Spring的事务传播机制，以Propagation.REQUIRED为例 参考文章：https://www.ibm.com/developerworks/cn/education/opensource/os-cn-spring-trans/index.html

Committer.java

@Configuration
@EnableTransactionManagement
@Component
public class Committer {
	// define data source
	private final DataSource ds = DataSourceBuilder
			.create()
			.username("root")
			.password("123456")
			.url("jdbc:mysql://localhost:3306/test")
			.driverClassName("com.mysql.jdbc.Driver")
			.build();

	@Bean
	@Primary
	public PlatformTransactionManager txMgr() {
		return new DataSourceTransactionManager(ds);
	}

	// get mybatis mapper
	private UserMapper getUserMapper() {
		try {
			SqlSessionTemplate template = sqlSessionTemplate(loadSqlSessionFactory(ds));
			return template.getMapper(UserMapper.class);
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}
	}

	// outer transaction
	@Transactional(propagation = Propagation.REQUIRED)
	public void outerTx() {
		String aUser = "user_required";
		insertUser(aUser);
		try {
			innerTx(aUser);
		}
		catch (RuntimeException ex) {
			ex.printStackTrace();
		}
	}

	// inner transaction
	@Transactional(propagation = Propagation.REQUIRED)
	public void innerTx(String username) {
		getUserMapper().createLog("creating user:" + username);

		throw new RuntimeException("mock exception");
	}

	private void insertUser(String username) {
		getUserMapper().insert(new User(username));
	}
}  

Test.java

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = Committer.class)
public class TestConfigTest {
	@Autowired
	private Committer committer;

	@Test
	public void testPropagateRequired() {
		committer.outerTx();
	}
}

参考文章：https://www.ibm.com/developerworks/cn/education/opensource/os-cn-spring-trans/index.html