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Serverless Spring Boot on AWS Lambda Using SnapStart
- AWS Lambda SnapStart significantly reduces cold start times for Spring Boot applications by pre-initializing and snapshotting the runtime state.
- SnapStart is available for Java 11 and 17 runtimes and supports Amazon Corretto.
- Spring Boot apps traditionally had long startup times due to classpath scanning, dependency injection, and auto-configuration, making them unsuitable for high-performance serverless workloads.
- SnapStart can reduce the startup delay for Spring Boot serverless apps to under 300ms.
- To enable SnapStart, Java 11+ Lambda functions deployed using Zip package type need specific configurations in AWS SAM or Serverless Framework.
- Enabling SnapStart has shown up to a 90% reduction in cold start latency for Spring Boot functions.
- Best practices for deploying Spring Boot with SnapStart include using versions & aliases, tuning JVM flags, and monitoring with CloudWatch.
- SnapStart is limited to Java 11 and 17, Zip-based Lambda deployments, and may have issues with reflection-heavy frameworks.
- With SnapStart, Spring Boot on AWS Lambda becomes practical for production use, offering the Spring ecosystem's power with serverless scalability.
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