Top 16 Spring Boot Best Practices Every Backend Engineer Should Know

Use a custom BOM to manage third‑party dependencies

Create a platform‑BOM (similar to Spring IO Platform) that imports a single BOM in all modules. This centralizes version management and simplifies 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>

Leverage Spring Boot auto‑configuration

Auto‑configuration activates when specific JARs are on the classpath, reducing boilerplate. Use Spring Boot Starters for common technologies such as Redis or MongoDB.

<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‑configuration classes only when necessary:

@EnableAutoConfiguration(exclude = {ClassNotToAutoconfigure.class})

https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-auto-configuration.html

Start new projects with Spring Initializr

Generate a ready‑to‑run Spring Boot project with selected dependencies, ensuring they are compatible with Spring Boot’s auto‑configuration.

https://start.spring.io/

Create custom auto‑configuration for common organizational needs

Package recurring configuration into a custom starter or auto‑configuration library to reduce duplication across many services. Publish it as a reusable Spring Boot library when appropriate.

Design a sensible code directory structure

Avoid the default (unnamed) package; place all classes in a well‑named base package.

Keep the main class (e.g., Application.java) at the top‑level source directory.

Group controllers and services by functional modules or keep them together—choose a consistent style.

Keep @Controller classes simple and focused

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

https://en.wikipedia.org/wiki/GRASP_(object-oriented_design)#Controller

Stateless singletons by default.

No business logic; delegate to services.

Handle only the web layer.

Design around use‑case capabilities.

Build @Service beans around business capabilities

Name services after domain concepts (e.g., AccountService, UserService) rather than technical concerns. A one‑to‑one mapping between controller and service is ideal but not mandatory.

Isolate the database from core business logic

Apply Clean Architecture principles: treat the database as a detail and depend on abstractions (e.g., repository interfaces) so services are independent of the concrete persistence implementation.

Protect business logic from Spring‑specific code

Avoid mixing framework annotations inside core domain classes. Keep domain objects free of Spring dependencies to retain reusability and testability.

Prefer constructor injection

Constructor injection (the @Autowired annotation is optional on constructors) makes beans easy to instantiate in unit tests without a Spring context.

Understand the concurrency model

Controllers and services are singletons, which can introduce concurrency issues. Be aware of thread‑pool limits and, for reactive applications, study WebFlux/Reactor parallelism and back‑pressure.

https://www.e4developer.com/2018/03/30/introduction-to-concurrency-in-spring-boot/

Externalize configuration management

Centralize configuration using a config server (e.g., Spring Cloud Config) or store values in environment variables, optionally backed by a Git repository.

Provide global exception handling

Implement a consistent error‑handling strategy using HandlerExceptionResolver or @ExceptionHandler on controllers.

https://www.baeldung.com/exception-handling-for-rest-with-spring

Use a logging framework

Prefer SLF4J with Logback over System.out.println. Example:

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

Test your code

Write unit and integration tests to prevent legacy code accumulation. For contract‑driven testing between services, consider Spring Cloud Contract.

Use test slices for focused testing

Test slices load only the parts of the application needed for a test, reducing startup time and isolating the test scope.

https://spring.io/blog/2016/08/30/custom-test-slice-with-spring-boot-1-4