Next-Generation Cloud Native Apps with Spring Boot 3

The recent release of Spring Boot 3 laid the foundation for the next generation of modern Java applications. This session will highlight what’s new, and demonstrate hands-on patterns and techniques for cloud native development.

Support for generating native executables with GraalVM is now part of the core framework, making it straightforward to build efficient applications with instant startup time and reduced memory consumption. The new Java 17 baseline and support for Jakarta EE 10 unlock many new features and integrations.

Observability is now a core tenet of the Spring ecosystem, with monitoring and tracing built into each Spring module and powered by Micrometer and OpenTelemetry. Finally, developer experience gets a significant boost with the new development services based on Docker Compose and Testcontainers.

Transcript

1. Thomas Vitale GOTO Aarhus May 23rd, 2023 Next-Generation Cloud Native Apps with Spring Boot 3 @vitalethomas
2. Systematic • Software Engineer and Cloud Architect. • Author of “Cloud Native Spring in Action” (Manning). • OSS contributor (Java, Spring, Cloud Native Technologies) Thomas Vitale thomasvitale.com @vitalethomas
3. Spring @vitalethomas
4. thomasvitale.com @vitalethomas https://spring.io @vitalethomas
5. Java 17 @vitalethomas
6. Java 8 -> 11 -> 17 Performance improvements @vitalethomas Java 8 ‣Startup: 3.784 s ‣Max heap used: 113 MiB ‣Committed heap: 177 MiB Java 11 ‣Startup: 2.204 s ‣Max heap used: 43 MiB ‣Committed heap: 74 MiB Java 17 ‣Startup: 1.776 s ‣Max heap used: 37 MiB ‣Committed heap: 55 MiB
7. Deployment @vitalethomas
8. Packaging Spring Boot JAR & Container Image JAR Container Image Gradle bootJar Maven spring-boot:repackage Gradle bootBuildImage Maven spring-boot:build-image @vitalethomas
9. “Friends don’t let friends write Dockerfiles!” - Josh Long @vitalethomas
10. Dockerfiles “Dockerfiles are easy to write, but the current development guidelines do not produce containers that are repeatable and hardened.” CNCF Software Supply Chain Security Paper https://github.com/cncf/tag-security/tree/main/supply-chain-security @vitalethomas
11. Image pack build Cloud Native Buildpacks From source code to container image @vitalethomas
12. Native Images @vitalethomas
13. Spring Boot 3 and Native Executables The bene fi ts of GraalVM Instant Startup Low Resource Usage Instant Peak Performance @vitalethomas Reduced Surface Attack Compact Packaging
14. Spring Boot 3 and Native Executables The downsides of GraalVM Slower Heavier Build Additional con fi guration might be needed @vitalethomas
15. Data Persistence @vitalethomas
16. Data Integration Spring Data for Relational Databases Spring Data JPA ‣JPA & Hibernate ‣Repositories ‣JDBC Spring Data JDBC ‣DDD Principles ‣Repositories ‣JDBC Spring Data R2DBC ‣DDD Principles ‣Repositories ‣R2DBC @vitalethomas
17. Data Integration Spring Data for Relational Databases Spring Data JPA ‣JPA & Hibernate ‣Repositories ‣JDBC Spring Data Relational ‣DDD Principles ‣Repositories ‣JDBC/R2DBC @vitalethomas
18. Schema and data management Flyway: Version control for your database SQL Migrations Schema changes Java Migrations Data changes V1 Init schema V2 Add column V3 Create table V4 Add constraint time @vitalethomas
19. Testing @vitalethomas
20. Testing Spring Boot Types of auto tests for Spring Boot applications Unit Tests ‣JUnit ‣Mockito ‣No Spring context Integration Tests ‣@SpringBootTest ‣Web server ‣Full Spring context Slice Tests ‣@SpringWebMvc ‣@SpringDataR2dbc ‣Sliced Spring context @vitalethomas
21. Testcontainers Development and testing with external dependencies OCI containers Run external dependencies as OCI containers Data Layer Tests Ensure environment parity by testing the data layer with the real database Integration Tests Use containers for databases, message queues, and web servers @vitalethomas
22. Jakarta EE 10 @vitalethomas
23. From Java EE to Jakarta EE New package names since Jakarta EE 9 import javax.persistence.Entity; import javax.servlet.Servlet; import javax.validation.Valid; @vitalethomas import jakarta.persistence.Entity; import jakarta.servlet.Servlet; import jakarta.validation.Valid;
24. https://docs.openrewrite.org @vitalethomas
25. Observability @vitalethomas
26. Spring Observability Production-grade features Spring Boot Actuator ‣Health (liveness and readiness) ‣Metrics (Prometheus, OpenMetrics) ‣Flyway, Thread Dumps, Heap Dumps Micrometer ‣Uni fi ed Observation API ‣Instrumentation for metrics and traces ‣OpenZipkin, OpenTelemetry @vitalethomas
27. grafana.com @vitalethomas
28. Declarative Clients @vitalethomas
29. Problem Details @vitalethomas
30. https://www.rfc-editor.org/rfc/rfc7807 @vitalethomas
31. Resources @vitalethomas
32. https://github.com/ThomasVitale/spring-boot-next-gen-apps
33. https://github.com/ThomasVitale/awesome-spring
34. Thomas Vitale GOTO Aarhus May 23rd, 2023 Next-Generation Cloud Native Apps with Spring Boot 3 @vitalethomas