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Thomas Vitale GOTO Aarhus May 23rd, 2023 Next-Generation Cloud Native Apps with Spring Boot 3 @vitalethomas

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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

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Spring @vitalethomas

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thomasvitale.com @vitalethomas https://spring.io @vitalethomas

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Java 17 @vitalethomas

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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

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Deployment @vitalethomas

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Packaging Spring Boot JAR & Container Image JAR Container Image Gradle bootJar Maven spring-boot:repackage Gradle bootBuildImage Maven spring-boot:build-image @vitalethomas

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“Friends don’t let friends write Dockerfiles!” - Josh Long @vitalethomas

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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

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Image pack build Cloud Native Buildpacks From source code to container image @vitalethomas

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Native Images @vitalethomas

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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

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Spring Boot 3 and Native Executables The downsides of GraalVM Slower Heavier Build Additional con fi guration might be needed @vitalethomas

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Data Persistence @vitalethomas

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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

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Data Integration Spring Data for Relational Databases Spring Data JPA ‣JPA & Hibernate ‣Repositories ‣JDBC Spring Data Relational ‣DDD Principles ‣Repositories ‣JDBC/R2DBC @vitalethomas

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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

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Testing @vitalethomas

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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

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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

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Jakarta EE 10 @vitalethomas

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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;

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https://docs.openrewrite.org @vitalethomas

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Observability @vitalethomas

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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

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grafana.com @vitalethomas

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Declarative Clients @vitalethomas

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Problem Details @vitalethomas

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https://www.rfc-editor.org/rfc/rfc7807 @vitalethomas

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Resources @vitalethomas

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https://github.com/ThomasVitale/spring-boot-next-gen-apps

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https://github.com/ThomasVitale/awesome-spring

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Thomas Vitale GOTO Aarhus May 23rd, 2023 Next-Generation Cloud Native Apps with Spring Boot 3 @vitalethomas