Afraid of Java Cold Starts in Serverless? Fear Not, Java is Super Fast!
Talkat JCON Europe 2023 · on Wednesday, 2023-06-21· at 16:00· Cinema 7, Im Mediapark 1, 50670 Köln, Germany·
summary
Plain Java starts in milliseconds on a laptop (measured ~67 ms local), full Java EE servers take seconds (GlassFish >5s), Quarkus with build‑time optimizations boots around Quarkus 890 ms, Spring Boot about 1.7s, but a minimal Piranha engine runs ~Piranha 200 ms and without the HTTP stack ~Piranha 100 ms. On AWS Lambda a cold init with Piranha measures ~500 ms cold start then subsequent invocations drop to ~2 ms; options discussed include JVM tuning, AWS SnapStart and GraalVM native images.
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chapters (14)
- 0:00Introduction to Java in serverless
- 1:27What is AWS Lambda and cold starts
- 8:11Java startup speed in AWS Lambda
- 11:45Local Java startup performance demo
- 15:52Java EE vs plain Java startup times
- 16:12Optimizing Jakarta EE for fast starts
- 17:16Quarkus framework deep dive
- 24:31How Quarkus works under the hood
- 28:44Piranha Cloud framework introduction
- 32:20Piranha Cloud startup demo
- 39:23Running Piranha Cloud in AWS Lambda
- 44:07Optimizing JVM and resources
- 46:58AWS SnapStart and JVM optimizations
- 49:27Conclusion and framework choices
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