spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true

@Service
public class MyService {

    @Resource
    private MyRepository repository;

    @PostConstruct
    public void init() {
        repository.save(new MyEntity(/* some data here */));

        // DEBUGGER here! At this point localhost:8082 hasn't got any of my tables

        repository.findAll(); // Not empty! It returns me my entites
    }
}