Hibernate 在事务提交时不刷新实体更新答案

【问题标题】：Hibernate not flushing entity update on transaction commitHibernate 在事务提交时不刷新实体更新
【发布时间】：2020-09-18 18:27:16
【问题描述】：

这是事务服务，它定义了我用来创建 UserCommit 并显式持久化它的方法（这部分有效），同时更新已经存在的父实体 User 的 lastCommit 字段。此更新不会被刷新。

@Transactional
@Service
public class UserCommitService {

    @Autowired
    private UserService userService;
    @Autowired
    private UserCommitRepository ucRepo;

    public UserCommit createFrom(User user, Integer prodId, String ucType, String stage) {

        UserCommit uc = new UserCommit();
        uc.setUser(userService.findUserById(user.getId()));
        uc.getUser().addUserCommit(uc);
        uc.setTime(LocalDateTime.now());

        uc.getUser().setLastCommit(uc.getTime());

        ucRepo.save(uc);

        return uc;
    }

}

您可以在此处阅读跟踪日志：

从数据库中正确选择了用户
~~为 ucRepo.save 创建了一个内部事务（这是一个 CRUDRepo 方法，我认为这很正常）~~ userCommit 被正确插入到 DB 中

编辑

为什么CrudRepository.save 创建一个新事务而不是加入现有事务？

外部事务被恢复，但即使实体显示更新的字段，脏检查似乎也忽略了这一点，因为提交时没有记录插入。

2020-05-31 12:52:36.405 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@296e6024] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@1826475] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:52:36.406 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Found thread-bound EntityManager [SessionImpl(461939992<open>)] for JPA transaction
2020-05-31 12:52:36.406 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Creating new transaction with name [petmenu.services.users.UserCommitService.createFrom]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
2020-05-31 12:52:36.407 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Exposing JPA transaction as JDBC [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@5ac66b8d]
2020-05-31 12:52:36.407 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.jdbc.datasource.ConnectionHolder@4905e3e7] for key [HikariDataSource (HikariPool-1)] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:52:36.407 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Initializing transaction synchronization
2020-05-31 12:52:36.407 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Getting transaction for [petmenu.services.users.UserCommitService.createFrom]
2020-05-31 12:53:24.212 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@296e6024] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@1826475] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:53:24.217 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Found thread-bound EntityManager [SessionImpl(461939992<open>)] for JPA transaction
2020-05-31 12:53:24.221 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.jdbc.datasource.ConnectionHolder@4905e3e7] for key [HikariDataSource (HikariPool-1)] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:53:24.228 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Participating in existing transaction
2020-05-31 12:53:24.232 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Getting transaction for [petmenu.services.users.UserService.findUserById]
2020-05-31 12:53:24.256 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : No need to create transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.findUserById]: This method is not transactional.
2020-05-31 12:53:24.265 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.EntityManagerFactoryUtils    : Opening JPA EntityManager
2020-05-31 12:53:24.271 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:53:24.279 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:53:24.288 DEBUG 7194 --- [.10-8080-exec-6] org.hibernate.SQL                        : select user0_.id as id1_0_, user0_.kc_id as kc_id2_0_, user0_.last_commit as last_com3_0_, user0_.name as name4_0_ from user user0_ where user0_.id=?
2020-05-31 12:53:24.298 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [INTEGER] - [6]
2020-05-31 12:53:24.309 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([id1_0_] : [INTEGER]) - [6]
2020-05-31 12:53:24.317 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([kc_id2_0_] : [VARCHAR]) - [80a3b4b1-00d1-4062-a7e5-1927b938c203]
2020-05-31 12:53:24.325 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([last_com3_0_] : [TIMESTAMP]) - [null]
2020-05-31 12:53:24.332 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_] : [VARCHAR]) - [user1]
2020-05-31 12:53:24.342 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Completing transaction for [petmenu.services.users.UserService.findUserById]
2020-05-31 12:55:07.918 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$DefaultCrudMethodMetadata@326a9afb] for key [public abstract java.lang.Object org.springframework.data.repository.CrudRepository.save(java.lang.Object)] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:07.957 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:07.961 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Found thread-bound EntityManager [SessionImpl(1373582834<open>)] for JPA transaction
2020-05-31 12:55:07.966 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:07.970 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Clearing transaction synchronization
2020-05-31 12:55:07.975 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Creating new transaction with name [org.springframework.data.jpa.repository.support.SimpleJpaRepository.save]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
2020-05-31 12:55:07.980 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Opened new EntityManager [SessionImpl(756005269<open>)] for JPA transaction
2020-05-31 12:55:07.987 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Exposing JPA transaction as JDBC [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@6860e795]
2020-05-31 12:55:07.992 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.jdbc.datasource.ConnectionHolder@6374741f] for key [HikariDataSource (HikariPool-2)] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:07.998 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.orm.jpa.EntityManagerHolder@4b2cad26] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:08.002 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Initializing transaction synchronization
2020-05-31 12:55:08.006 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Getting transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.save]
2020-05-31 12:55:08.226 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@4b2cad26] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] bound to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:08.392 DEBUG 7194 --- [.10-8080-exec-6] org.hibernate.SQL                        : select nextval(hibernate_sequence)
2020-05-31 12:55:08.783 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Completing transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.save]
2020-05-31 12:55:08.787 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCommit synchronization
2020-05-31 12:55:08.791 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCompletion synchronization
2020-05-31 12:55:08.796 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Initiating transaction commit
2020-05-31 12:55:08.800 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Committing JPA transaction on EntityManager [SessionImpl(756005269<open>)]
2020-05-31 12:55:08.824 DEBUG 7194 --- [.10-8080-exec-6] org.hibernate.SQL                        : insert into user_commit (uctype, prod_id, stage, time, user, id) values (?, ?, ?, ?, ?, ?)
2020-05-31 12:55:08.832 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [INTEGER] - [1]
2020-05-31 12:55:08.838 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [2] as [INTEGER] - [3]
2020-05-31 12:55:08.845 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [3] as [INTEGER] - [0]
2020-05-31 12:55:08.884 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [4] as [TIMESTAMP] - [2020-05-31T12:54:58.518530]
2020-05-31 12:55:08.922 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [5] as [INTEGER] - [6]
2020-05-31 12:55:08.929 TRACE 7194 --- [.10-8080-exec-6] o.h.type.descriptor.sql.BasicBinder      : binding parameter [6] as [INTEGER] - [3003]
2020-05-31 12:55:09.043 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCommit synchronization
2020-05-31 12:55:09.048 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Clearing transaction synchronization
2020-05-31 12:55:09.052 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCompletion synchronization
2020-05-31 12:55:09.056 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.orm.jpa.EntityManagerHolder@4b2cad26] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:09.062 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.jdbc.datasource.ConnectionHolder@6374741f] for key [HikariDataSource (HikariPool-2)] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:09.066 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Closing JPA EntityManager [SessionImpl(756005269<open>)] after transaction
2020-05-31 12:55:09.070 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Resuming suspended transaction after completion of inner transaction
2020-05-31 12:55:09.075 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Initializing transaction synchronization
2020-05-31 12:55:09.080 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] to thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:55:09.085 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$DefaultCrudMethodMetadata@326a9afb] for key [public abstract java.lang.Object org.springframework.data.repository.CrudRepository.save(java.lang.Object)] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:58:18.989 TRACE 7194 --- [.10-8080-exec-6] o.s.t.i.TransactionInterceptor           : Completing transaction for [petmenu.services.users.UserCommitService.createFrom]
2020-05-31 12:58:18.997 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCommit synchronization
2020-05-31 12:58:19.001 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCompletion synchronization
2020-05-31 12:58:19.006 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.orm.jpa.EntityManagerHolder@75c27c80] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@6c8672b9] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:58:19.071  INFO 7194 --- [.10-8080-exec-6] o.h.c.i.AbstractPersistentCollection     : HHH000496: Detaching an uninitialized collection with queued operations from a session: [petmenu.entities.users.User.userCommitList#6]
2020-05-31 12:58:19.075 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Initiating transaction commit
2020-05-31 12:58:19.081 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Committing JPA transaction on EntityManager [SessionImpl(461939992<open>)]
2020-05-31 12:58:19.095 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCommit synchronization
2020-05-31 12:58:19.099 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Clearing transaction synchronization
2020-05-31 12:58:19.104 TRACE 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCompletion synchronization
2020-05-31 12:58:19.109 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.jdbc.datasource.ConnectionHolder@4905e3e7] for key [HikariDataSource (HikariPool-1)] from thread [http-nio-192.168.1.10-8080-exec-6]
2020-05-31 12:58:19.113 DEBUG 7194 --- [.10-8080-exec-6] o.s.orm.jpa.JpaTransactionManager        : Not closing pre-bound JPA EntityManager after transaction
2020-05-31 12:59:07.063 TRACE 7194 --- [.10-8080-exec-6] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.orm.jpa.EntityManagerHolder@296e6024] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@1826475] from thread [http-nio-192.168.1.10-8080-exec-6]

EDIT2

我试图删除 CrudRepository.save 调用，因为它的行为很奇怪，它自己创建了一个新事务，并且似乎对前一个关闭负责。日志变得更加逻辑，但 User.lastCommit 新值仍然没有被刷新。

2020-06-01 11:39:10.518 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@5f0cca8f] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@27bbe773] bound to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:10.518 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Found thread-bound EntityManager [SessionImpl(2096513672<open>)] for JPA transaction
2020-06-01 11:39:10.518 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Creating new transaction with name [petmenu.services.users.UserCommitService.createFrom]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
2020-06-01 11:39:10.518 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Exposing JPA transaction as JDBC [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@62cbdd03]
2020-06-01 11:39:10.519 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.jdbc.datasource.ConnectionHolder@4b988820] for key [HikariDataSource (HikariPool-1)] to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:10.519 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Initializing transaction synchronization
2020-06-01 11:39:10.519 TRACE 26420 --- [.10-8080-exec-2] o.s.t.i.TransactionInterceptor           : Getting transaction for [petmenu.services.users.UserCommitService.createFrom]
2020-06-01 11:39:16.678 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@5f0cca8f] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@27bbe773] bound to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:16.683 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Found thread-bound EntityManager [SessionImpl(2096513672<open>)] for JPA transaction
2020-06-01 11:39:16.688 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.jdbc.datasource.ConnectionHolder@4b988820] for key [HikariDataSource (HikariPool-1)] bound to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:16.693 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Participating in existing transaction
2020-06-01 11:39:16.697 TRACE 26420 --- [.10-8080-exec-2] o.s.t.i.TransactionInterceptor           : Getting transaction for [petmenu.services.users.UserService.findUserById]
2020-06-01 11:39:16.720 TRACE 26420 --- [.10-8080-exec-2] o.s.t.i.TransactionInterceptor           : No need to create transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.findUserById]: This method is not transactional.
2020-06-01 11:39:16.727 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.EntityManagerFactoryUtils    : Opening JPA EntityManager
2020-06-01 11:39:16.733 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Bound value [org.springframework.orm.jpa.EntityManagerHolder@ca14c2f] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@161c9468] to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:16.738 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Retrieved value [org.springframework.orm.jpa.EntityManagerHolder@ca14c2f] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@161c9468] bound to thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:16.747 DEBUG 26420 --- [.10-8080-exec-2] org.hibernate.SQL                        : select user0_.id as id1_0_, user0_.kc_id as kc_id2_0_, user0_.last_commit as last_com3_0_, user0_.name as name4_0_ from user user0_ where user0_.id=?
2020-06-01 11:39:16.754 TRACE 26420 --- [.10-8080-exec-2] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [INTEGER] - [6]
2020-06-01 11:39:16.763 TRACE 26420 --- [.10-8080-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([id1_0_] : [INTEGER]) - [6]
2020-06-01 11:39:16.772 TRACE 26420 --- [.10-8080-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([kc_id2_0_] : [VARCHAR]) - [80a3b4b1-00d1-4062-a7e5-1927b938c203]
2020-06-01 11:39:16.779 TRACE 26420 --- [.10-8080-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([last_com3_0_] : [TIMESTAMP]) - [null]
2020-06-01 11:39:16.787 TRACE 26420 --- [.10-8080-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_] : [VARCHAR]) - [user1]
2020-06-01 11:39:16.795 TRACE 26420 --- [.10-8080-exec-2] o.s.t.i.TransactionInterceptor           : Completing transaction for [petmenu.services.users.UserService.findUserById]
2020-06-01 11:39:48.779 TRACE 26420 --- [.10-8080-exec-2] o.s.t.i.TransactionInterceptor           : Completing transaction for [petmenu.services.users.UserCommitService.createFrom]
2020-06-01 11:39:48.780 TRACE 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCommit synchronization
2020-06-01 11:39:48.780 TRACE 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Triggering beforeCompletion synchronization
2020-06-01 11:39:48.780 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.orm.jpa.EntityManagerHolder@ca14c2f] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@161c9468] from thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:48.782  INFO 26420 --- [.10-8080-exec-2] o.h.c.i.AbstractPersistentCollection     : HHH000496: Detaching an uninitialized collection with queued operations from a session: [petmenu.entities.users.User.userCommitList#6]
2020-06-01 11:39:48.782 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Initiating transaction commit
2020-06-01 11:39:48.782 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Committing JPA transaction on EntityManager [SessionImpl(2096513672<open>)]
2020-06-01 11:39:48.787 TRACE 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCommit synchronization
2020-06-01 11:39:48.787 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Clearing transaction synchronization
2020-06-01 11:39:48.787 TRACE 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Triggering afterCompletion synchronization
2020-06-01 11:39:48.787 TRACE 26420 --- [.10-8080-exec-2] .s.t.s.TransactionSynchronizationManager : Removed value [org.springframework.jdbc.datasource.ConnectionHolder@4b988820] for key [HikariDataSource (HikariPool-1)] from thread [http-nio-192.168.1.10-8080-exec-2]
2020-06-01 11:39:48.787 DEBUG 26420 --- [.10-8080-exec-2] o.s.orm.jpa.JpaTransactionManager        : Not closing pre-bound JPA EntityManager after transaction

【问题讨论】：

返回方法响应或对它的引用不会改变任何东西。不需要使用 saveAndFlush，因为 Transaction 应该负责在提交时刷新持久化实体。
以防万一；你确定lastCommit 字段是数据库的updatable 字段。我的意思是它有一个 @Column 关联，它不是 insertable=false, updatable=false,
@feanor07 我得到了很多没有注释的字段，而且它们工作正常。此外，lastCommit 相关列在 DB 内部创建，但其值保持为 NULL。
只是一个愚蠢的问题；如果您只是去更新用户的lastCommit 字段并且不做任何关于通过存储库保存UserCommit 的操作；这行得通吗？发生什么了？看到为存储库保存创建了一个新事务，我感到非常惊讶；这很奇怪！
@feanor07 这也让我感到惊讶。不幸的是，无论如何都没有刷新更新。但是查看 EDIT2 以查看日志。

标签： spring-boot hibernate jpa spring-data-jpa spring-transactions

【解决方案1】：

我只花了 4 天时间就意识到问题所在。太棒了...（说实话，我充分利用了我必须阅读的所有关于 JPA 和 Hibernate 的内容来完全摆脱 OSIV）。

当我定义我的两个数据源（Products 和 Users）配置时，我将 ProductsDataSourceConfiguration 中的所有类注释为 @Primary，使它们成为默认值在没有明确设置名称的情况下调用。
问题在于其中的 PlatformTransactionManager，它被称为我的两个数据源的事务管理器，而实际上是为产品之一设计的。
为了解决这个问题，我必须在引用 secondary (Users) 数据源的方法上使用的 @Transactional 注释上指定 secondary 事务管理器名称：

@Transactional("usersTransactionManager")
@Service
public class UserCommitService {
...

【讨论】：