Micronaut CRaC

on YouTube ↗35m

" summary

Micronaut adds an integration that uses OpenJDK CRaC to snapshot JVM state and restart from a hot image, packaged via a Gradle/Maven Docker build:crac task that embeds an ASO JDK with CRaC. Adds an order resource API plus a checkpoint simulator for tests, recommends eager singletons and allows Hikari + Micronaut Data JDBC to be checkpointed. Measured startup drops from ~650–700 ms to ~100–150 ms, and a DB-backed app from ~1 s to ~100–200 ms. Linux only, requires CRaC-enabled JDK.

AI-written summary · about

" chapters (11)

1. 0:00Introduction to Micronaut CRaC
2. 3:18What is CRaC and why it matters
3. 7:13Micronaut framework overview
4. 15:02Setting up Micronaut CRaC
5. 18:16Creating and restoring checkpoints
6. 21:56Demo: Simple Micronaut app
7. 26:17Demo: Measuring startup time
8. 27:42Demo: Docker with CRaC
9. 29:54Demo: Database integration
10. 33:34Demo: Performance comparison
11. 34:16Resources and Q&A

" related talks

• 51mJava on CRaC Superfast JVM Application StartupGerrit Grunwald, Simon Ritter · Devnexus 2022
• 46mDeveloper experience in a modern Java frameworkÁLVARO SÁNCHEZ · Voxxed Days Thessaloniki 2023
• 45mIntruduction to Micronaut 2.0Graeme Rocher · JCON 2020
• 53mJava on CRaC: Superfast JVM Application StartupSimon Ritter · Jfokus 2022
• 57mIntroduction to Micronaut 2.0Graeme Rocher · Developer Summit 2020
• 48mMicronaut Deep DiveGraeme Rocher · Voxxed Days Microservices 2019
• 46mUnleash the power of your applications with Micronaut and GraalVMÁlvaro Sánchez-Mariscal · Voxxed Days Luxembourg 2022
• 55mUnleash the power of your applications with Micronaut and GraalVMÁLVARO SÁNCHEZ · GeeCON 2024