hello-java-maven example with k8s deployment scripts

[octonato]

This is an example that uses reactive-lib and maven (but not sbt-reactive-app plugin, obviously) and provides k8s yml files to deploy the services.

The generated docker containers do not have any metadata (labels) and cannot be used with the rp tool. The yml files are generated by hand.

The rp-application.conf is also hand-written and it's stripped down to a minimal.

Services uses Akka Cluster Bootstrap for cluster formation and reactive-lib ServiceLocator based on akka-dns.

TODOs

• [x] add a README file with instructions
• [x] document when to use RBAC
• [x] document what to modify in the yml for production, currently setup for testing in Minikube using Lightbend's Helm chart
• [x] Ingress file for services

[ignasi35]

Hi @renatocaval the filecount on this PR looked weird and I noticed you've pushed some IDE-specific files (.settings/, .project, .classpath, xyz.iml, ...) is that intentional?

If those were pushed by mistake I guess the .gitignore in the root of the repo is incomplete.

[ignasi35]

I think integration-tests/ should be removed too.

Let's put this PR on a diet: If we could remove stream-xxx and the persitence code in hello-xxx it'd be great.

[octonato]

sure, for the eclipse files. I will remove it and do a force --push

also for the integration-tests

The stream and persistence I don't agree. I think we should be able to show how:

• we can configure Cassandra and Kafka to work in Minikube
• we need to be able to confirm that interservice communication is working

[octonato]

Removed what I mentioned above. Still, 2894 lines!

[TimMoore]

Agree that it's important to demonstrate end-to-end communication, Cassandra and Kafka.

[octonato]

fixed conflicts, I will wait for Travis to merge