Spring Boot Unwrapped - Exploring the Latest Features / VDT25

Transcript

1. Spring Boot Unwrapped: Exploring the Latest Features Sergi Almar @sergialmar
2. 2 Using Spring Boot 2.7? Using Spring Boot 3.4? Quick Show of Hands Or below…
3. Hello! I am Sergi Almar Passionate about Spring. Independent Software Engineer & Spring Trainer Organizer Spring I/O conference. 3
4. Spring Boot is moving fast • New major or minor version every six months • +1100 contributors, incredibly active community • Continuous innovation . 4
5. Spring Boot Versions Spring Boot 3.2 Spring Boot 3.3 Spring Boot 3.4 Release Date Nov 23, 2023 May 23, 2024 Nov 21, 2024 Spring Framework 6.1.1 6.1.8 6.2.0 5
6. 6 Main Features Lorem ipsum congue tempus Spring Boot 3.0 GraalVM Spring AOT Observation API Spring Boot 3.2 Virtual Threads Project CRaC Spring Boot 3.4 Structured Logging Spring Boot 3.1 Testcontainers Docker Compose Spring Boot 3.3 CDS
8. Spring Release Calendar 8
9. Observability Logs, Metrics and Tracing
10. Text-based logging 10
11. Structured logging 11
12. Metrics with Micrometer 12 • Metrics exposed by Spring Boot Actuator • Spring projects are instrumented with Micrometer
13. Tracing with Micrometer 13 • Micrometer Tracing (no more Spring Cloud Sleuth) • Abstraction layer on top of tracing libraries: ◦ Brave ◦ OpenTelemetry
14. Virtual Threads Project Loom Support
15. Virtual Threads 15 • Part of Project Loom in JDK 21 • Single property to opt-in ◦ No code changes required
16. Virtual Threads Autoconfig 16 • Embedded Servlet container autoconfiguration
17. Virtual Threads Autoconfig 17
18. Client Support JdbcClient and RestClient
19. RestClient 19 • Synchronous HTTP client ◦ Uses the RestTemplate infrastructure • Client autoconfiguration ◦ Apache HTTP Components ◦ Jetty Client ◦ Reactor Netty ◦ JDK ◦ Simple JDK
20. JdbcClient 20 • Unified facade for query/update statements on top of JdbcTemplate
21. Client in Spring AI 21 • Portable interface for interacting with various AI Models
22. Spring Boot Actuator New Endpoints
23. New Info Contributors 23
24. New Info Contributors 24
25. Actuator Endpoints Access 25
26. SBOM Endpoint 26 • Exposes the Software Bill of Materials. • CycloneDX SBOMs auto-detected. Maven and Gradle plugins ◦ Generates CycloneDX Software Bill of Materials (SBOM) with of all direct and transitive dependencies of a project.
27. 27 SBOM Endpoint
28. Scheduled Tasks Endpoint 28 • Exposes additional metadata about scheduled tasks
29. Packaging Improvements in OCI containers
30. Smaller containers • Now uses paketobuildpacks/builder-jammy-java-tiny builder ◦ Doesn’t include a shell 30
31. ARM containers • Out-of-the-box support for ARM architecture ◦ imagePlatform parameter (linux/amd64, linux/arm64) ◦ Works for native image also 31
32. CDS Class Data Sharing
33. Spring Boot CDS • Start your application faster and consume less memory ◦ Less improvements compared to native images ◦ But still staying on the JVM 33 Training Run CDS Archive Production Run
34. Exploded JAR • Running CDS on an executable JAR is not recommended ◦ loading classes from nested jars has a startup cost ◦ running the app from an exploded JAR is faster and recommended in prod 34 vdt25application.jar libs
35. CDS Archive • Spring Boot offers a convenient way to build a CDS archive • Specify these two options when starting you app ◦ -XX:ArchiveClassesAtExit=application.jsa ◦ -Dspring.context.exit=onRefresh 35 Training Run CDS Archive
36. Running with CDS • Specify the CDS archive when running the application • Some constraints ◦ Must use the same JVM utilized for creating the archive ◦ Same classpath 36 CDS Archive Production Run
37. 37 https:/ /spring.io/blog/2024/08/29/spring-boot-cds-support-and-project-leyden-anticipation
38. 38 CDS and Buildpacks • Performs automatically the training run. • Extract the Spring Boot executable JAR to the CDS friendly file layout • Adds the CDS archive in the container. • Automatically enables CDS when running the container image.
39. 39 CDS and Buildpacks
40. Testing Bean Overriding support and MockMvcTester
41. Bean Overriding • Spring Boot disables bean definition overriding by default. • TestContext framework introduces new bean overriding support ◦ Based on @BeanOverride meta-annotation and associated infrastructure ◦ @TestBean, @MockitoBean and @MockitoSpyBean 41
42. @TestBean • @TestBean allows overriding a specific bean in the test’s ApplicationContext ◦ Providing a static factory method 42
43. @TestBean 43
44. @MockitoBean 44 • @MockBean is deprecated in favor of @MockitoBean
45. @MockitoSpyBean 45 • Wraps the original instance in a Mockito spy.
46. @BeanOverride 46
47. MockMvcTester • The regular MockMvc uses Hamcrest. • The new MockMvcTester uses AssertJ. ◦ Wraps MockMvc • @AutoConfigureMockMvc and @WebMvcTest autoconfigures: ◦ MockMvc ◦ MockMvcTester (if AssertJ is on the classpath) 47
48. MockMvcTester 48
49. But there’s more! Minor improvements
50. Other Features • Graceful shutdown by default. • Fragment Rendering • Background bean initialization • Fallback beans • Content negotiation for @ExceptionHandler methods • Testcontainers improvements • … 50
51. Upgrading Getting the latest bits
52. Upgrading • Better performance and startup times • New features • Security Updates • Review the release notes and migration guides • Refactor or remove deprecated APIs / properties • Test! 52
53. 53 OpenRewrite
54. Spring Boot Roadmap Spring Boot 3.5 Spring Boot 4.0 Scheduled Date May 2025 Nov 2025 Spring Framework 6.2.x 7.0 54 https:/ /spring.io/blog/2024/10/01/from-spring-framework-6-2-to-7-0
55. “ Thank you ❤ Spring team! Java 21, virtual threads, CDS, Observability, Buildpacks, Autoconfiguration, simple abstractions… 55
56. 56 Thanks! Any questions? You can find me on X (@sergialmar) or Bsky (@sergialmar.com)