🏦 Travel Bank – Config Management with Spring Boot(v3)

This repository is dedicated to configuration management for the Travel Bank microservices application. It is designed to support scalable, cloud-native architecture using Spring Boot configuration best practices.

---

📌 Project Continuity

This repository continues from:

• TRAVEL-BANK_Microservices_v.1.0
• TRAVEL-BANK_Docker_v.2.0

The current version, v3.0, focuses on centralized configuration management, making the services more maintainable and scalable.

---

🧰 Configuration Management in Spring Boot

Spring Boot supports multiple ways to read application properties. Here’s a breakdown of the most commonly used approaches:

1️⃣ Using @Value

Inject individual property values directly into Spring Beans.

@Value("${property.name}")
private String propertyValue;

2️⃣ Using Environment

Use the Environment interface to programmatically fetch property values.

@Autowired
private Environment environment;

public void getProperty() {
    String propertyValue = environment.getProperty("property.name");
}

3️⃣ Using @ConfigurationProperties ✅ Recommended

Bind groups of related properties to a POJO class.

@ConfigurationProperties(prefix = "prefix")
public class MyConfig {
    private String property;
    // getters and setters
}

This avoids hardcoding keys and improves maintainability.

---

🌐 Profiles in Spring Boot

Spring provides a powerful tool called profiles to manage configuration for multiple environments like dev, qa, and prod. Profiles allow selective loading of properties and bean creation based on the environment.

✅ Creating Profile-Specific Files

• application.properties → Default profile
• application_qa.properties → QA environment
• application_prod.properties → Production environment

✅ Activating a Profile

spring.profiles.active=prod

✅ Externalizing Configuration

Spring Boot supports various methods to externalize configuration after the JAR is built:

1. Command-Line Arguments

java -jar accounts-service.jar --build.version="1.1"

2. JVM System Properties

java -Dbuild.version="1.2" -jar accounts-service.jar

3. Environment Variables

Windows:

env:BUILD_VERSION="1.3"; java -jar accounts-service.jar

Linux/macOS:

BUILD_VERSION="1.3" java -jar accounts-service.jar

Spring handles relaxed binding (e.g., BUILD_VERSION becomes build.version).

❗ Drawbacks of Spring Boot Only Externalized Config

1. Risk of manual errors due to CLI/JVM arguments
2. Difficult to track/audit config changes
3. Lack of granular access control with environment variables
4. Challenges in managing config in distributed setups
5. No built-in encryption for secrets
6. Config reload without restart requires additional tools (e.g., Spring Cloud Config)

---

🐳 Docker Support (From v2.0)

Each microservice in the Travel Bank ecosystem is fully containerized using Docker.

🔧 Docker Compose

docker compose up -d
docker compose down

🔧 Build Docker Images

Method	Command
Google Jib	mvn compile jib:dockerBuild
Buildpacks	mvn spring-boot:build-image
Dockerfile	docker build . -t :

▶️ Run Docker Containers

docker run -p 8080:8080 vinaysteja0231/accounts:v2.0
docker run -d -p 8080:8080 vinaysteja0231/accounts:v2.0

---

🧩 Travel Bank - Microservices Overview

A microservices-based banking platform built with Spring Boot.

✅ Core Services

Service	Features
Accounts	Customer registration, account creation, validations, exception handling
Cards	Card issuance, CRUD for cards
Loans	Loan application, tracking, CRUD operations

---

🛠️ Tech Stack

• Java 17+
• Spring Boot 3.x
• Spring Data JPA
• H2 Database
• Swagger (OpenAPI)
• Docker + Buildpacks + Jib
• Maven
• Postman

---

🔍 API Testing & Docs

• 📘 Swagger UI: http://localhost:8080/swagger-ui/index.html
• 💾 H2 Console: http://localhost:8080/h2-console

---

🧪 Postman Collection

A ready-to-use Postman collection is available here:

📂 File: TRAVEL-BANK.postman_collection.json
🔹 Test all microservices from one place

---

📈 Future Enhancements

• 📡 Integrate Kafka for event-driven architecture
• 🧭 API Gateway + Eureka Discovery
• 📊 Logging & Monitoring with ELK Stack
• 🐳 Docker Compose for full service orchestration

---

📚 Related Repositories

• travelbank-microservices
• travelbank-docker

---

🙌 Contribution

Feel free to fork, raise issues, or submit pull requests. Feedback and improvements are always welcome!

---

📜 License

This project is licensed under the MIT License.