Demonstrates how to create Java/Spring based microservices using modern approaches:

• Service Discovery (HashiCorp Consul)
• API Gateway (Spring Cloud Gateway)
• Client-side load-balancing (Spring Cloud LoadBalancer)
• OpenID Connect based user authentication (Spring Security/Keycloak)
• Distributed sessions (Spring Session/Redis)
• OAuth 2.0 scope based service-to-service authorization (Spring Security/Keycloak)
• Data caching (Spring Cache/Redis)
• Cloud Bus to broadcast cache invalidation notifications between microservices (Spring Cloud Bus/Apache Kafka)
• Database schema evolution (Liquibase)
• Java classes mapping (MapStruct)
• Distributed tracing (Spring Sleuth/Zipkin)
• Containerized microservices (Docker)
• Infrastructure as Code (HashiCorp Terraform)

• JDK 11
• Maven
• Docker
• Docker Compose
• Terraform

• Run under infrastructure directory

docker-compose up -d

• Run under infrastructure/terraform directory

source ./env.sh

• Run under infrastructure/terraform/0100-database directory

terraform init
terraform apply

• Run under infrastructure/terraform/0200-oidc directory

terraform init
terraform apply

• Run under infrastructure/terraform/0300-consul directory

terraform init
terraform apply

You can access some infrastructure services using the following addresses:

• Build and run microservices in api-gateway, messages-service and profiles-service directories

mvn -DskipTests spring-boot:run

• Build docker containers for microservices in api-gateway, messages-service and profiles-service directories

mvn -DskipTests clean package docker:build

• Start microservices containers

docker-compose up -d

Open in a browser the following URLs to see the inbox and outbox messages:

http://localhost:8080/api/messages/message/inbox
http://localhost:8080/api/messages/message/outbox

You will be redirected to the login page. Use one of the following users - victor.fisyuk, john.doe (use secret as password).

By default, there are no messages. You could send new messages using Postman collection postman_collection.json. You could also update user profiles using Postman.