Developer Experience in a Modern Java Framework

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Developer experience in a modern Java framework Álvaro Sánchez-Mariscal Principal Member of Technical Staff Oracle @alvaro_sanchez

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Copyright © 2024, Oracle and/or its affiliates 2 About me • Coming from Madrid • Developer since 2001 (Java stack) • Micronaut core developer since its inception (2017). • Author: Maven Plugin, Object Storage, Kubernetes, Cache, Control Panel. • Others: Core, Gradle, AWS, GCP, Azure, Security, Test, etc. • Currently at Oracle Labs: • Micronaut and Graal Development Kit for Micronaut (GDK). • GraalVM Native Build Tools. @alvaro_sanchez

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Copyright © 2024, Oracle and/or its affiliates. Micronaut® is a registered trademark of Object Computing, Inc. Use is for referential purposes and does not imply any endorsement or affiliation with any third-party product. 4

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Introduction to Micronaut Copyright © 2024, Oracle and/or its affiliates 5 Micronaut is a complete solution for any type of application: microservices, message-driven producers or consumers, command-line apps, serverless functions, etc. All application types Micronaut leverages Java annotation processors and other optimisations to compute the framework infrastructure at compile-time, drastically reducing startup time and memory consumption. Highly optimised Modern, open-source Java Framework Micronaut has been designed from scratch in 2017, focused on modern architectures like microservices and serverless, and with the cloud in mind.

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Micronaut computes at build time: • All dependency and configuration injection. • Annotation metadata (meta annotations) • AOP proxies. • Bean introspections. • All other framework infrastructure. At runtime: • No reflection. • No proxy generation. • No dynamic classloading. • No classpath scanning. AOT: Ahead Of Time Copyright © 2024, Oracle and/or its affiliates 6 Source code @Singleton class MySvc {} Bytecode class $MySvc$Definition {} class $MySvc$Definition$Reference {} Source code @Builder record Person() {} Source code @Generated class PersonBuilder() {} compilation compilation

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Micronaut features: message-driven applications Kafka • Producers. • Consumers. • Kafka Streams. RabbitMQ • Producers. • Consumers. • RPC. MQTT • Publishers. • Subscribers. NATS • Producers. • Consumers. Copyright © 2024, Oracle and/or its affiliates 10

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Micronaut features: data access 12 Copyright © 2024, Oracle and/or its affiliates Interface implemented at compile time Query generated from the method name, compile-time validated Can have custom queries, inserts, etc

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Micronaut unique features: Test Resources 1. Automatic provisioning of external resources needed during development or testing. • Containers, binaries, etc. 2. Built-in support: 3. Integrated with JUnit Platform (JUnit / Spock / Kotest) for zero-configuration Testcontainers. 13 Copyright © 2024, Oracle and/or its affiliates • MariaDB • MySQL • Oracle • PostgreSQL • SQL Server • Elasticsearch • Redis • MongoDB • Neo4j • Hashicorp Vault • Kafka • RabbitMQ • MQTT • Localstack

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Micronaut unique features: Serialization 1. Drop-in replacement for Jackson Databind, compile-time and reflection free. 2. Supports (most of) Jackson, JSON-B and BSON annotations. 3. Why? • Memory performance: 10x smaller runtime footprint. • Security: serializable classes must be opt-in. • Type-safety: Micronaut Serialization performs checks at compile-time (vs Jackson runtime exceptions). • Runtime portability: Micronaut Serialization at runtime supports different annotation sets. 14 Copyright © 2024, Oracle and/or its affiliates

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Micronaut unique features: Validation 1. Built-in alternative for Jakarta Bean Validation. • Spec features that require reflection are not supported. • Use Hibernate Validator if needed. 2. Supported universally across the framework. • Configuration classes, entities, controllers, etc. 3. Benefits: • Reflection and runtime proxy free. • Smaller footprint (1.4MB less). • Faster startup (200+ ms less). • Compile-time validation. • GraalVM support out of the box. 15 Copyright © 2024, Oracle and/or its affiliates

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Graal A full stack for the development and deployment of high performance Java cloud native applications

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What is Graal Development Kit for Micronaut? Copyright © 2024, Oracle and/or its affiliates 23 BUILT FOR GRAALVM NATIVE IMAGE Easily compile ahead-of-time with GraalVM Native Image into small executables that start instantly, and use less memory/CPU. CLOUD-AGNOSTIC MODULES A curated set of Micronaut modules that provide platform-independent support for core cloud services – object store, secrets, streaming, and more. DEV TOOLS AND VS CODE EXTENSIONS Dev tools to generate multicloud application starter templates. VS Code extensions for local development and cloud deployment.

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Micronaut and GraalVM 6ms As low as startup time 18MB Consuming memory footprint >30% Increased throughput up to and reduced latency

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Micronaut and GraalVM 1. The best integration possibly, supported by teams working together at Oracle Labs. • GraalVM EE includes optimisations for Micronaut for increased performance and throughput. • GraalVM EE license included in Oracle Cloud. 2. Micronaut is ready for GraalVM Native Image since day 1. • No reflection, no runtime proxies, no bytecode generation, no dynamic classloading. 3. GraalVM tooling for Visual Studio Code and Intellij IDEA. 30 Copyright © 2024, Oracle and/or its affiliates

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GraalVM Reachability Metadata Repository Community-driven collection of GraalVM reachability metadata for open-source libraries. • Actively maintained by a collective effort of VMware, Oracle and others. • Enabled in GraalVM Native Build Tools (Maven and Gradle plugins). • Integrated by default in Spring Boot and Micronaut. 31 Copyright © 2024, Oracle and/or its affiliates

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Micronaut and GraalVM powering Disney+ 35 Copyright © 2024, Oracle and/or its affiliates https://aws.amazon.com/blogs/opensource/improving-developer-productivity-at-disney-with-serverless-and-open-source/