Hibernate插入错误：在调用save（）之前必须手动分配该类的ID：

Question

我有这个我解决不了的问题，这是我的实体类：

/** identifier field */
private Long id;

/** persistent field */
private Long networkId;

/** persistent field */
private Long topicId;

private UserTopic topic;
private Network network;

/** 
 *            @hibernate.id
 *             generator-class="assigned"
 *             type="java.lang.Long"
 *             column="id"
 */
public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

/** 
 *            @hibernate.property
 *             type="java.lang.Long"
 *             column="network_id"
 *             not-null="true"
 */
public Long getNetworkId() {
    return networkId;
}

public void setNetworkId(Long networkId) {
    this.networkId = networkId;
}

/** 
 *            @hibernate.property
 *             type="java.lang.Long"
 *             column="user_topic_id"
 *             not-null="true"
 */
public Long getTopicId() {
    return topicId;
}

public void setTopicId(Long topicId) {
    this.topicId = topicId;
}   

/** 
 *            @hibernate.set
 *             lazy="true"
 *             inverse="true"
 *             cascade="none"
 *            @hibernate.key
 *             column="user_topic_id"
 *            @hibernate.one-to-many
 *             class="com.netblue.matchpoint.domain.UserTopic"
 *         
 */
public UserTopic getTopic() {
    return topic;
}

public void setTopic(UserTopic topic) {
    this.topic = topic;
}   

/** 
 *            @hibernate.set
 *             lazy="true"
 *             inverse="true"
 *             cascade="none"
 *            @hibernate.key
 *             column="network_id"
 *            @hibernate.one-to-many
 *             class="com.netblue.matchpoint.domain.Network"
 *         
 */    
public Network getNetwork() {
    return network;
}

public void setNetwork(Network network) {
    this.network = network;
}   

@Override
public String toString() {
    return "Network[id=" + id + "]";
}

        UserTopic topic = new UserTopic();
        topic.setId(topicId);
        topic.setName(ParseUtil.getString(map.get(MPConstants.TOPIC_NAME_PARAM)));
        topic.setCreatedBy(ParseUtil.getInt(map.get(MPConstants.USER_ID)));
        Date now = new Date();
        topic.setCreatedDt(now);
        topic.setLastUpdatedDt(now);
        topic.setStatusId(Status.ACTIVE);
        topic.setActivityCnt(0);
        userTopicDao.saveOrUpdate(topic);

        UserTopicMap utm = new UserTopicMap();
        utm.setId(topicId);
        utm.setMtid(topicId);
        utm.setOtid(topicId);
        utm.setIsDeleted(false);
        utm.setLastUpdatedDt(now);
        userTopicMapDao.saveOrUpdate(utm);

        Network network = MpAuctionUtil.getNetworkById(networkId);
        NetworkTopic networkTopic = new NetworkTopic();
        networkTopic.setNetworkId(networkId);
        networkTopic.setTopicId(topicId);
        networkTopic.setNetwork(network);
        networkTopic.setTopic(topic);
        LOG.debug("userTopicService addObjSubscriber x networkId="+networkId+", topicId="+topicId);
        networkTopicDao.saveOrUpdate(networkTopic);

最后一行是失败的，如果我移除它们，它起作用，我的意思是，它可以保存主题，但当我尝试这样做，它失败，我不知道如果我做错了什么，请帮助我！！

Answer 1

未为NetworkTopic类分配ID。您必须使用setId方法或考虑其他id策略之一

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