Entry Point

Main Application Class

The service entry point is AryaBankingUserServiceApplication.java. It uses several annotations to wire together the platform-standard features.

@SpringBootApplication(exclude = {
    DataSourceAutoConfiguration.class,
    DataSourceTransactionManagerAutoConfiguration.class,
    HibernateJpaAutoConfiguration.class
})
@ComponentScan(basePackages = {"org.arya.banking.user", "org.arya.banking.common"})
@EnableMongoAuditing
@EnableDiscoveryClient
@EnableAspectJAutoProxy
@EnableFeignClients(defaultConfiguration = OAuth2FeignConfig.class)
public class AryaBankingUserServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(AryaBankingUserServiceApplication.class, args);
    }
}

Configuration Breakdown

1. JPA Exclusion

Since this service uses MongoDB exclusively, all JDBC/Hibernate auto-configurations are disabled to prevent startup failures.

2. Component Scanning

The application scans both its own package and org.arya.banking.common. This ensures that shared beans like the GlobalExceptionHandler, KafkaConfiguration, MongoConfig, and EventContextAop (AOP aspect for ThreadLocal cleanup) are correctly registered.

3. MongoDB Auditing

@EnableMongoAuditing activates Spring Data's auditing features, automatically populating @CreatedDate and @LastModifiedDate fields in entities like User and SecurityDetails.

4. AOP Proxy

@EnableAspectJAutoProxy enables Spring AOP proxy creation, allowing aspects like EventContextAop to intercept @KafkaListener methods and automatically clear EventContext ThreadLocal values after execution.

5. Feign & OAuth2

@EnableFeignClients is configured with OAuth2FeignConfig as the default, ensuring all inter-service communication (e.g., to the Auth Service) is automatically authenticated.

Startup Warm-up

The service includes a KafkaWarnUp component that forces a connection to the Kafka broker during startup:

@PostConstruct
public void init() {
    producerFactory.createProducer().close();
    log.info("Kafka connection established");
}