hibernate3.2 @OneToMany异常

package com.hj.vo;

// default package

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import org.hibernate.annotations.Entity;
import org.hibernate.annotations.Generated;
import org.jaxen.function.FalseFunction;

/**
* TbComment generated by MyEclipse - Hibernate Tools
*/
@Entity
@Table(name="tbComment") //如不写默认类名
public class TbComment implements java.io.Serializable {

// Fields 所有没有定义注解的属性等价于在其上面添加了@Basic注解

/**
*
*/
private static final long serialVersionUID = 8808366677482487429L;

private Integer mainid;

private String content;

private Date addTime;

private Integer type;

private TbMyDiary myDiary;

/** default constructor */
public TbComment() {
}

/** minimal constructor */
public TbComment(Integer mainid) {
this.mainid = mainid;
}

/** full constructor */
public TbComment(Integer mainid, String content, Date addTime, Integer type) {
this.mainid = mainid;
this.content = content;
this.addTime = addTime;
this.type = type;
// this.targetId = targetId;
}

// Property accessors
@Id @GeneratedValue
public Integer getMainid() {
return this.mainid;
}

public void setMainid(Integer mainid) {
this.mainid = mainid;
}

public String getContent() {
return this.content;
}

public void setContent(String content) {
this.content = content;
}

@Column(name="add_time",updatable=false,insertable=false)
public Date getAddTime() {
return this.addTime;
}

public void setAddTime(Date addTime) {
this.addTime = addTime;
}

public Integer getType() {
return this.type;
}

public void setType(Integer type) {
this.type = type;
}

@ManyToOne
@JoinColumn(name="target_id")
public TbMyDiary getMyDiary() {
return myDiary;
}

public void setMyDiary(TbMyDiary myDiary) {
this.myDiary = myDiary;
}

}



package com.hj.vo;

// Generated Mar 1, 2008 12:07:56 AM by Hibernate Tools 3.2.0.CR1

import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;

/**
* TbMyDiary generated by hbm2java
*/
@Entity
public class TbMyDiary implements java.io.Serializable {

/**
*
*/
private static final long serialVersionUID = 5391171835504714756L;
private int mainid;
private String loginName;
private String title;
private String weather;
private String mood;
private String content;
private Date diarytime;
private Integer openLevel;
private Integer viewNum;
private Integer status;

private Set<TbComment> tbComments=new HashSet(0);

public Integer getStatus() {
return status;
}

public void setStatus(Integer status) {
this.status = status;
}

public TbMyDiary() {
}

public TbMyDiary(int mainid) {
this.mainid = mainid;

}

public TbMyDiary(int mainid, int FUserid, String loginName, String title,
String weather, String mood, String content, Date diarytime,
Integer openLevel) {
this.mainid = mainid;
this.loginName = loginName;
this.title = title;
this.weather = weather;
this.mood = mood;
this.content = content;
this.diarytime = diarytime;
this.openLevel = openLevel;
}

@Id @GeneratedValue
public int getMainid() {
return this.mainid;
}

public void setMainid(int mainid) {
this.mainid = mainid;
}

public String getLoginName() {
return this.loginName;
}

public void setLoginName(String loginName) {
this.loginName = loginName;
}

public String getTitle() {
return this.title;
}

public void setTitle(String title) {
this.title = title;
}

public String getWeather() {
return this.weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public String getMood() {
return this.mood;
}

public void setMood(String mood) {
this.mood = mood;
}

public String getContent() {
return this.content;
}

public void setContent(String content) {
this.content = content;
}

public Date getDiarytime() {
return this.diarytime;
}

public void setDiarytime(Date diarytime) {
this.diarytime = diarytime;
}

public Integer getOpenLevel() {
return this.openLevel;
}

public void setOpenLevel(Integer openLevel) {
this.openLevel = openLevel;
}

public Integer getViewNum() {
return viewNum;
}

public void setViewNum(Integer viewNum) {
this.viewNum = viewNum;
}

@OneToMany(mappedBy="myDiary")
public Set<TbComment> getTbComments() {
return tbComments;
}

public void setTbComments(Set<TbComment> tbComments) {
this.tbComments = tbComments;
}

}
异常信息：
%%%% Error Creating SessionFactory %%%%
org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.hj.vo.TbMyDiary.tbComments[com.hj.vo.TbComment]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1068)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:600)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:541)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1136)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:324)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
at com.hj.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:63)
at com.hj.HibernateSessionFactory.getSession(HibernateSessionFactory.java:45)
at com.hj.dao.CommentDAO.insert(CommentDAO.java:21)
at com.hj.dao.CommentDAO.main(CommentDAO.java:14)