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User service has REST API endpoints to save and get a user
User service brings a department information from the Department Service using Open Feign framework

EmailService sends an email

1. Dependencies
   • spring-boot-starter-mail
   • spring-cloud-starter-netflix-eureka-client
   • spring-cloud-config-client
2. Properties
   • Application name
   • Config server
   • Configure endpoint exposure for refresh
   • Eureka server
   • Use port 8083
   • SMTP host, port, credentials, properties
3. Service Layer
   • Send a mail using the JavaMailSender bean

Department service requires REST API to create and get a department

Add Config Server with Spring Cloud Config Server and Spring Boot Actuator dependencies

Add dependencies
Enable Eureka client
Add Eureka and Gateway routes properties

Create Authentication Service to generate an OAuth2 access token and to validate it
Add Spring Security OAuth2 clients in services

Use Netflix Eureka Server
Set up services as eureka client

Add module projects of components, Client, API Gateway, Service Registry, Config Server, Authorization Service, User Service and Department Service

Sending an email from UserService to EmailService asynchronously using Apache Kafka Message broker

1. Producer

   1. Dependencies
      • Kafka
   2. Properties
      • Topic name
      • Producer
   3. DTO
      • User, UserEvent
   4. Configuration
      • Kafka Topic bean
   5. Service
      • Send a message to Message Broker
   6. Controller
      • Send a message using the Service layer

2. Consumer

   1. Dependencies
      • Kafka
   2. Properties
      • Topic name
      • Consumer
   3. DTO
      • User, UserEvent
   4. Service
      • Receive a message from Message Broker