Supercharge your JVM performance with Project Leyden and Spring Boot
summary
Project Leyden features in Java 25 via an AOT cache that records a training run (XXAOT mode record / XXAOT cache output) and speeds startup by preloading class linking and profiling. Extracting a Spring Boot fat JAR removes nested-classloader overhead (start 3s → 2.4s), adding the AOT cache and spring AOT drops time-to-first-request to ~0.6–0.95s (3x–5x improvement) while cutting CPU during startup ~2.6x; cache requires identical JDK/architecture.
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chapters (23)
- 0:00JVM performance with Leyden
- 1:27Talk goals and Leyden overview
- 3:34Java dynamic observation and JIT
- 5:58AOT cache in JDK 25
- 10:11Leyden vs GraalVM and others
- 11:33Demo: Pet Clinic startup time
- 13:39AOT cache with Spring Boot
- 15:45Extracting Spring Boot jars
- 16:28Training run with Spring Boot
- 18:32Demo: AOT cache with extracted jar
- 20:56Spring AOT benefits
- 22:44Demo: AOT cache + Spring AOT
- 24:11JDK 25 profiling improvements
- 27:20Leyden and JDK 26 next steps
- 29:05Demo: Leyden ahead-of-time compilation
- 32:34Leyden trade-offs
- 35:20Future Spring Boot improvements
- 37:26Summary and training runs
- 38:52Q&A: Cache deployment
- 40:02Q&A: Training run impact
- 41:29Q&A: Fast startup priorities
- 42:51Q&A: Leyden vs GraalVM/CRaC
- 44:55Closing remarks
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