This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Data JPA 3.3.5!

Usage

You can now use the methods from RevisionRepository to query the revisions of the entity, as the following test case shows:

@ExtendWith(SpringExtension.class)
@Import(EnversDemoConfiguration.class) (1)
class EnversIntegrationTests {

	final PersonRepository repository;
	final TransactionTemplate tx;

	EnversIntegrationTests(@Autowired PersonRepository repository, @Autowired PlatformTransactionManager tm) {
		this.repository = repository;
		this.tx = new TransactionTemplate(tm);
	}

	@Test
	void testRepository() {

		Person updated = preparePersonHistory();

		Revisions<Long, Person> revisions = repository.findRevisions(updated.id);

		Iterator<Revision<Long, Person>> revisionIterator = revisions.iterator();

		checkNextRevision(revisionIterator, "John", RevisionType.INSERT);
		checkNextRevision(revisionIterator, "Jonny", RevisionType.UPDATE);
		checkNextRevision(revisionIterator, null, RevisionType.DELETE);
		assertThat(revisionIterator.hasNext()).isFalse();

	}

	/**
    * Checks that the next element in the iterator is a Revision entry referencing a Person
    * with the given name after whatever change brought that Revision into existence.
    * <p>
    * As a side effect the Iterator gets advanced by one element.
    *
    * @param revisionIterator the iterator to be tested.
    * @param name the expected name of the Person referenced by the Revision.
    * @param revisionType the type of the revision denoting if it represents an insert, update or delete.
    */
	private void checkNextRevision(Iterator<Revision<Long, Person>> revisionIterator, String name,
			RevisionType revisionType) {

		assertThat(revisionIterator.hasNext()).isTrue();
		Revision<Long, Person> revision = revisionIterator.next();
		assertThat(revision.getEntity().name).isEqualTo(name);
		assertThat(revision.getMetadata().getRevisionType()).isEqualTo(revisionType);
	}

	/**
    * Creates a Person with a couple of changes so it has a non-trivial revision history.
    * @return the created Person.
    */
	private Person preparePersonHistory() {

		Person john = new Person();
		john.setName("John");

		// create
		Person saved = tx.execute(__ -> repository.save(john));
		assertThat(saved).isNotNull();

		saved.setName("Jonny");

		// update
		Person updated = tx.execute(__ -> repository.save(saved));
		assertThat(updated).isNotNull();

		// delete
		tx.executeWithoutResult(__ -> repository.delete(updated));
		return updated;
	}
}
1 This references the application context configuration presented earlier (in the Configuration section).

Further Resources

You can download the Spring Data Envers example in the Spring Data Examples repository and play around with to get a feel for how the library works.

You should also check out the Javadoc for RevisionRepository and related classes.