Spring-Boot - Ports-And-Adapters / Hexagonal Architecture with DDD

Overview

An example of a Spring-Boot application, which based on the port and adapters/hexagonal architecture and DDD.

Build Status	License

Prerequisites for development

• Git
• JDK 17
• Maven
• Docker Desktop

Implementing a new adapter

In the application the whole component scan for the adapter package is excluded, so the unnecessary adapter beans won't be loaded into the application context, just the configured ones. Each adapter defines her own spring configuration class, which is imported via the @Import annotation (on top of the application's main class) but only those get component scanned where the condition(s) fulfills for it via @ConditionalOnProperty annotation.

Based on the below example if you define "spring-data-jpa" value as a persistence adapter in the application-[profile].yml, then it will activate the corresponding Configuration class, which is going to component scan the underlying packages for spring beans.

Example

@Configuration
@EnableJpaRepositories
@ComponentScan
@ConditionalOnProperty(
        value = "adapter.persistence",
        havingValue = "spring-data-jpa"
)
public class JpaPersistenceConfiguration {

}

application-[profile].yml

adapter:
  authentication: basic
  persistence: spring-data-jpa
  messaging: spring-event-bus
  web: rest

Build and test with Maven

mvn clean verify

**Building and verifying the application requires a running docker, since some tests are using Testcontainers library!

Test catalog and Maven lifecycle bindings

Test catalog type	Maven lifecycle
Unit test	test
Component test	test
ArchUnit test	test
Integration test	verify
Functional test	verify

API Documentation

You can access the API documentation locally at the following URL:

http://localhost:8080/swagger-ui/index.html