This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Boot 3.4.0!spring-doc.cn

Class Data Sharing

Class Data Sharing (CDS) is a JVM feature that can help reduce the startup time and memory footprint of Java applications.spring-doc.cn

To use it, you should first perform a training run on your application in extracted form:spring-doc.cn

$ java -Djarmode=tools -jar my-app.jar extract --destination application
$ cd application
$ java -XX:ArchiveClassesAtExit=application.jsa -Dspring.context.exit=onRefresh -jar my-app.jar

This creates an application.jsa file that can be reused as long as the application is not updated.spring-doc.cn

To use the cache, you need to add an extra parameter when starting the application:spring-doc.cn

$ java -XX:SharedArchiveFile=application.jsa -jar my-app.jar

For more details about CDS, refer to the CDS how-to guide and the Spring Framework reference documentation.