🚀 QUARKUS WAY
@ApplicationScoped
public class LoggerService {
@Inject
@ConfigProperty(name = "logging.verbose", defaultValue = "false")
boolean verbose;
public void log(String message) {
if (verbose) System.out.println("[VERBOSE] " + message);
}
}
🌱 SPRING WAY
@Service
public class LoggerService {
@Value("${logging.verbose:false}")
private boolean verbose;
public void log(String message) {
if (verbose) System.out.println("[VERBOSE] " + message);
}
}
🔍 KEY DIFFERENCES
🔸 Bean discovery
- Quarkus: CDI annotations (@ApplicationScoped, @Inject).
- Spring: Stereotypes (@Service, @Component) + @Autowired (constructor injection recommended).
🔸 Scope
- Quarkus: @ApplicationScoped = app-wide singleton.
- Spring: default scope is singleton via @Service.
🔸 Config
- Quarkus: MicroProfile Config (@ConfigProperty).
- Spring: @Value or @ConfigurationProperties.
🔸 Startup & footprint
- Quarkus favors fast startup & low RSS (great for containers/GraalVM).
- Spring offers rich ecosystem & autoconfiguration.
🔸 Testing & mocks
- Quarkus: @QuarkusTest, @InjectMock.
- Spring: @SpringBootTest, @MockBean.
🔁 MIGRATION TIPS (SPRING ➜ QUARKUS)
- Replace @Service/@Component ➜ @ApplicationScoped (or appropriate CDI scope).
- Swap @Autowired/@Value ➜ @Inject and @ConfigProperty.
- Move Boot starters ➜ Quarkus extensions (quarkus-smallrye-config, quarkus-rest, etc.).
- Replace Spring annotations/APIs with CDI/JAX-RS counterparts (e.g., @RestController ➜ @Path + @GET).
- Tests: @SpringBootTest ➜ @QuarkusTest, @MockBean ➜ @InjectMock.
- Use the Quarkus Dev Mode (mvn quarkus:dev) to iterate quickly and catch config/DI issues early.
✅ TAKEAWAYS
- Same concept, different idioms: CDI (Quarkus) vs Spring stereotypes.
- Config is first-class in both; choose MicroProfile Config or Spring Config accordingly.
- Quarkus shines for container/GraalVM use cases; Spring shines with its ecosystem & autoconfig.
- Migration is mostly annotation & API mapping—start with DI, config, and web layers.
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