Getting Started with the Micronaut Framework

Presentation at Community Over Code EU 2024.

1. Bratislava, Slovakia. June 3-5, 2024 Getting Started with the Micronaut Framework Sergio del Amo Caballero
2. Copyright © 2024 by Micronaut Foundation All rights reserved. Sergio del Amo https://sergiodelamo.com @sdelamo Member of the Micronaut Foundation Board of Directors Micronaut Developer Advocate Involved with Micronaut since its inception. Micronaut Core committer. Micronaut Guides. Micronaut Starter, Security, AWS, Views, RSS, Problem+JSON, Email, 2
3. Copyright © 2024 by Micronaut Framework All rights reserved. 3
4. Copyright © 2024 by Micronaut Framework All rights reserved. OPEN-SOURCE LICENSE 4 Apache 2.0
5. Copyright © 2024 by Micronaut Framework All rights reserved. LANGUAGE AGNOSTIC 5
6. Copyright © 2024 by Micronaut Framework All rights reserved. SUPPORTED JAVA VERSIONS 6 21 17
7. Copyright © 2024 by Micronaut Foundation All rights reserved. Modern JVM Framework ❖ Micronaut was designed from scratch in 2017, focused on modern architectures like microservices and serverless, with the cloud in mind. 7 All application types ❖ Micronaut is a complete solution for any type of application: microservices, message-driven producers or consumers, command-line apps, serverless functions Highly optimized ❖ Micronaut leverages Java annotation processors and other optimizations to compute the framework infrastructure at compile-time, drastically reducing startup time and memory consumption.
8. Copyright © 2024 by Micronaut Foundation All rights reserved. AOT: Ahead of Time 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. 8
9. Copyright © 2024 by Micronaut Foundation All rights reserved. Configuration Dependency Injection ❖ Can use JSR-330 (@Inject) annotations 9 ❖ Properties, YAML, TOML, Groovy, Config4K. Validation support ❖ Built-in reflection free, faster startup, smaller JAR, reduced memory. ❖ Hibernate Validation: full Bean Validation API compliance. AOP: Aspect-Oriented Programing ❖ Compile-time, reflection free. HTTP Client ❖ Micronaut includes an HTTP client that has both a low-level API and a higher-level AOP-driven API.
10. Copyright © 2024 by Micronaut Framework All rights reserved. BUILD AGNOSTIC 10
11. Copyright © 2024 by Micronaut Framework All rights reserved. TEST FRAMEWORK AGNOSTIC 11
12. Copyright © 2024 by Micronaut Framework All rights reserved. ❖ RxJava 2 ❖ RxJava 3 ❖ Project Reactor REACTIVE LIBRARY AGNOSTIC 12
13. Copyright © 2024 by Micronaut Framework All rights reserved. CLOUD AGNOSTIC 13
14. Copyright © 2024 by Micronaut Foundation All rights reserved. SERVERLESS 14
15. Copyright © 2024 by Micronaut Foundation All rights reserved. GRAALVM NATIVE IMAGE 15
16. Copyright © 2024 by Micronaut Framework All rights reserved. RUNTIMES 16 Servlet
17. Copyright © 2024 by Micronaut Framework All rights reserved. MESSAGING 17
18. Copyright © 2024 by Micronaut Framework All rights reserved. DATABASE MIGRATION TOOLS 18
19. Copyright © 2024 by Micronaut Framework All rights reserved. PERSISTENCE 19
20. Copyright © 2024 by Micronaut Framework All rights reserved. VIEWS 20 Server Side View Redendering Pebble Rocker Soy
21. Copyright © 2024 by Micronaut Framework All rights reserved. TRACING 21
22. Copyright © 2024 by Micronaut Framework All rights reserved. SERVICE DISCOVERY 22
23. Copyright © 2024 by Micronaut Framework All rights reserved. SECURITY 23 Security OAuth 2.0 OpenID Connect LDAP BasicAuth JWT
24. Copyright © 2024 by Micronaut Foundation All rights reserved. Error Handling ❖ Vnd.Error ❖ Problem+JSON 24
25. Copyright © 2024 by Micronaut Foundation All rights reserved. Monitoring ❖ Micrometer ❖ JMX 25 API ❖ GRAPHQL ❖ GRPC ❖ Open API Containers ❖ Kubernetes K8S MISC ❖ Cache ❖ Email ❖ Picocli ❖ RSS Search ❖ Elasticsearch ❖ OpenSearch
26. Copyright © 2024 by Micronaut Foundation All rights reserved. ROUTING ❖ @Controller ❖ @Get @Post @Patch @Update @Delete ❖ JAX-RS 26
27. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 27 Micronaut + Groovy ♥
28. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 28 MICRONAUT IS WRITTEN WITH JAVA. IT IS TESTED WITH SPOCK
29. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 29 MICRONAUT LAUNCH - GROOVY/SPOCK
30. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 30 MICRONAUT CLI - GROOVY/SPOCK
31. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 31 Groovy Specific Modules Dependency Description micronaut-inject-groovy Include AST transformations to generate bean definitions. Should be compileOnly on your classpath. micronaut-runtime-groovy Adds the ability to specify configuration placed in src/main/resources in Groovy format (i.e. application.groovy) micronaut-function-groovy Include AST transforms that make it easier to write Functions for AWS Lambda
32. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 32 Groovy Specific Modules
33. © 2019, Object Computing, Inc. (OCI). All rights reserved. objectcomputing.com 33 Singleton ⚠ Make sure to use jakarta.inject.Singleton when declaring a singleton bean. Groovy automatically imports groovy.lang.Singleton
34. Copyright © 2024 by Micronaut Foundation All rights reserved. DEMO 34
35. Copyright © 2024 by Micronaut Foundation All rights reserved. Q & A 35
36. Copyright © 2024 by Micronaut Foundation All rights reserved. RESOURCES ❖ https://micronaut.io ❖ https://docs.micronaut.io ❖ https://guides.micronaut.io ❖ https://micronaut.io/blog ❖ https://github.com/micronaut-projects ❖ https://micronaut.io/foundation ❖ https://micronaut.io/commercial-support 36