Slido

https://sli.do
#geecon2019

Room 6

Reflection-Free Applications with Micronaut 

Vladimír Oraný

Software Developer @ Agorapulse

@musketyr

@Agorapulse

About Me

• Vladimír Oraný
• Software Developer @ Agorapulse
• Groovy Developer for 10 years
  • Gaelyk
  • Grails
  • Micronaut
• Testing & DSL Enthusiast 
• Toolsmith
  • Spreadsheet Builder
  • Dru & Gru Testing Frameworks
  • Agorapulse Micronaut Libraries
  • Agorapulse Testing Libraries
    • OfficeUnit

Agenda

• Problems of Current Java Frameworks
  • Why Reflection-Free Matters?
  • Other Java's Problem
  • Why is cloud different?
• Micronaut Framework
  • HTTP Server
  • Bean Validation
  • Bean Introspection
  • Micronaut Data
  • GraalVM Integration
• Summary

Problems of Current Java Frameworks

Why Reflection-Free Matters?

• Reflection data are kept in memory unless GCed
• Using reflection is slower
• Breaks Ahead-of-Time compilation (GraalVM)

Other Java's Problem

• Limited annotation API
• Type erasure
• Classpath scanning
• Slow dynamic class loading

Why is Cloud Different?

• Cold starts
• Pricing model
  • Memory / CPU
  • Time spent

Micronaut

Micronaut Applications

Micronaut Ecosystem & Friends 

• MongoDB
• Open API
• Neo4j
• Netflix
• RSS
• RabitMQ
• Redis
• JDBC
• Security
• Views 1.3
• Spring

• AWS
• Micronaut Data
• ElasicSearch
• Flyway
• GRPC
• GraphQL
• Groovy
• Kafka
• Kubernates 1.3
• Liquibase
• Micrometer

Showtime

Micronaut + GraalVM + AWS Lambda

Summary

• Using reflection impacts memory and performance
• Reflection breaks AOT (read GraalVM)
• Micronaut Reflection-Free AOT
  • Bean Introspection
  • Validation
  • Data Access Layer
• Micronaut + GraalVM = BFF

Thank You

https://slides.com/musketyr/micronaut-geecon-2019

https://github.com/musketyr/geecon-lambda-function