Migrate from spring-kafka to native Apache Kafka client

[ctamisier]

PR candidate for fixing #9287

[pascalgrimaud]

As you updated the properties here, you need to do the same for :

• local app.yml
• docker-compose sub gen
• kubernetes sub gen
• openshift sub gen
• etc

[pascalgrimaud]

Just tested and it works ! Really great job @ctamisier
I added some minor comments.

The most important missing part is the properties in YAML files for docker-compose, k8s etc.

[ctamisier]

Thanks for the review !
I've pushed some changes and I need to update the Gradle part as well.

[pascalgrimaud]

@ctamisier : don't hesitate to ping me as soon as you update this PR, so I can have a look again. If you don't have time, just tell me, I'll help you to update this, as I'd like to have this for the next release and start contribution on the entity part + Kafka

[ctamisier]

Since your last review I applied the following changes:

• Add Gradle support (build.gradle.ejs)
• Add <logger name="org.apache.kafka" level="INFO"/> (org.apache is in WARN) (To be discussed eventually)
• Remove <logger name="kafka" level="WARN"/> and <logger name="org.I0Itec" level="WARN"/>

I'm not really good about docker compose file definition... I tried to make docker-compose -f src/main/docker/app.yml up working but the app can't connect to kafka.

I don't know what generator-jhipster/test/templates/compose/09-kafka/src/main/docker/kafka.yml is for, so I didn't modify it. Should it be a "generation" of generator-jhipster/generators/server/templates/src/main/docker/kafka.yml.ejs ? (same with app.yml and app.yml.ejs)

We still need to adjust app.yml.ejs (I've an issue now because I use depends_on in kafka.yml.ejs).

Your help @pascalgrimaud is really welcome, I'm kind of learning docker-compose right now and I might not have the "Best Practices" to apply on this part.

[pascalgrimaud]

ok @ctamisier
I'll start the work on this PR tonight or tomorrow and will probably commit directly to your branch

[pascalgrimaud]

Just done the review and the tests.
Everything works fine ! So going to merge this as soon as the CI is green.

good job @ctamisier and @clement26695 !

@ctamisier : plz, don't rebase / force push, otherwise, we will lost our work here :)