This project can be used as a starting point to create your own Hilla application with Spring Boot. It contains all the necessary configuration and some placeholder files to get you started.

The project is a standard Maven project. To run it from the command line, type mvnw (Windows), or ./mvnw (Mac & Linux), then open http://localhost:8080 in your browser.

You can also import the project to your IDE of choice as you would with any Maven project.

To create a production build, call mvnw clean package -Pproduction (Windows), or ./mvnw clean package -Pproduction (Mac & Linux). This will build a JAR file with all the dependencies and front-end resources, ready to be deployed. The file can be found in the target folder after the build completes.

Once the JAR file is built, you can run it using java -jar target/myapp-1.0-SNAPSHOT.jar (NOTE, replace myapp-1.0-SNAPSHOT.jar with the name of your jar).

• Read the documentation at hilla.dev/docs.
• Ask questions on Stack Overflow or join our Discord channel.
• Report issues, create pull requests in GitHub.

To build the Dockerized version of the project, run

mvn clean package -Pproduction
docker build . -t vaadin-24-postgresql:latest

Once the Docker image is correctly built, you can test it locally using

docker run -p 8080:8080 vaadin-24-postgresql:latest

We assume here that you have the Kubernetes cluster from Docker Desktop running (can be enabled in the settings).

First build the Docker image for your application. You then need to make the Docker image available to you cluster. With Docker Desktop Kubernetes, this happens automatically. With Minikube, you can run eval $(minikube docker-env) and then build the image to make it available. For other clusters, you need to publish to a Docker repository or check the documentation for the cluster.

The included kubernetes.yaml sets up a deployment with 2 pods (server instances) and a load balancer service. You can deploy the application on a Kubernetes cluster using

kubectl apply -f kubernetes.yaml

If everything works, you can access your application by opening http://localhost:8000/. If you have something else running on port 8000, you need to change the load balancer port in kubernetes.yaml.

Tip: If you want to understand which pod your requests go to, you can add the value of VaadinServletRequest.getCurrent().getLocalAddr() somewhere in your UI.

If something is not working, you can try one of the following commands to see what is deployed and their status.

kubectl get pods
kubectl get services
kubectl get deployments

If the pods say Container image "vaadin-24-postgresql:latest" is not present with pull policy of Never then you have not built your application using Docker or there is a mismatch in the name. Use docker images ls to see which images are available.

If you need even more information, you can run

kubectl cluster-info dump

that will probably give you too much information but might reveal the cause of a problem.

If you want to remove your whole deployment and start over, run

kubectl delete -f kubernetes.yaml