How to prevent spring boot from auto creating instance of bean 'entityManagerFactory' at startup?

Question

I am working on a Spring boot application that uses Spring JPA with PostgreSQL. I am using @SpringBootTest(classes = <my package>.Application.class) to initialize my unit test for a controller class.

The problem is that this is causing the entityManagerFactory bean (and many other objects related to jpa, datasource, jdbc, etc.) to be created which is not needed for unit tests. Is there a way to prevent Spring from automatically creating these objects till they are actually used the first time?

I spent a lot of time trying to load up only the beans I need for my unit test but ran into many errors. I am relatively new to Spring and I am hoping someone else has run into this before...and can help. I can post code snippets if needed.

Update: I am not sure if I should edit or answer my own question...choosing to edit since I ended up changing my approach to unit tests. I added this to my test config class.

  @Configuration
  @ComponentScan(basePackages = {"api.controller", "api.config", "api.utils"})
  public class TestControllerConfig {
  }

and I mocked out the service and repository classes.

Answer 1

You can disable auto configuration in spring-boot using exclude attribute of @EnableAutoConfiguration, as follows:

@Configuration
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class TestConfig {
}

From @EnableAutoConfiguration documentation:

If the class is not on the classpath, you can use the excludeName attribute of the annotation and specify the fully qualified name instead. Finally, you can also control the list of auto-configuration classes to exclude via the spring.autoconfigure.exclude property.