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Add How-To Guide for building images with CDS and buildpacks
Closes gh-40762
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[[howto.class-data-sharing]]
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= Class Data Sharing
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This section includes information about using Class Data Sharing (CDS) with Spring Boot applications.
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For an overview of Spring Boot support for CDS, see xref:reference:packaging/class-data-sharing.adoc[Class Data Sharing].
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[[howto.class-data-sharing.buildpacks]]
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== Packaging an Application Using CDS and Buildpacks
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Spring Boot's xref:reference:packaging/container-images/cloud-native-buildpacks.adoc[support for Cloud Native Buildpacks] along with the https://paketo.io/docs/reference/java-reference[Paketo Java buildpack] and its https://paketo.io/docs/reference/java-reference/#spring-boot-applications[Spring Boot support] can be used to generate a Docker image containing a CDS-optimized application.
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To enable CDS optimization in a generated Docker image, the buildpack environment variable `BP_JVM_CDS_ENABLED` should be set to `true` when building the image as described in the xref:maven-plugin:build-image.adoc#build-image.examples.builder-configuration[Maven plugin] and xref:gradle-plugin:packaging-oci-image.adoc#build-image.examples.builder-configuration[Gradle plugin] documentation.
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This will cause the buildpack to do a training run of the application, save the CDS archive in the image, and use the CDS archive when launching the application.
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The buildpack environment variable `BP_SPRING_AOT_ENABLED` can also be set to `true` to enable AOT mode along with CDS when running an application that has been xref:reference:packaging/aot.adoc[built with Ahead-of-Time processed].
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The Paketo Buildpack for Spring Boot https://github.com/paketo-buildpacks/spring-boot?tab=readme-ov-file#configuration[documentation] has information on other configuration options that can be enabled with builder environment variables.
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** xref:how-to:native-image/index.adoc[]
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*** xref:how-to:native-image/developing-your-first-application.adoc[]
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*** xref:how-to:native-image/testing-native-applications.adoc[]
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** xref:how-to:class-data-sharing.adoc[]
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** xref:how-to:deployment/index.adoc[]
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*** xref:how-to:deployment/traditional-deployment.adoc[]
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*** xref:how-to:deployment/cloud.adoc[]
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Class Data Sharing (CDS) is a https://docs.oracle.com/en/java/javase/17/vm/class-data-sharing.html[JVM feature] that can help reduce the startup time and memory footprint of Java applications.
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To use it, you should first perform a training run on your application in exploded form:
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To use it, you should first perform a training run on your application in extracted form:
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[source,shell]
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----
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