我已经坚持了好几个星期，而且我没有最模糊的想法出了什么问题。我已经很浪费了，因为我已经浪费了很多时间

我使用下面描述的数据模型（MySQL）。我已经通过反向工程（Eclipse / JBoss
Tools）创建了hbm.xml和java类（请参见下面的示例）。

当我尝试保存推文，单词或事件时，我可以在日志消息中看到生成了pk值并且正确绑定了参数，但是没有任何内容写入数据库。（请参阅帖子结尾处的日志消息）

但是最奇怪的是，我保存到event_has_words表中的对象已完美存储（带有单词和事件表中生成的ID）！最重要的是不会抛出异常！

有任何想法吗？我要疯了！

最好的祝福，

约翰

这是一个无效的映射：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="de.brotkasting.buki.cep.data.hibernate.entities.Event" table="event" catalog="cep1">
        <id name="pkEventsId" type="java.lang.Integer">
            <column name="PK_Events_Id" />
            <generator class="identity" />
        </id>
        <many-to-one name="sourceSystems" class="de.brotkasting.buki.cep.data.hibernate.entities.SourceSystems" fetch="select">
            <column name="SourceSystems_PK_SourceSystems_Id" not-null="true" />
        </many-to-one>
        <many-to-one name="tweets" class="de.brotkasting.buki.cep.data.hibernate.entities.Tweets" fetch="select">
            <column name="Tweets_pk_tweet_id" not-null="true" />
        </many-to-one>
        <property name="systemTimeStamp" type="timestamp">
            <column name="System_Time_Stamp" length="19" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

和相应的类：

    package de.brotkasting.buki.cep.data.hibernate.entities;

 // Generated 28.04.2009 21:24:54 by Hibernate Tools 3.2.4.GA

 @Entity
 @Table(name = "event", catalog = "cep1")
 public class Event implements java.io.Serializable {

/**
 * 
 */
private static final long serialVersionUID = 3530010885697280401L;
private Integer pkEventsId;
private SourceSystems sourceSystems;
private Tweets tweets;
private Date systemTimeStamp;

public Event() {
}

public Event(SourceSystems sourceSystems, Tweets tweets,
        Date systemTimeStamp) {
    this.sourceSystems = sourceSystems;
    this.tweets = tweets;
    this.systemTimeStamp = systemTimeStamp;
}

@Id
@Column(name = "PK_Events_Id", unique = true, nullable = false)
public Integer getPkEventsId() {
    return this.pkEventsId;
}

public void setPkEventsId(Integer pkEventsId) {
    this.pkEventsId = pkEventsId;
}

@JoinColumn(name = "SourceSystems_PK_SourceSystems_Id", nullable = false)
public SourceSystems getSourceSystems() {
    return this.sourceSystems;
}

public void setSourceSystems(SourceSystems sourceSystems) {
    this.sourceSystems = sourceSystems;
}

@JoinColumn(name = "Tweets_pk_tweet_id", nullable = false)
public Tweets getTweets() {
    return this.tweets;
}

public void setTweets(Tweets tweets) {
    this.tweets = tweets;
}

//@Temporal(TemporalType.TIMESTAMP)
@Column(name = "System_Time_Stamp", nullable = false, length = 19)
public Date getSystemTimeStamp() {
    return this.systemTimeStamp;
}

public void setSystemTimeStamp(Date systemTimeStamp) {
    this.systemTimeStamp = systemTimeStamp;
}

   }

和班级坚持

public class TweetPersistence extends HibernateBase {

private static int batchCounter = 0;

private static void store(Object object) throws HibernateException
{
    try {
        if(session == null)
        {
            session = sessionFactory.openSession();             
        }
        if(!session.isOpen())
        {
            session = sessionFactory.openSession();
        }
        session.save(object);
        LoggingConfigurator.getInstance().info("Objekt:" +object);
        //flush cache every 20 saved entities
        //if(batchCounter%20 == 0)
        //{
            session.flush();
            session.clear();
        //} 
        //increment batchCounter
        batchCounter++;
    } catch (HibernateException e) {
        e.printStackTrace(System.out);
    } 
}

public static void storeTweet(Tweets tweet) {

    try {

        if (tweet != null) {
            store(tweet);
        }
    } catch (HibernateException e) {
        e.printStackTrace(System.out);
    }       
  }
}

在日志中，我可以看到ID是正确生成的

- generated identifier: component[eventsPkEventsId,wordsPkWordListId,position]{position=128, wordsPkWordListId=128, eventsPkEventsId=56}