Spring Boot Best Practices: 16 Tips for Building Robust Microservices

Spring Boot is the most popular Java framework for developing microservices. Since 2016 the author has collected a set of best‑practice guidelines based on personal experience and insights from Spring Boot experts. The following practices apply to Spring Boot projects and are generally useful for Spring applications.

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

Large projects often include many third‑party libraries that are not covered by Spring Boot’s default dependency management. Creating a custom platform‑BOM (similar to Spring IO Platform) allows all modules to import a single BOM, simplifying version upgrades.

<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 auto‑configuration

Spring Boot’s auto‑configuration activates when specific starter JARs are present on the classpath, reducing boilerplate. Include starters such as spring-boot-starter-data-redis or spring-boot-starter-data-mongodb to integrate Redis or MongoDB with minimal effort.

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

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

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

@EnableAutoConfiguration(exclude = {ClassNotToAutoconfigure.class})

.

3. Start projects with Spring Initializr

Spring Initializr ( https://start.spring.io/ ) generates a ready‑to‑run project with selected dependencies, ensuring you begin with tested, compatible versions.

4. Create your own auto‑configuration for common concerns

In large teams that heavily rely on Spring Boot, encapsulating recurring configuration into a custom starter can reduce duplication and simplify onboarding for new services.

5. Design a clear source‑code package structure

Avoid the default (unnamed) package; place the Application.java entry point at the top level, group controllers and services by feature, and stay consistent throughout the codebase.

6. Keep @Controller simple and focused

Controllers should be stateless, delegate business logic to services, and handle only HTTP concerns. Follow the GRASP Controller pattern for clean separation.

7. Build @Service around business capabilities

Name services after the domain concept they implement (e.g., AccountService, UserService, PaymentService) rather than technical concerns like DatabaseService.

8. Isolate database logic from core business

Follow the “Clean Architecture” principle: keep persistence details in separate modules so the core domain does not depend on a specific database technology.

9. Protect business logic from Spring Boot intrusions

Avoid sprinkling Spring annotations throughout the domain layer; keep the core reusable outside of the framework.

10. Prefer constructor injection

Constructor injection (optionally annotated with @Autowired) makes beans easier to test and eliminates the need for reflection‑based field injection.

11. Understand the concurrency model

Spring Boot controllers and services are singletons by default, so be aware of thread‑safety and configure appropriate thread pools. For reactive applications, study WebFlux/Reactor parallelism.

12. Externalize configuration management

Use Spring Cloud Config or environment variables (potentially backed by a Git repo) to centralize configuration across multiple services.

13. Provide global exception handling

Implement a HandlerExceptionResolver or use @ExceptionHandler on controllers for consistent error responses; see Baeldung’s guide for details.

14. Use a logging framework

Prefer a logger (e.g., SLF4J) over System.out.println for configurable log levels.

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

15. Test your code

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

16. Use test slices to focus tests

Spring Boot test slices (e.g., @WebMvcTest, @DataJpaTest) load only the parts of the application needed for a specific test, speeding up execution.

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