有关一对多的关联

我的错误是

net.sf.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info); setter of its.hibernate.WorkFlow.setTcardbasicinfos

	at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:216);

	at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2137);

	at net.sf.hibernate.loader.Loader.doQuery(Loader.java:239);

	at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132);

	at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:830);

	at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:850);

	at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:57);

	at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:49);

	at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:420);

	at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2044);

	at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1918);

	at net.sf.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1880);

	at net.sf.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:68);

	at net.sf.hibernate.type.EntityType.resolveIdentifier(EntityType.java:215);

	at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2132);

	at net.sf.hibernate.loader.Loader.doQuery(Loader.java:239);

	at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132);

	at net.sf.hibernate.loader.Loader.doList(Loader.java:949);

	at net.sf.hibernate.loader.Loader.list(Loader.java:940);

	at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:833);

	at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1475);

	at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39);

	at its.zp.main(zp.java:57);

Caused by: net.sf.cglib.beans.BulkBeanException

	at its.hibernate.WorkFlow$$BulkBeanByCGLIB$$7a8e29ee.setPropertyValues(<generated>);

	at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:211);

	... 22 more

Caused by: java.lang.ClassCastException

	... 24 more

Exception in thread "main" 

测试类用的代码如下
    SessionFactory sf = new Configuration();.configure();.buildSessionFactory();;
    Session session = sf.openSession();;
    Transaction tx = session.beginTransaction();;
    Session ss = ITSDB.getSession();;
    String queryString = "from Drawing as Drawing";
    Query query = session.createQuery(queryString);;
    List l = query.list();;
    System.out.println(((Drawing);l.get(0););.getDrawingid(););;
DRAWING类是一个Hibernate的类测试过XML也通过的,想请问一下,我的错误在哪

类文件的内容
package its.hibernate;
import java.io.Serializable;
import java.lang.*;

public class Drawing implements Serializable{
  private int drawingid;
  private String drawingname;
  private String drawingtype;
  private String drawingdesc;
  private String drawingaddr;
  private int tworkflow;
  private int tcardbasicid;

  public Drawing() {
  }
  public Drawing(String drawingname,String drawingtype,int tworkflow,int tcardbasicid) {
    this.drawingname=drawingname;
    this.drawingtype=drawingtype;
    this.tworkflow =tworkflow;
    this.tcardbasicid =tcardbasicid;
  }
  public Drawing(String drawingname,String drawingtype,String drawingdesc,String drawingaddr,int tworkflow,int tcardbasicid) {
    this.drawingname=drawingname;
    this.drawingtype =drawingtype;
    this.drawingdesc =drawingdesc;
    this.drawingaddr=drawingaddr;
    this.tworkflow=tworkflow;
    this.tcardbasicid =tcardbasicid;
  }
  public int getDrawingid() {
    return drawingid;
  }
  public void setDrawingid(int drawingid) {
    this.drawingid = drawingid;
  }
  public String getDrawingname() {
    return drawingname;
  }
  public void setDrawingname(String drawingname) {
    this.drawingname = drawingname;
  }
  public String getDrawingtype() {
    return drawingtype;
  }
  public void setDrawingtype(String drawingtype) {
    this.drawingtype = drawingtype;
  }
  public String getDrawingdesc() {
    return drawingdesc;
  }
  public void setDrawingdesc(String drawingdesc) {
    this.drawingdesc = drawingdesc;
  }
  public String getDrawingaddr() {
    return drawingaddr;
  }
  public void setDrawingaddr(String drawingaddr) {
    this.drawingaddr = drawingaddr;
  }
  public int getTworkflow() {
    return tworkflow;
  }
  public void setTworkflow(int tworkflow) {
    this.tworkflow = tworkflow;
  }
  public int getTcardbasicid() {
    return tcardbasicid;
  }
  public void setTcardbasicid(int tcardbasicid) {
    this.tcardbasicid = tcardbasicid;
  }

}

错误可能出现在Workflow中的setTcardbasicinfos(),检查以一下。贴出AbstractEntityPersister.java

昨天我用QQ问过yehs220,他说应当是这样定义
/**
     * @hibernate.many-to-one
     *  column="MATE_ID"
     */
    public Cat getMate() {
        return mate;
    }
    void setMate(Cat mate) {
        this.mate = mate;
    }
 
  说实话文档看过,我还是有一点没明白,我二个表一个主键一个外键都是INT而且一定都是非空的,这样也要定义另一个类来保存他们吗?
请大家告我,我现在越来越不明白(我没看明白文档)

...............人气好少.是我的问题太容易你们都不高兴回答吗?

你的做法虽然没问题，但建议不要用传统的关系数据库思想来思考面向对象的问题.

不是要定义类来保存主键和外键。假设有parent表和child表. parent表是child外键表,child表中的外键为parentid.  传统是你的写法。但面向对象的做法如yehs220的例子.在这里是:
child.java
/**
* @hibernate.many-to-one
* column="parentid"
*/
public Parent getParent() {
return parent;
}
void setMate(Parent parent) {
this.parent = parent;
}

传统做法是:
public int getParentId() {
    return parentid;
}
void setParentId(int parentid) {
   this.parentid = parentid;
}

如果这样,在hbm.xml文件中就不需要影射many-to-one的关系了.

我想问一下,你的意思是说如果我用INT就不用在XML里写many-to-one的关系了
今天我同事有一种方法,一对多的用Set ,一对一和多对一的,用对象,也不报错了,可以请教一下这是怎么回事吗?是你说的新方法吗?

用你同事的做法是正确的做法。我的意思是如果你不想按照你同事的做法，在映射文件中将将所有非主键都影射成普通属性,只能在程序中实现表和表之间关联了。那么实际表之间也必须去掉关联。也就是说，如果数据库表之间必须建立外键关联的话，用你同事的方法。

3Q,明白啦
我用工具生成出来类看了一下,嘻嘻