java - 我刚刚检索到的对象上的 Hibernate StaleObjectStateException

Question

在我的代码中，我通过 Hibernate 从数据库获取一个对象，更改一个字段并提交更改

    session = HibernateUtil.beginTransaction();
    Song song =SongCache.loadSongFromDatabase(session, songId);
    song.setLastModified(new Date(new File(song.getFilename()).lastModified() + 1));
    session.saveOrUpdate(song);
    session.getTransaction().commit();

歌曲类定义为，我也使用 Hibernate Envers 并且歌曲经过审核

/**
 * A Song (or sound recording)
 */
@Audited
@Entity
public class Song
{
    @Id
    @GeneratedValue
    private Integer recNo;

    @Version
    private int version;

    @Basic
    private String filename;

    /**
     * Last Modified Date
     */
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastModified;


    public Song(String file)
    {
        this.setFilename(file);
    }

    public Song()
    {

    }


    @Column(length = 1000)
    private String album;
  ......
}

但有时我会收到 StaleObjectStateException，我无法理解这是如何发生的

org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.jthink.songlayer.Song#1]
    at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2359)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3010)
    at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2908)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3237)
    at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:113)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:272)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:264)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:187)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
    at com.jthink.buzikmusik.analyse.analyser.SongSaver.saveSongToFile(SongSaver.java:286)
    at com.jthink.buzikmusik.analyse.analyser.SongSaver.saveChanges(SongSaver.java:75)
    at com.jthink.buzikmusik.analyse.analyser.SongSaver.call(SongSaver.java:70)
    at com.jthink.buzikmusik.analyse.analyser.SongSaver.call(SongSaver.java:45)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

Answer 1

我总是关闭 session ，但在finally() block 中，这可能是在我将同一首歌曲的任务提交给另一个执行服务之后发生的。因此，如果此任务在第一个任务中的 finally block() 之前启动，则可能会出现问题，这就是问题所在。