This is an update to the original blog post about creating docker images with Spring Boot 2.3. There were a few things related to image creation that changed between the first milestone of Spring Boot 2.3 and the GA release.
This is an update to the original blog post about creating docker images with Spring Boot 2.3.
There were a few things related to image creation that changed between the first milestone of Spring Boot 2.3 and the GA release.
The two new features introduced in Spring Boot 2.3 to help improve image creation techniques were: layered jars and buildpack support.
The layered jar feature evolved quite a bit as we started adding support for custom layers. While the need to express layers that the jar should be split into for image creation was evident, changing the format of the jar to do so no longer seemed necessary.
Spring Boot 2.3 includes support for layering a jar using a
layers.idx file. The layers index file provides a list of layers and the parts of the jar that should be contained within them. Layers are written in the order that they should be added to the Docker/OCI image.
By default, the following layers are defined:
dependenciesfor any dependency whose version does not contain
spring-boot-loaderfor the jar loader classes.
snapshot-dependenciesfor any dependency whose version contains
applicationfor application classes and resources.
On behalf of the team and everyone who has contributed, I’m happy to announce that Spring Boot 2.3.2 has been released and is now available from repo.spring.io and Maven Central. This release includes 88 bug fixes, enhancements, documentation improvements, and dependency upgrades. Thanks to all those who have contributed with issue reports and pull requests.
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