Hibernate generated fields not populated in tests annotated with @DataJpaTest

[GoGoris]

Using Spring Boot 2.0.0.RELEASE and Junit 5.1.0.

The annotationprocessor for @GeneratorType annotations does not seem to get loaded in tests annotated with @DataJpaTest.

I have a jpa object with a custom Hibernate ValueGenerator that generates a custom project code.
This test fails when it is ran with the @DataJpaTest annotation because the field is not generated at insertion.

My Jpa object has the following field:

@Entity
public class Project {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private Long id;

    @GeneratorType(type = NummerGenerator.class, when = GenerationTime.INSERT)
    @Column(name = "CODE")
    private String code;

}

This is my testcase, it fails on the last assertion. So the id is generated correctly but the project code is not.
The test passes if I replace @DataJpaTest with @SpringBootTest @AutoConfigureTestDatabase.

@ExtendWith(SpringExtension.class)
@DataJpaTest
public class ProjectRepositoryTest {
        @Autowired
	private ProjectRepository repository;

	@Test
	public void saveTest() {
		Project project = Project.builder().naam("test").build();
		project = repository.save(project);

		assertThat(project).isNotNull();
		assertThat(project.getId()).as("id").isGreaterThan(0L);
		assertThat(project.getCode()).as("Code after insertion").isEqualTo("PREFIX123");
	}
}

[snicoll]

@GoGoris I fail to see what @SpringBootTest would bring that @DataJpaTest doesn't. As far as I know the handling of GeneratorType is 100% in the hands of Hibernate.

Rather than pasting code that gives us an idea of what the problem might be, could you please share a project that we can run ourselves?

[GoGoris]

Here you go: https://github.com/GoGoris/hibernate-generatortype-datajpatest

I created 2 tests:

• ProjectRepositoryTest uses @DataJpaTest and fails
• SpringBootProjectRepositoryTest uses @SpringBootTest @AutoConfigureTestDatabase and succeeds.

[GoGoris]

I have found the issue by coincidence: Apparantly the value is not generated untill the data is flushed.
The springboottest also fails if I put @Transactional on the testcase. The test passes if I save the data with respository.saveAndFlush().

This means that this is not spring-boot related, as such this issue can be closed.

[snicoll]

@DataJpaTest tests are transactional by default.