Helidon Example: quickstart-se

This example implements a simple Hello World REST service.

Prerequisites

1. Maven 3.5 or newer
2. Java SE 8 or newer
3. Docker 17 or newer to build and run docker images
4. Kubernetes minikube v0.24 or newer to deploy to Kubernetes (or access to a K8s 1.7.4 or newer cluster)
5. Kubectl 1.7.4 or newer to deploy to Kubernetes

Verify prerequisites

java --version
mvn --version
docker --version
minikube version
kubectl version --short

Build

mvn package

Start the application

java -jar target/quickstart-se.jar

Exercise the application

curl -X GET http://localhost:8080/greet
{"message":"Hello World!"}

curl -X GET http://localhost:8080/greet/Joe
{"message":"Hello Joe!"}

curl -X PUT http://localhost:8080/greet/greeting/Hola
{"gretting":"Hola"}

curl -X GET http://localhost:8080/greet/Jose
{"message":"Hola Jose!"}

Build the Docker Image

docker build -t quickstart-se target

Start the application with Docker

docker run --rm -p 8080:8080 quickstart-se:latest

Exercise the application as described above

Deploy the application to Kubernetes

kubectl cluster-info                # Verify which cluster
kubectl get pods                    # Verify connectivity to cluster
kubectl create -f target/app.yaml   # Deply application
kubectl get service quickstart-se  # Get service info