Spring Boot DataJpaTest fail with java.lang.IllegalStateException:Caused by: Given type must be an interface

Question

To be precise depends on what error I have.

If I go with Intellij Maven Install, I get this exception (which is strange because I have this dependency and it should

Answer 1

You don't need @EnableAutoConfiguration for your @DataJpaTest, as the annotation is enabling every required part for testing this slice of the application:

// ... and some more
@BootstrapWith(DataJpaTestContextBootstrapper.class)
@ExtendWith(SpringExtension.class)
@OverrideAutoConfiguration(enabled = false)
@TypeExcludeFilters(DataJpaTypeExcludeFilter.class)
@Transactional
@AutoConfigureCache
@AutoConfigureDataJpa
@AutoConfigureTestDatabase
@AutoConfigureTestEntityManager
@ImportAutoConfiguration
public @interface DataJpaTest {

}

It's important to mention that with @DataJpaTest Spring will use an embedded in-memory database by default:

 * By default, tests annotated with {@code @DataJpaTest} are transactional and roll back
 * at the end of each test. They also use an embedded in-memory database (replacing any
 * explicit or usually auto-configured DataSource). The
 * {@link AutoConfigureTestDatabase @AutoConfigureTestDatabase} annotation can be used to
 * override these settings.

That's why you see the H2 database output and not Oracle. By default, Spring should use spring.jpa.hibernate.ddl-auto=create-drop to take care that your tables are present.

As you hardcode the schema inside your JPA entity with @Table(name = "MY_TABLE", schema = "MYSCHEMA", catalog = "") you have to ensure that the embedded H2 also uses this schema.

First try to remove schema from the @Table annotation and see if it works. Then you can globally configure your schema inside your application.properties and use @TestPropertySource(properties = "spring.jpa.properties.hibernate.default_schema=PETRA") for your test.

The following StackOverflow question might also help.