Top 22 Spring Boot Best Practices to Boost Performance and Maintainability

Spring Boot is a widely used, high‑performance enterprise framework. This article compiles best practices and tips to improve Spring Boot applications.

1. Correct Package Structure

Use meaningful packages: separate controllers, services, utils, and for large codebases adopt feature‑based modules.

2. Use Design Patterns

Design patterns are essential for writing maintainable and extensible code.

3. Use Spring Boot Starters

Starters bundle required dependencies, simplifying dependency management.

Adding spring-boot-starter-web automatically includes Jackson, Spring Core, Spring MVC, and Tomcat.

4. Use Production‑Ready Dependency Versions

Prefer the latest stable GA versions and specify versions centrally using <properties>.

5. Use Lombok

Lombok reduces boilerplate; annotations like @Data, @Getter, @Setter, and @Slf4j generate code automatically.

6. Constructor Injection with Lombok

Prefer constructor injection for required dependencies; Lombok’s @RequiredArgsConstructor simplifies it.

7. Use SLF4J Logging

Avoid System.out.print(); use SLF4J with placeholders and @Slf4j for clean logging.

8. Controllers Only for Routing

Controllers are stateless and handle routing.

Business logic belongs in the service layer. DispatcherServlet checks @RequestMapping on controllers.

9. Services Implement Business Logic

Include validation, caching, and persistence communication.

Services are singleton beans.

10. Avoid NullPointerException

Use java.util.Optional for nullable values.

Leverage utilities like Apache Commons StringUtils.

Prefer equals(), equalsIgnoreCase(), and valueOf() over toString().

Annotate with @NotNull and @Nullable.

11. Collection Framework Best Practices

Choose appropriate collections for data sets.

Use forEach with Java 8 streams instead of old loops.

Program to interfaces, not implementations.

Prefer isEmpty() over size() for readability.

Return empty collections instead of null.

Override equals() and hashCode() for objects stored in hash‑based collections.

12. Use Pagination

Pagination improves performance; with Spring Data JPA, PagingAndSortingRepository makes it effortless.

13. Use Caching

Spring Boot provides a default ConcurrentHashMap cache; enable with @EnableCaching. For advanced needs, integrate Redis, Hazelcast, or database caches.

14. Custom Exception Handling

Use @ControllerAdvice to create centralized, meaningful exception handlers for large enterprise applications.

15. Custom Response Objects

Design response DTOs with builder pattern to include data, status codes, and messages.

16. Remove Unnecessary Code

Delete unused variables, methods, and classes.

Avoid nested loops; prefer map operations.

17. Use Comments Wisely

Write descriptive comments for classes, methods, and variables; avoid redundant or misleading comments.

18. Meaningful Naming

Use clear, searchable names for classes, methods, and variables (e.g., firstName, readFile(), sendData()).

19. Proper Case Conventions

Classes – PascalCase

Methods/Variables – camelCase

Constants – SCREAMING_SNAKE_CASE

Database fields – kebab-case

20. Keep It Simple

Apply KISS, DRY, and SOLID principles to write simple, readable code.

21. Consistent Code Formatting

Adopt a common coding style across the team to reduce merge conflicts.

22. Use SonarLint Plugin

Integrate SonarLint in your IDE to catch small errors and enforce best practices.

Project example: Spring Boot + MyBatis Plus + Vue 3.2 + Vite + Element Plus front‑back separation blog. GitHub: https://github.com/weiwosuoai/WeBlog Gitee: https://gitee.com/AllenJiang/WeBlog

Source: translated from a Medium article (original URL: https://medium.com/@raviyasas/spring-boot-best-practices-for-developers-3f3bdffa0090).