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Overview

This sample demonstrates how to build and deploy a Java-based microservice as an extension and expose the API in SAP BTP, Kyma runtime.

extension

This sample demonstrates how to:

  • Create a development Namespace in the Kyma runtime.
  • Create and deploy a Spring Boot application in the Kyma runtime.
  • Expose the Spring Boot application using APIRules.
  • Explore the APIs.

Prerequisites

Application

The Spring Boot application implements a simple Orders API with CRUD operations.

Steps

Prepare for deployment

  • Create a new dev Namespace:
kubectl create namespace dev
  • Build and push the image to the Docker repository:
DOCKER_ACCOUNT={your-docker-account} make push-image

Kubernetes Deployment

This section details out deploying the extension using standard Kubernetes resources.

To deploy as Helm chart, please refer to Helm Chart Deployment

kubectl -n dev apply -f ./k8s/deployment.yaml
  • Verify that the Pods are up and running:
kubectl -n dev get po

The expected result shows that the Pod for the sample-extension-java Deployment is running:

Expose the API

  • Create an APIRule. In the APIRule, specify the Kubernetes Service that is exposed:
apiVersion: gateway.kyma-project.io/v1alpha1
kind: APIRule
metadata:
  name: sample-extension-java
spec:
  gateway: kyma-gateway.kyma-system.svc.cluster.local
  rules:
    - accessStrategies:
        - config: {}
          handler: noop
      methods:
        - GET
        - POST
        - PUT
        - DELETE
      path: /.*
  service:
    host: sample-extension-java
    name: sample-extension-java
    port: 8080

This sample snippet exposes the sample-extension-java Service. The Service is specified in the spec.service.name field. The sample-extension-java subdomain is specified in the spec.service.host field.

  • Apply the APIRule:
kubectl -n dev apply -f ./k8s/api-rule.yaml

Helm Chart Deployment

A Helm Chart definition is also available for developers to try out.

Must Haves

Helm install

To install the helm chart in dev namespace, run the following command. Change to use your image. You can also override other parameters defined in values.yaml

helm -n dev install kymaapp ../helm-charts/sample-extension-java --set image.repository=gabbi/sample-extension-java:0.0.7 --set jdbc.user={db user} --set jdbc.password={db password}

To verify, the installed chart, run helm -n dev ls

Try it out

Access the APIs through this URL: <https://sample-extension-java.{cluster domain}/orders>

Try out various APIs.