Serverless Java with Spring Boot (DevBcn 2023)

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Thomas Vitale DevBcn July 4th, 2023 Serverless Java with Spring Boot @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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Serverless @vitalethomas

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1. No Servers @vitalethomas

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1. No Servers Infrastructure @vitalethomas

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Serverless Architectures Developers focus on code Focus on business logic Developer Platform Infrastructure Provisioning Workload Management Dynamic Scaling @vitalethomas

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JAR Serverless Platforms From application artifact to URI @vitalethomas packaged as OCI Image deployed on deployed on

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Serverless Platforms From application artifact to URI @vitalethomas aws lambda create-function --function-name Uppercase --zip-file java-function.jar kn service create uppercase --image ghcr.io/thomasvitale/java-function

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thomasvitale.com @vitalethomas https://tag-app-delivery.cncf.io/whitepapers/platforms @vitalethomas

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2. Scale to Zero @vitalethomas

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2. Scale to from Zero @vitalethomas

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GraalVM @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 Longer Build Time Additional con fi guration might be needed @vitalethomas

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CRaC @vitalethomas

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3. Functions @vitalethomas

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Functional Programming Paradigm Java Functional Interfaces Supplier Function Consumer @vitalethomas

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Function Composition Data processing via functions uppercase() sentence() “I play the PIANO” “piano” “PIANO” @vitalethomas

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Spring Cloud Function @vitalethomas

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@vitalethomas Spring Cloud Function Java Function Spring Cloud Function

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Spring Cloud Function Business logic as functions Transparent Type Conversion Function Arity Function Composition Reactive Support JAR Functions @vitalethomas

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4. Triggers @vitalethomas

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@vitalethomas Spring Cloud Function Java Function Spring Cloud Function

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@vitalethomas AWS Lambda Spring Cloud Function Java Function AWS Lambda org.springframework.cloud spring-cloud-function-adapter-aws

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@vitalethomas Azure Function Spring Cloud Function Java Function Azure Functions org.springframework.cloud spring-cloud-function-adapter-azure

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@vitalethomas Google Cloud Function Spring Cloud Function Java Function Google Cloud Functions org.springframework.cloud spring-cloud-function-adapter-aws

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@vitalethomas Spring Web Spring Cloud Function Java Function Web Applications

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5. Event-driven @vitalethomas

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@vitalethomas Spring Cloud Stream Spring Cloud Function Java Function Event-driven Applications

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Spring Cloud Stream @vitalethomas

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Spring Cloud Stream Event-driven applications Integration with event brokers Bindings with functions Publish Subscribe Consumer Groups Partitions @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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6. Developer Experience @vitalethomas

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Developer Experience “…developer experience could be defined as a means for capturing how developers think and feel about their activities within their working environments, with the assumption that an improvement of the developer experience has positive impacts on characteristics such as sustained team and project performance.” (F. Fagerholm, J. Münch) Developer Experience: Concept and De fi nition (F. Fagerholm, J. Münch) @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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Image pack build gradle bootBuildImage Cloud Native Buildpacks From source code to container image @vitalethomas

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Deploying Functions with Knative From idea to deployment with autoscaling URL func create Image func deploy Kubernetes Cluster Container Container Container Knative Serving @vitalethomas

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Deploying Functions with Knative From idea to deployment with autoscaling URL func create Image func deploy Kubernetes Cluster Container Container Container Knative Serving @vitalethomas

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Resources @vitalethomas

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github.com/ThomasVitale/serverless-java-with-spring-boot

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

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Thomas Vitale DevBcn July 4th, 2023 Serverless Java with Spring Boot @vitalethomas