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How to Fix CRaC Restore Failures in Java Using JDK 26 JFR Events

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Project CRaC has become the standard for achieving fast startup times in cloud-native Java microservices, but improper checkpoint handling can cause silent restore failures in production. Common pitfalls include leaving database connection pools and open sockets active during a checkpoint, which triggers hard exceptions and aborts the freeze process. JDK 26 introduces native JFR events — jdk.Checkpoint and jdk.Restore — that allow developers to profile freeze duration and identify which resources blocked a restore operation. Developers must implement the org.crac.Resource interface with strictly idempotent beforeCheckpoint and afterRestore hooks to ensure safe recovery in cloned environments. A centralized resource coordinator should drain active HTTP requests and close all file descriptors before the checkpoint engine runs.

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How to Fix CRaC Restore Failures in Java Using JDK 26 JFR Events · ShortSingh