription, and Processor. These interfaces define how data streams are published, consumed, and transformed by reactive applications.

One of the key benefits of Reactive programming is its ability to handle large amounts of data in real-time. This makes it an ideal choice for applications that require high throughput and low latency, such as financial trading systems, social media platforms, and real-time analytics.

Java libraries

There are several popular libraries for reactive programming in Java. Here are some of the most widely used ones:

  1. Reactor: Reactor is a popular reactive programming library for Java that provides a simple and intuitive programming model for working with streams of data. It is widely used in enterprise applications and has a large and active community.
  2. RxJava: RxJava is a popular implementation of the ReactiveX library for Java. It provides a set of APIs for working with streams of data, and it is widely used in Android development and other Java-based applications.
  3. Akka: Akka is a toolkit and runtime for building highly concurrent, distributed, and fault-tolerant systems using the Actor model. It provides a powerful set of APIs for working with reactive streams of data, and it is widely used in enterprise and financial applications.
  4. Vert.x: Vert.x is a lightweight and scalable toolkit for building reactive applications on the JVM. It provides a set of APIs for building reactive systems, including a reactive web server, an event bus, and support for reactive streams.
  5. Spring WebFlux: Spring WebFlux is a reactive web framework that…
Manpreet Singh

Software developer who loves writing about programming, technology, passive income strategies etc.