Java example spring boot application

A simple spring-boot application created with Spring Initializr.

• Micrometer metrics are enabled and exposed with Prometheus (##2)
  • We have a custom metric

Build / deploy

Build:

cd ../spring-app
./mvnw package spring-boot:build-image

This builds and sets up the image (##3) with JiB. The setup takes a considerable amount of time... You get an image primed with a rather obtuse setup with values you might want to adjust.

See:

• https://github.com/GoogleContainerTools/jib?tab=readme-ov-file#jib
• https://github.com/paketo-buildpacks/spring-boot
• https://github.com/paketo-buildpacks/bellsoft-liberica?tab=readme-ov-file#configuration

Alternative jib build

Just build the image yourself. Instructions: https://docs.spring.io/spring-boot/reference/packaging/container-images/dockerfiles.html

cd ../spring-app

./mvnw package 
docker build -t k8sdebug:manual .

Deploy image to kind

kind load docker-image k8sdebug:0.0.1-SNAPSHOT --name k8sdebug

kind load docker-image k8sdebug:manual --name k8sdebug