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Spring data JPA WITHOUT an entire Spring Boot application

I am creating an internal CLI that is communicating with a PostgreSQL database and the easiness to create a no-code repository is one of the features that convince me to choose Spring data JPA.
However, I am not able to find some tutorial or GitHub repository to set up a Spring data JPA project without an entire spring boot application.
On the project https://github.com/spring-projects/spring-data-book/tree/master/jpa there is no main entry point, so the code is not runnable and by the way, it was updated 8 years ago ...
This other StackOverflow thread Spring Data JPA without Spring Boot does not help me because the guy could run his spring application on Google Cloud Platform finally (that was the cause of why he ask how to setup sping data jpa without spring boot).
I don't know how to start, if you have any ideas I will be happy to discuss with someone who is more experienced than me.
Thank you.

This might help if no more complete tutorial turns up https://docs.spring.io/spring-data/jpa/docs/1.5.0.RELEASE/reference/html/repositories.html
Look for this section
Standalone usage
You can also use the repository infrastructure outside of a Spring container, e.g. in CDI environments. You still need some Spring libraries in your classpath, but generally you can set up repositories programmatically as well. The Spring Data modules that provide repository support ship a persistence technology-specific RepositoryFactory that you can use as follows
In particular it says you can use a factory to generate repositories:
RepositoryFactorySupport factory = … // Instantiate factory here
UserRepository repository = factory.getRepository(UserRepository.class);
So adding the spring parts that contain the spring data classes may be enough for this level and if you want to have DI, too, you likely need to combine them with the respective spring dependencies and configure a regular spring application.

Multiple Datasource with Micronautor or Quarkus

I want to migrate to Micronaut or Quarkus from Spring Boot, but in Spring boot there is one feature as AbstractRoutingDataSource, which in runtime change datasouce. Is there anything similar or any mechanism in micronaut or quarkus which gives opportunity to work with multiple datasources in runtime??
Spring-boot feature for reference https://medium.com/innomizetech/dynamic-multi-database-application-with-spring-boot-7c61a743e914

How to start Spring Boot server with ClassRule in JUnit4?

As I can see the there is the org.springframework.test.context.junit4.rules.SpringClassRule that is a ClassRule's equivalent to the org.springframework.test.context.junit4.SpringJUnit4ClassRunner.
However, I'd like to boot up my whole Spring Boot application with a ClassRule. Is there something like org.springframework.boot.test.contextSpringBootTest as a ClassRule?

There is a GitHub project that solves this issue: https://github.com/CarloWakefield/spring-boot-test-rule

Migration from Hibernate to EclipseLink in Spring Boot

I have an application created in Spring Boot https://github.com/JonkiPro/REST-Web-Services. I need to replace Hibernate provider with EclipseLink.The problem is that practically the entire configuration is found only in the application. properties https://github.com/JonkiPro/REST-Web-Services/blob/master/web/src/main/resources/application.yml file and I don't know what to change to EclipseLink.

There is an example project from Spring on how to use Spring Boot with EclipseLink. Please refer:
https://github.com/spring-projects/spring-data-examples/tree/master/jpa/eclipselink

Dropwizard spring data couchbase

I am building a project with Dropwizard, Couchbase and ElasticSearch.
I am looking for a persistence layer like an ODM for Dropwizard and CouchBase. I looked over and found Spring-data-couchbase. Can I integrate DropWizard with Spring-data-couchbase and just use Spring-data-couchbase just for persistence? If I just use Spring-data-couchbase will it create an IOC container?

if you are looking for an ODM layer, we recently added a light one to the Java SDK, see Entity Mapping: http://blog.couchbase.com/javasdk-2.2-dp
Also if you are looking to use Spring Data Couchbase, you should maybe look into Spring boot, that basically does the same things as DropWizard. But of course Spring Data Couchbase is more integrated with Spring Boot than DropWizard.
As for DropWizard and Spring, yes I guess you would drag some Spring dependency in there so it might create some stuff that already have an equivalent in Dropwizard. But I have no knowledge of Dropwizard so, not sure.