Spring Data MongoDB Transactions

MongoDB Configuration

@Configuration
@EnableMongoRepositories(basePackages = "com.baeldung.repository")
public class MongoConfig extends AbstractMongoClientConfiguration{

    @Bean
    MongoTransactionManager transactionManager(MongoDatabaseFactory dbFactory) {
        return new MongoTransactionManager(dbFactory);
    }

    @Override
    protected String getDatabaseName() {
        return "test";
    }

    @Override
    public MongoClient mongoClient() {
        final ConnectionString connectionString = new ConnectionString("mongodb://localhost:27017/test");
        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
            .applyConnectionString(connectionString)
            .build();
        return MongoClients.create(mongoClientSettings);
    }
}

Synchronous Transactions

@Test
@Transactional
public void whenPerformMongoTransaction_thenSuccess() {
    userRepository.save(new User("John", 30));
    userRepository.save(new User("Ringo", 35));
    Query query = new Query().addCriteria(Criteria.where("name").is("John"));
    List<User> users = mongoTemplate.find(query, User.class);

    assertThat(users.size(), is(1));
}

Note that we can’t use listCollections command inside a multi-document transaction – for example:

References
https://www.baeldung.com/spring-data-mongodb-transactions

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