OpenRewrite, AOT and CDS

The cheat code

./mvnw -U org.openrewrite.maven:rewrite-maven-plugin:run \
 -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-spring:LATEST \
 -DactiveRecipes=org.openrewrite.java.spring.boot3.UpgradeSpringBoot_3_3

The Spoiler

#### Comparison of memory usage and startup times

Configuration                       Startup Time (seconds)    (MB) Used       (MB) Savings
--------------------------------------------------------------------------------------------
Spring Boot 2.6 with Java 8         1.018                     340.6           -
Spring Boot 3.3 with Java 23        1.014 (1.00% faster)      239.3           30.00% 
Spring Boot 3.3 extracted           0.867 (15.00% faster)     210.6           39.00% 
Spring Boot 3.3 with AOT processing 0.765 (25.00% faster)     205.7           40.00% 
Spring Boot 3.3 with CDS            0.568 (45.00% faster)     208.2           39.00% 
Spring Boot 3.3 with AOT+CDS        0.383 (63.00% faster)     165.5           52.00% 
--------------------------------------------------------------------------------------------

Does that look too good to be true? Run the demo and see for yourself!

Prerequisites

• SDKMan

  i.e. curl -s "https://get.sdkman.io" | bash

• Httpie needs to be in the path

  i.e. brew install httpie

• bc, pv, zip, unzip, gcc, zlib1g-dev

  i.e. sudo apt install bc, pv, zip, unzip, gcc, zlib1g-dev -y

• Vendir

  i.e. brew tap carvel-dev/carvel && brew install vendir

Quick Start

./demo.sh

Attributions

• Demo Magic is pulled via vendir sync

References

• Spring Boot CDS Support and Project Leyden anticipation
• AOT processing
• Paketo Buildpacks
• Tanzu Buildpacks

Related Videos

• https://www.youtube.com/live/HBBCDoY4sUQ?si=jLrgZFzo6Iqm1RjA
• https://www.youtube.com/live/qQAXXwkaveM?si=4KunXZaretBrPZs3
• https://www.youtube.com/live/ck4AP7kRQkc?si=lDl203vbfZysrX5e
• https://www.youtube.com/live/VWPrYcyjG8Q?si=z7Q2Rm_XOlBwCiei