Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can 'just run'. It takes an opinionated view of the Spring platform and third-party libraries so you can get started with minimum configuration.

Spring Boot auto-configuration attempts to automatically configure your Spring application based on the jar dependencies that you have added.

Core starter, including auto-configuration support, logging and YAML

Spring Boot Developer Tools

Spring Boot Test

Spring Boot Actuator

Spring Boot Properties Migrator

Spring Boot Actuator AutoConfigure

Spring Boot Test AutoConfigure

The contract module is a container for interfaces, or contracts between implementations and implementation consumers

The core module is a wrapper around the BPMN engine, allowing you to launch and control business process models