Microservices is an architectural style that divides an application into a pool of loosely coupled services that implement business requirements. Each microservice runs its process and communicates with lightweight mechanisms, and they are built around business capabilities and independently developed by fully automated deployment machinery. Microservices can be written in a variety of programming languages, and frameworks, and each service acts as a mini-application on its own. Java microservices are a set of software applications written in the Java programming language, designed for limited scope that work together to form a bigger solution.

Java microservices are typically built using frameworks such as Spring Boot, which allows microservices to start small and iterate fast. With Spring Boot’s embedded server model, developers can quickly create a new project with Spring Initializr and then package it as a JAR. Java microservices are useful for many use cases, especially those that involve an extensive data pipeline. For example, a microservices-based system would be ideal for a reporting system on a company’s retail store sales, where each step in the data preparation process would be handled by a microservice: data collection, cleansing, normalization, enrichment, aggregation, reporting, etc.

In summary, microservices is an architectural style that divides an application into a pool of loosely coupled services that implement business requirements. Java microservices are a set of software applications written in the Java programming language, designed for limited scope that work together to form a bigger solution. They can be built using frameworks such as Spring Boot and are useful for many use cases, especially those that involve an extensive data pipeline.