ant中build.xml为什么生不出.hbm.xml映射文件

build.xml

<?xml version="1.0" encoding="GBK"?>
<project name="OA系统构建脚本" default="生成Hibernate配置文件" basedir=".">

    <property name="src.dir" value="${basedir}/src"/>
 <property name="xdoclet.home" value="E:/xdoclet-plugins-1.0.3"/>

    <!-- Build classpath -->
    <path id="xdoclet.task.classpath">
       <fileset dir="${xdoclet.home}/lib">
          <include name="**/*.jar"/>
       </fileset>
       <fileset dir="${xdoclet.home}/plugins">
          <include name="**/*.jar"/>
       </fileset>
    </path>
 <taskdef
  name="xdoclet"
  classname="org.xdoclet.ant.XDocletTask"
  classpathref="xdoclet.task.classpath"
 />
 
 <target name="生成Hibernate配置文件">
  <xdoclet>
   <fileset dir="${src.dir}/com/bjsxt/oa/model">
    <include name="**/*.java"/>
   </fileset>   
   <component
    classname="org.xdoclet.plugin.hibernate.HibernateConfigPlugin"
    destdir="${src.dir}"
    version="3.0"
    hbm2ddlauto="update"
    jdbcurl="jdbc:mysql://127.0.0.1/oa01"
    jdbcdriver="com.mysql.jdbc.Driver"
    jdbcusername="root"
    jdbcpassword=""
    dialect="org.hibernate.dialect.MySQLDialect"
    showsql="true"
   />
  </xdoclet>
 </target>
 <target name="生成hibernate映射文件">
  <xdoclet>
   <fileset dir="${src.dir}/com/bjsxt/oa/model">
    <include name="**/*.java"/>
   </fileset>
   <component
    classname="org.xdoclet.plugin.hibernate.HibernateMappingPlugin"
    version="3.0"
    destdir="${src.dir}"
   />
  </xdoclet>
 </target>
</project>

 

User.class

package com.bjsxt.oa.model;

public class User {
 private Integer id;
 private String username;
 private String password;
 public Integer getId() {
  return id;
 }
 public void setId(Integer id) {
  this.id = id;
 }
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
}

可以生出配置文件hibernate.cfg.xml，为什么不能生出映射文件User.hbm.xml？