Master Programmatic Transactions in Spring Boot 2.3.9 with Templates & Managers

Environment

Spring Boot 2.3.9.RELEASE

Programmatic Transaction Management Options

Use

TransactionTemplate

or

TransactionalOperator

Directly create a

TransactionManager

implementation

Spring officially recommends the

TransactionTemplate

approach.

Preparation

<code>@Entity
@Table(name = "BC_USERS")
@Data
public class Users {
    private String username;
    private String password;
    private Integer status = 0;
}

public interface UsersRepository extends JpaRepository<Users, String> {
    @Modifying
    @Query("update Users u set u.status=?1,u.password='123123' where u.id=?2")
    int updateUsers(Integer status, String id);
}

@Mapper
public interface UsersMapper {
    int insertUser(Users user);
}

<!-- Mapper.xml -->
<insert id="insertUser" parameterType="com.pack.domain.Users">
    insert into bc_users (id, username, password) values (#{id}, #{username}, #{password})
</insert>
</code>

1. TransactionTemplate

1.1 With Return Value

<code>@Service
public class UserService {
    @Resource
    private TransactionTemplate transactionTemplate;
    @Resource
    private UsersRepository usersRepository;

    public Integer saveUsers(Users users) {
        transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);
        Integer result = transactionTemplate.execute(new TransactionCallback<Integer>() {
            @Override
            public Integer doInTransaction(TransactionStatus status) {
                return usersMapper.insertUser(users);
            }
        });
        return result;
    }
}
</code>

1.2 Without Return Value

<code>public void saveUsers(Users users) {
    transactionTemplate.execute(new TransactionCallbackWithoutResult() {
        @Override
        protected void doInTransactionWithoutResult(TransactionStatus status) {
            usersMapper.insertUser(users);
        }
    });
}
</code>

1.3 Transaction Rollback

<code>public Users saveUser(Users users) {
    return transactionTemplate.execute(new TransactionCallback<Users>() {
        @Override
        public Users doInTransaction(TransactionStatus status) {
            try {
                return usersMapper.insertUser(users);
            } catch (Exception e) {
                status.setRollbackOnly();
            }
            return null;
        }
    });
}
</code>

1.4 Configuring Transaction Attributes

<code>private TransactionTemplate transactionTemplate;

public UserService(PlatformTransactionManager transactionManager) {
    this.transactionTemplate = new TransactionTemplate(transactionManager);
    this.transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED);
    this.transactionTemplate.setTimeout(30); // seconds
}
</code>

Test Code (Demonstrating NOT_SUPPORTED error)

<code>public Integer updateUsers(Integer statusValue, String id) {
    return transactionTemplate.execute(new TransactionCallback<Integer>() {
        @Override
        public Integer doInTransaction(TransactionStatus status) {
            return usersRepository.updateUsers(statusValue, id);
        }
    });
}

@Modifying
@Query("update Users u set u.status=?1 where u.id=?2")
int updateUsers(Integer status, String id);
</code>

<code>org.springframework.dao.InvalidDataAccessApiUsageException: Executing an update/delete query; nested exception is javax.persistence.TransactionRequiredException: Executing an update/delete query
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:403)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:257)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:531)
</code>

2. TransactionalOperator

Applicable to reactive programming; not covered here.

3. TransactionManager

Two main types:

PlatformTransactionManager

and

ReactiveTransactionManager

(reactive not covered).

3.1 PlatformTransactionManager Example

<code>private PlatformTransactionManager transactionManager;
private DefaultTransactionDefinition definition;
private TransactionStatus status;
@Resource
private UsersRepository usersRepository;

public UserService3(PlatformTransactionManager transactionManager) {
    this.transactionManager = transactionManager;
    definition = new DefaultTransactionDefinition();
    definition.setName("pgName");
    definition.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
}

public Integer saveUsers(Users users) {
    TransactionStatus status = this.transactionManager.getTransaction(definition);
    Integer result = null;
    try {
        result = usersMapper.insertUser(users);
    } catch (Exception e) {
        transactionManager.rollback(status);
        throw e;
    }
    transactionManager.commit(status);
    publisher.publishEvent(new UsersEvent(users));
    return result;
}
</code>

4. Transaction Event Listening

Use

@TransactionalEventListener

to listen to transaction phases (AFTER_COMMIT, AFTER_COMPLETION, AFTER_ROLLBACK, BEFORE_COMMIT). It works only with declarative transactions managed by

PlatformTransactionManager

.

<code>public @interface TransactionalEventListener {
    TransactionPhase phase() default TransactionPhase.AFTER_COMMIT;
    boolean fallbackExecution() default false;
    @AliasFor(annotation = EventListener.class, attribute = "classes")
    Class<?>[] value() default {};
    @AliasFor(annotation = EventListener.class, attribute = "classes")
    Class<?>[] classes() default {};
    String condition() default "";
}
</code>

<code>public enum TransactionPhase {
    BEFORE_COMMIT, // before commit
    AFTER_COMMIT,  // after commit
    AFTER_ROLLBACK, // after rollback
    AFTER_COMPLETION // after completion
}
</code>

<code>// Listener component
@Component
public class TxListenerComponent {
    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT)
    public void handleUsersAfterCommit(UsersEvent usersEvent) {
        Users user = (Users) usersEvent.getSource();
        System.out.println("AfterCommit received event: " + user.getPassword());
    }
    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMPLETION)
    public void handleUsersAfterCompletion(UsersEvent usersEvent) {
        Users user = (Users) usersEvent.getSource();
        System.out.println("AfterCompletion received event: " + user.getPassword());
    }
    @TransactionalEventListener(phase = TransactionPhase.AFTER_ROLLBACK)
    public void handleUsersAfterRollback(UsersEvent usersEvent) {
        Users user = (Users) usersEvent.getSource();
        System.out.println("AfterRollback received event: " + user.getPassword());
    }
    @TransactionalEventListener(phase = TransactionPhase.BEFORE_COMMIT)
    public void handleUsersBeforeCommit(UsersEvent usersEvent) {
        Users user = (Users) usersEvent.getSource();
        System.out.println("BeforeCommit received event: " + user.getPassword());
    }
}

// Publishing event
@Resource
private ApplicationEventPublisher publisher;
@Resource
private UsersMapper usersMapper;

public Integer saveUsers(Users users) {
    Integer result = transactionTemplate.execute(new TransactionCallback<Integer>() {
        @Override
        public Integer doInTransaction(TransactionStatus status) {
            return usersMapper.insertUser(users);
        }
    });
    publisher.publishEvent(new UsersEvent(users));
    return result;
}
</code>

Run Result

<code>2021-06-17 14:02:56.830 DEBUG 10000 --- [nio-8081-exec-1] com.pack.mapper.UsersMapper.insertUser   : ==>  Preparing: insert into bc_users (id, username, password) values (?, ?, ?)
2021-06-17 14:02:56.840 DEBUG 10000 --- [nio-8081-exec-1] com.pack.mapper.UsersMapper.insertUser   : ==>  Parameters: mmmmm(String), mmmmm(String), mmmmm(String)
2021-06-17 14:02:56.842 DEBUG 10000 --- [nio-8081-exec-1] com.pack.mapper.UsersMapper.insertUser   : <==    Updates: 1
BeforeCommit收到事件通知：mmmmm
AfterCommit收到事件通知：mmmmm
AfterCompletion收到事件通知：mmmmm
</code>

Summary : Programmatic transaction management is suitable for a small number of transactional operations, such as when most of the service logic is non‑transactional computation followed by a single commit. For many transactional steps, declarative (annotation‑based) transactions are generally more appropriate.