Cloud Native Java with Spring Boot (CNCF Aarhus, April 2024)

Java is a modern and powerful technology stack, making it an excellent choice for developing cloud-native applications. Spring, built on top of Java, offers a broad ecosystem of frameworks and libraries, prioritizing developer experience, production readiness, and cloud integrations.

In this session, Thomas will delve into common patterns and best practices for building cloud-native applications with Java. You will learn how to optimize the developer experience using Spring Boot, leveraging features like live reload and seamless integration with Testcontainers and Docker Compose to streamline development and testing processes.

Next, you will discover how to integrate applications with large language models and vector stores, bringing Generative AI capabilities into Java through Spring AI and LangChain4j. Following this, Thomas will demonstrate how to prepare applications for production by compiling Java into native executables with GraalVM, resulting in instant startup times and reduced memory consumption.

Finally, you will see how to containerize Java applications using Buildpacks, fine-tune observability with Micrometer and OpenTelemetry, and configure serverless deployments on Kubernetes with Knative.

Transcript

1. Thomas Vitale Cloud Native Aarhus April 18th, 2024 Cloud Native Java With Spring Boot @vitalethomas
2. Systematic • Software Engineer • CNCF Ambassador, Oracle ACE Pro, Testcontainers Community Champion • Author of “Cloud Native Spring in Action” (Manning). • OSS contributor (Java, Spring, Cloud Native Technologies) Thomas Vitale thomasvitale.com @vitalethomas
3. @vitalethomas dev.java
4. From Traditional to Cloud Native Application Server, Embedded Server Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) @vitalethomas
5. spring.io
6. Moving to Containers Application Server, Embedded Server, Container Runtime (OCI) Application (Container) Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) @vitalethomas
7. Image pack build Cloud Native Buildpacks From source code to container image @vitalethomas Cloud Native Buildpacks https://buildpacks.io
8. Image pack build gradle bootBuildImage Cloud Native Buildpacks From source code to container image @vitalethomas Cloud Native Buildpacks https://buildpacks.io
9. Spring Boot and Native Executables The bene fi ts of GraalVM Instant Startup Low Resource Usage Instant Peak Performance @vitalethomas Reduced Surface Attack Compact Packaging
10. Spring Boot and Native Executables The downsides of GraalVM Slower Build Additional con fi guration might be needed @vitalethomas
11. Packaging Spring Boot JAR, Native, Container Image JAR OCI Image Gradle bootJar Maven package Gradle bootBuildImage Maven spring-boot:build-image @vitalethomas Native Gradle nativeCompile Maven -Pnative native:compile
12. Testcontainers Dev and Test Services OCI containers Run external dependencies as OCI containers, also at development time 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
13. Spring Observability Production-grade features Spring Boot Actuator ‣Health (liveness and readiness) ‣Management (loggers, con fi guration) ‣Flyway, Thread Dumps, Heap Dumps Micrometer ‣Uni fi ed Observation API ‣Instrumentation for metrics and traces ‣Prometheus, OpenTelemetry @vitalethomas
14. Moving to Kubernetes Application Server, Embedded Server, Container, Kubernetes Runtime (OCI) Middleware (Kubernetes) Application (Container) Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) Runtime (OCI) Application (Container) @vitalethomas
15. Continuous Development Code, Run, Test, Debug Development Workflow gradle bootRun flask --debug run yarn dev Dev & Test Services @vitalethomas
16. Configuration: Workload API Crossplane Composition @vitalethomas
17. Project Bootstrapping Backstage Software Templates @vitalethomas
18. Configuration: Implementation Crossplane Composition Workload API Serverless Deployment Service Binding Application Conventions @vitalethomas
19. Kubernetes Native Spring Boot Workload con fi guration and management Liveness Probe Con fi gMaps @vitalethomas Readiness Probe Secrets Service Bindings Runtime Reload
20. Generative AI @vitalethomas
21. Resources @vitalethomas
22. Resources Cloud Native Java with Spring Boot • Presentation source code • Spring AI • Spring CLI • LangChain4j Spring Boot • Serverless Java with Spring Boot • Securing the Supply Chain for Your Java Applications • Building AI-Ready Platforms - Symphony for Developer and Platform Engineer @vitalethomas
23. Thomas Vitale Cloud Native Aarhus April 18th, 2024 Cloud Native Java With Spring Boot @vitalethomas