How Class Data Sharing Can Speed up Your Jakarta EE Application Startup
summary
Shows how to use JDK 17 class data sharing to precompute a classlist dump and build a shared archive so a Jakarta EE app with ~14k classes launches much faster without code changes. Compares OpenJ9 vs HotSpot/OpenJDK behavior and commands, demonstrates creating the archive (classlist → dump → use at startup), and measures startup improvements commonly in the 5–10 second range (examples drop ~6s → ~4.3s) and memory savings around 5–10% in Docker; warns about dynamic proxies/reflection and platform/permission caveats.
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chapters (4)
- 0:00Start
- 10:31Improvements? Can we improve this?
- 15:16Why Fast Startup Important? • Large surge in requests
- 18:14Class Data Sharing - CDS • Load, verify, derive - Perform upfront Store info in memory mapped read-only file
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