Software Engineering Daily

Technical interviews about software topics.


Superfast JVM Startup with Gerrit Grunwald

CRaC (Coordinated Restore at Checkpoint) is a new technology that can improve startup and warmup times by orders of magnitude. It is a project of OpenJDK that was proposed and led by Azul. The CRaC Project defines public Java APIs that allow for the coordination of resources during checkpoint and restore operations. With CRaC, a checkpoint can be set at any point where an application can be safely paused. Azul is releasing a reference implementation of CRaC in JDK 17 with the Azul Zulu Build of OpenJDK for x86 64-bit Linux update. CRaC allows for an “instant” start at any point in the application lifecycle at an optimal speed. ​It also work’s really well with Azul’s ReadyNow! feature that optimizes warm-up. For the first time, developers will have a TCK-tested, CRaC-configured, production-ready JVM with commercial support available for their use.

Gerrit Grunwald is a Java Champion & Principle Engineer at Azul and he joins us in this episode.

Full disclosure: Azul is a sponsor of Software Engineering Daily.

Alex is an AWS Data Hero, an independent consultant, and the author of The DynamoDB Book, the comprehensive guide to data modeling with DynamoDB. He was an early employee at Serverless, Inc., creators of the Serverless Framework, and was an early community member in the serverless space. His consulting and training work focuses on serverless architectures and database optimization. You can find him on Twitter as @alexbdebrie or on his site,

Sponsorship inquiries: Transcript

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 2023-06-26  49m