Spring Boot Best Practices for Building Microservices

Spring Boot is the most popular Java framework for developing microservices. Since 2016 the author has gathered practical best‑practice recommendations based on personal experience and insights from Spring Boot experts.

1. Use a custom BOM to manage third‑party dependencies

Maintain a platform‑bom that imports all shared dependencies, allowing a single version upgrade for the whole ecosystem.

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>io.spring.platform</groupId>
      <artifactId>platform-bom</artifactId>
      <version>Cairo-SR3</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

2. Leverage automatic configuration

Spring Boot starters simplify integration. For Redis:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

For MongoDB:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

Exclude unwanted auto‑configurations only when absolutely necessary, e.g. using

@EnableAutoConfiguration(exclude = {ClassNotToAutoconfigure.class})

.

3. Start new projects with Spring Initializr

Use https://start.spring.io/ to generate a tested, dependency‑managed project skeleton.

4. Create custom auto‑configuration for common organizational concerns

When many teams share the same problems, package reusable auto‑configuration in a library to reduce duplication.

5. Design a clear code package structure

Avoid the default package, keep the entry class at the top level, and group controllers and services by feature.

6. Keep @Controller classes simple and focused

Controllers should be stateless, delegate business logic to services, handle only HTTP concerns, and be designed around use‑cases.

7. Build @Service beans around business capabilities

Name services by domain (e.g., AccountService, UserService) rather than technical concerns.

8. Isolate database access from core business logic

Follow clean‑architecture principles so services do not depend on specific database implementations.

9. Protect business logic from Spring Boot intrusions

Keep Spring annotations out of pure domain code to maintain reusability and testability.

10. Prefer constructor injection

Constructor injection makes beans easier to instantiate without Spring and avoids the optional @Autowired on fields.

11. Understand the concurrency model

Controllers and services are singletons; be aware of thread‑safety and configure thread pools appropriately.

12. Externalize configuration management

Use Spring Cloud Config or environment variables to centralize settings across multiple services.

13. Provide global exception handling

Implement HandlerExceptionResolver or use @ExceptionHandler on controllers for consistent error responses.

14. Use a proper logging framework

Obtain a logger via:

Logger logger = LoggerFactory.getLogger(MyClass.class);

15. Test your code

Write unit and integration tests; consider Spring Cloud Contract for consumer‑driven contracts.

16. Use test slices for focused testing

Leverage Spring Boot test slices to load only the necessary parts of the application context, speeding up test execution.

By following these practices, developers can create Spring Boot microservices that are easier to maintain, scale, and evolve.