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Taking Micronaut out for a spin

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Andres Almiray
Andres Almiray

The document discusses Micronaut, a new Java framework that aims to address challenges of serverless and microservices environments. It focuses on ahead-of-time (AOT) compilation using GraalVM to improve startup times and reduce memory usage compared to frameworks like Spring that rely heavily on reflection and dynamic classloading. The document demonstrates how Micronaut can help modernize Java applications for microservices through AOT compilation and provides resources for learning more.

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@aalmiray | andresalmiray.com Taking Micronaut out for a spin
Andres Almiray Seasoned Sourceror @ Oracle Apache Groovy PMC Java Champion Hackergarten github.com/aalmiray
@aalmiray | andresalmiray.com Background
@aalmiray | andresalmiray.com Serverless Challenges • For Java, the serverless/microservices world is different than the big application server world. • Existing tools not optimised for cold starts, low memory usage, fast startup, etc. • Alternatives as Go, Node fare better in these regards.
@aalmiray | andresalmiray.com Containers everywhere! • Containers have become the deployment unit. • Special care needed for memory management when running Java on containers. • Memory usage requires optimizations.
@aalmiray | andresalmiray.com Spring? • Spring Boot lowered the bar to get started with code. • A lot of magic is found under the covers, and unfortunately at runtime too • Classpath scanning • Synthethizes new annotations • Heavy use of reflection
Taking Micronaut out for a spin
Taking Micronaut out for a spin
@aalmiray | andresalmiray.com Java’s ailments for framework authors • Limited Annotation API • Type Erasure • Slow Reflection • Reflective Data Caches • Classpath Scanning • Slow Dynamic Class Loading
@aalmiray | andresalmiray.com Why Java then? • Mature, robust ecosystem • Excellent IDE support • Code maintenance and refactoring • Build system maturity • Diverse deployments (mobile, server, client, IoT) • Diverse languages (Java, Groovy, Kotlin, Scala, …) • Developers! Developers! Developers!
Taking Micronaut out for a spin
@aalmiray | andresalmiray.com • A Microservices and Serverless focused framework. • Also a d complete application framework for any type of application: cli, webapp, android, swing. • Brings all the features you know and love: • Dependency Injection, AOP, Configuration Management, Bean Introspection, and more…
@aalmiray | andresalmiray.com • Reflection free • Runtime proxy free • No dynamic class loading • AOT compilation • Graal Native Image ready
@aalmiray | andresalmiray.com • A new universal Virtual Machine from Oracle • JIT compiler written in Java • Features a Native Image tool • Converts Java -> native code using AOT • Even lower startup and memory consumption!
Taking Micronaut out for a spin
DEMO
@aalmiray | andresalmiray.com Static Compilation of Java Applications at Alibaba at Scale • https://medium.com/graalvm/static-compilation-of-java- applications-at-alibaba-at-scale-2944163c92e • Switching to Graal led to • Faster startup times • Improved GC performance
@aalmiray | andresalmiray.com Spring -> Micronaut • https://micronaut-projects.github.io/micronaut-spring/ latest/guide/ • Spring annotations can be used with Micronaut’s Compile time support. • Enables smooth migration from Spring into Micronaut.
@aalmiray | andresalmiray.com Summary • Micronaut and GraalVM are leading the AOT revolution • Server side Java is adapting to the server less world • AOT sacrifices compilation speed to gain more at deployment/production • Native image provide additional benefits
@aalmiray | andresalmiray.com Resources • https://micronaut.io/launch/ • https://micronaut.io/documentation.html • https://guides.micronaut.io/ • https://docs.micronaut.io/latest/guide/index.html#graal • https://www.oracle.com/database/technologies/maven- central-guide.html • https://www.oracle.com/cloud/free/
Taking Micronaut out for a spin
@aalmiray | andresalmiray.com

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Taking Micronaut out for a spin

  • 2. Andres Almiray Seasoned Sourceror @ Oracle Apache Groovy PMC Java Champion Hackergarten github.com/aalmiray
  • 4. @aalmiray | andresalmiray.com Serverless Challenges • For Java, the serverless/microservices world is different than the big application server world. • Existing tools not optimised for cold starts, low memory usage, fast startup, etc. • Alternatives as Go, Node fare better in these regards.
  • 5. @aalmiray | andresalmiray.com Containers everywhere! • Containers have become the deployment unit. • Special care needed for memory management when running Java on containers. • Memory usage requires optimizations.
  • 6. @aalmiray | andresalmiray.com Spring? • Spring Boot lowered the bar to get started with code. • A lot of magic is found under the covers, and unfortunately at runtime too • Classpath scanning • Synthethizes new annotations • Heavy use of reflection
  • 9. @aalmiray | andresalmiray.com Java’s ailments for framework authors • Limited Annotation API • Type Erasure • Slow Reflection • Reflective Data Caches • Classpath Scanning • Slow Dynamic Class Loading
  • 10. @aalmiray | andresalmiray.com Why Java then? • Mature, robust ecosystem • Excellent IDE support • Code maintenance and refactoring • Build system maturity • Diverse deployments (mobile, server, client, IoT) • Diverse languages (Java, Groovy, Kotlin, Scala, …) • Developers! Developers! Developers!
  • 12. @aalmiray | andresalmiray.com • A Microservices and Serverless focused framework. • Also a d complete application framework for any type of application: cli, webapp, android, swing. • Brings all the features you know and love: • Dependency Injection, AOP, Configuration Management, Bean Introspection, and more…
  • 13. @aalmiray | andresalmiray.com • Reflection free • Runtime proxy free • No dynamic class loading • AOT compilation • Graal Native Image ready
  • 14. @aalmiray | andresalmiray.com • A new universal Virtual Machine from Oracle • JIT compiler written in Java • Features a Native Image tool • Converts Java -> native code using AOT • Even lower startup and memory consumption!
  • 16. DEMO
  • 17. @aalmiray | andresalmiray.com Static Compilation of Java Applications at Alibaba at Scale • https://medium.com/graalvm/static-compilation-of-java- applications-at-alibaba-at-scale-2944163c92e • Switching to Graal led to • Faster startup times • Improved GC performance
  • 18. @aalmiray | andresalmiray.com Spring -> Micronaut • https://micronaut-projects.github.io/micronaut-spring/ latest/guide/ • Spring annotations can be used with Micronaut’s Compile time support. • Enables smooth migration from Spring into Micronaut.
  • 19. @aalmiray | andresalmiray.com Summary • Micronaut and GraalVM are leading the AOT revolution • Server side Java is adapting to the server less world • AOT sacrifices compilation speed to gain more at deployment/production • Native image provide additional benefits
  • 20. @aalmiray | andresalmiray.com Resources • https://micronaut.io/launch/ • https://micronaut.io/documentation.html • https://guides.micronaut.io/ • https://docs.micronaut.io/latest/guide/index.html#graal • https://www.oracle.com/database/technologies/maven- central-guide.html • https://www.oracle.com/cloud/free/