This is an example of Spring Boot Getting Started modified to work on OpenJDK CRaC, which consists only in using Spring Boot 3.2+ and adding the org.crac:crac dependency (version 1.4.0 or later).

Use Maven to build

./mvnw package 

Please refer to README for details.

If you see an error, you may have to update your criu permissions with

sudo chown root:root $JAVA_HOME/lib/criu sudo chmod u+s $JAVA_HOME/lib/criu 

1. Run the JDK in the checkpoint mode

$JAVA_HOME/bin/java -XX:CRaCCheckpointTo=cr -jar target/example-spring-boot-0.0.1-SNAPSHOT.jar 

2. Warm-up the instance

siege -c 1 -r 100000 -b http://localhost:8080 

3. Request checkpoint

jcmd target/example-spring-boot-0.0.1-SNAPSHOT.jar JDK.checkpoint 

$JAVA_HOME/bin/java -XX:CRaCRestoreFrom=cr