javax.persistence.RollbackException：提交事务时出错（没有 Spring 的 JPA）

Question

为数据库开发客户端-服务器应用程序。 addNewRestTrip 存在问题，尽管我尽可能地使其与 addNewCargoTrip 相似。 但我仍然得到一个 RollbackException。 顺便说一句，我使用 java 没有 Spring 框架，但我使用 JPA 堆栈跟踪

javax.persistence.RollbackException: Error while committing the transaction
at org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:81)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
at repository.RepositoryPostgres.addNewRestTrip(RepositoryPostgres.java:141)
at service.Service.addNewRestTrip(Service.java:61)
at api.Controller.addNewRestTrip(Controller.java:55)
at infrastructure.ui.tourist.PlanRestTrip.lambda$new$1(PlanRestTrip.java:90)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6397)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:65)
... 40 more
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:109)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:200)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3235)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3760)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:107)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
at org.hibernate.engine.spi.ActionQueue.lambda$executeActions$1(ActionQueue.java:478)
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:475)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:348)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:40)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:102)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1352)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:443)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3202)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2370)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:447)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:40)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101)
... 39 more
Caused by: org.postgresql.util.PSQLException: ОШИБКА: повторяющееся значение ключа нарушает ограничение уникальности "excursion_pk"
Подробности: Ключ "(id)=(1)" уже существует.
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2510)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2245)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:311)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:447)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:368)
at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:159)
at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:125)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197)
... 58 more

addNewRestTrip（不工作）

public void addNewRestTrip(Long id, String country, Timestamp dateIn, Timestamp dateOut, List<Excursion> joinedExcursions) {
    EntityManager entityManager = emf.createEntityManager();
    try {
        entityManager.getTransaction().begin();
        Tourist tourist = entityManager.find(Tourist.class, id);
        Trip trip = new Trip();
        trip.setCountry(country);
        trip.setDate_in(dateIn);
        trip.setDate_out(dateOut);
        trip.setTourist(tourist);
        trip.setRoom(null);
        trip.setExcursions(new ArrayList<>());
        trip.getExcursions().addAll(joinedExcursions);
        entityManager.persist(trip);
        joinedExcursions.forEach(c -> c.getParticipatingTourists().add(trip));
        entityManager.getTransaction().commit();
        entityManager.close();
    }
    catch (Exception e){
     entityManager.getTransaction().rollback();
     e.printStackTrace();
    }
}

addNewCargoTrip （相同，但有效）

public void addNewCargoTrip(Long id, String statement, String country, Timestamp dateIn, Timestamp dateOut) {
    EntityManager entityManager = emf.createEntityManager();
    List<Cargo> cargo = entityManager
            .createQuery("select c from Cargo c where c.statement.id = :statement", Cargo.class)
            .setParameter("statement", Integer.parseInt(statement))
            .getResultList();
    entityManager.getTransaction().begin();
    Tourist tourist = entityManager.find(Tourist.class, id);
    Trip trip = new Trip();
    trip.setCountry(country);
    trip.setDate_in(dateIn);
    trip.setDate_out(dateOut);
    trip.setTourist(tourist);
    trip.setRoom(null);
    trip.setCargos(new ArrayList<>());
    trip.getCargos().addAll(cargo);
    entityManager.persist(trip);
    cargo.forEach(c -> c.setOwnerTrip(trip));
    entityManager.getTransaction().commit();
    entityManager.close();
}

您可以在github上看到的项目（这很可怕）

Answer 1

您遇到的问题是您手动为您的 Excursions 提供了一个 ID。 当该 id 已存在于数据库中时，您将无法插入它。

有两种方法可以 go 关于这一点：

• 第一种方法是检查excursions表中哪个是最新的 id，并为您的实体提供更高的 id。
• 第二种方式（我的首选方式）是让数据库处理 id。 您可能已经为每个数字表 id 设置了一个序列。 如果不这样做，您应该将它们的类型更改为自动递增类型（例如，用于 Postgresql 的 SERIAL/BIGSERIAL）。 之后，只需在您的实体上的@Id注释之后添加@GeneratedValue(strategy = GenerationType.IDENTITY) ，并且在插入实体时不要为实体提供 ID（它将自动生成）。

重要提示：由于您已经在数据库中插入了条目，您可能需要将 id 序列的起始值设置为等于最后一行的 id + 1。