Serverless Java: Challenges and Triumphs

on YouTube ↗49m

" summary

Examines using Java on the Fn Project: a container-native Java FDK that builds with Maven, runs local unit tests, packages functions as Docker images and keeps idle containers paused for quick reuse. Demonstrates FN Flow with CompletionStage for composing functions, and shows concrete tooling for smaller, faster images via jlink and Graal/SubstrateVM native images — example images shrink from ~266MB to ~20MB and cold-start drops from ~1.15s to ~0.61s. Also explores isolates for per-invocation isolation.

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" chapters (10)

1. 0:00Start
2. 5:00The Story about Java and Serverless
3. 12:04Portability
4. 21:55Building Complex Applications
5. 22:16Fn Flow
6. 26:14Weather Forecast Function
7. 31:42Fast Startup
8. 32:03Class Data Sharing
9. 33:02Ahead of Time Compilation
10. 33:24Smaller Docker Images

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