Spring Data Neo4j InvalidDataAccessApiUsageException：该线程的事务不是当前的

Question

我有一个 Spring boot neo4j 应用程序，想将用户存储在 Neo4j 数据库中。我按照here 的说明进行操作。 neo4j的配置是这样的：

@Configuration
@EnableWebMvc
@ComponentScan({"eu.bm"})
@EnableNeo4jRepositories("eu.bm.repository")
@EnableTransactionManagement
public class bmConfiguration extends WebMvcConfigurerAdapter {

@Bean
public OpenSessionInViewInterceptor openSessionInViewInterceptor() {
    OpenSessionInViewInterceptor openSessionInViewInterceptor =
            new OpenSessionInViewInterceptor();
    openSessionInViewInterceptor.setSessionFactory(sessionFactory());
    return openSessionInViewInterceptor;
}

public void addInterceptors(InterceptorRegistry registry) {
    registry.addWebRequestInterceptor(openSessionInViewInterceptor());
}

@Bean
public static SessionFactory sessionFactory() {
    return new SessionFactory("eu.bm.domain");
}

@Bean
public Neo4jTransactionManager transactionManager() throws Exception {
    return new Neo4jTransactionManager(sessionFactory());
}

用户存储库是这样的：

@Repository
public interface UserRepository extends GraphRepository<User>{

@Query("MATCH (user:User) where user.name={0} return user ")
User findUser(String username);

@Query("MATCH (user:User) where user.name={0} delete user ")
User deleteUser(String username);

@Query("match (user:User) delete user")
User deleteAllUsers();

}

我也有这个用户管理服务设置：

@Component
public interface UserManagementService {

List<User> listAll();

User save(User user);

User findUser(String username);
}

在这里实现：

@Service
@Transactional
public class UserManagementServiceImpl implements UserManagementService {

private UserRepository userRepository;

@Autowired
public UserManagementServiceImpl(UserRepository userRepository) {this.userRepository = userRepository;}

@Override
public List<User> listAll() {
    List<User> users = new ArrayList<>();
    userRepository.findAll().forEach(users::add);
    return users;
}

@Override
public User save(User user) {
    userRepository.save(user);
    return user;
}

@Override
public User findUser(String username) {
    return userRepository.findUser(username);
}

然后我执行如下简单的读写测试：

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class DatabaseConnectionTest {

// User 1
private static final String UNAME1 = "Paul";
private static final String EMAIL1 = "paul@user.com";
private static final String PASSWORD1 = "p@ss";
private static final String USERNAME1 = "paul";

@Autowired
private UserRepository userRepository;

@Before
public void setUp() throws Exception {

    // Clear database before adding new user
    userRepository.deleteAllUsers();

    // Creating user
    User user = new User(UNAME1, USERNAME1, PASSWORD1, EMAIL1);
    userRepository.save(user);
}

@Test
public void testPersistence() {

    Assert.assertEquals(UNAME1, userRepository.findUser(UNAME1).getName());
    Assert.assertEquals(USERNAME1, userRepository.findUser(UNAME1).getUsername());

}

上面的结果就是这个错误：

2017-08-16 14:59:38.990 INFO 6496 --- [main] e.b.repository.DatabaseConnectionTest：在 7.131 秒内启动 DatabaseConnectionTest（JVM 运行 8.331） 2017-08-16 14:59:39.872 INFO 6496 --- [main] o.n.o.drivers.http.request.HttpRequest：线程：1，url：http://localhost:7474/db/data/transaction/39，请求：{“statements”：[{“statement”： "UNWIND {rows} as row CREATE (n:User) SET n=row.props RETURN row.nodeRef as ref, ID(n) as id, row.type as type","parameters":{"rows" :[{"nodeRef":-1821370276,"type":"node","props":{"password":"p@ss","name":"Paul","email":"paul@user. com","username":"paul"}}]},"resultDataContents":["row"],"includeStats":false}]} 2017-08-16 14:59:40.358 错误 6496 --- [main] o.s.d.n.t.Neo4jTransactionManager：提交异常被回滚异常覆盖

org.springframework.dao.InvalidDataAccessApiUsageException：该线程的事务不是当前的；嵌套异常是 org.neo4j.ogm.exception.TransactionManagerException: Transaction is not current for this thread

• 为什么userRepository.save(user)在数据库中创建记录却抛出异常？
• “此线程的事务不是当前的”究竟是什么意思？
• 为什么 userRepository.save(user) 最终会失败，但 userRepository.deleteAllUsers() 有效？

编辑：我的 dependencies.gradle 包括以下内容：

compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-neo4j', version: '1.5.6.RELEASE'
//compile group: 'org.springframework.data', name: 'spring-data-neo4j', version: '4.2.6.RELEASE'
compile group: 'org.neo4j', name: 'neo4j-ogm-core', version: '2.1.3'
//compile group: 'org.neo4j', name: 'neo4j-ogm-bolt-driver', version: '2.1.3'
runtime group: 'org.neo4j', name: 'neo4j-ogm-http-driver', version: '2.1.3'
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.boot:spring-boot-starter-thymeleaf')
compile('org.springframework.boot:spring-boot-starter-web')
compile group: 'org.springframework.boot', name: 'spring-boot-starter-actuator', version: '1.5.4.RELEASE'
testCompile('org.springframework.boot:spring-boot-starter-test')

Answer 1

您的 SessionFactory bean 不应声明为 static：

@Bean
public static SessionFactory sessionFactory() {
    return new SessionFactory("eu.bm.domain");
}

应该是

@Bean
public SessionFactory sessionFactory() {
    return new SessionFactory("eu.bm.domain");
}

背景

"Transaction is not current for this thread" 意味着有东西试图提交一个与线程本地上下文中的当前 tx 不同的事务。

您正在使用默认事务管理 - 它围绕存储库调用创建事务。

当 SessionFactory bean 被定义为静态时，Session 不知何故在线程本地（由默认 tx 管理启动的）中看不到事务并创建新的，尝试提交它并出现异常。