org.hibernate.Invalid总报这个 MappingException: Could not parse mapping document from resource Student.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!-- Generated 2016-7-11 11:54:54 by Hibernate Tools 3.4.0.CR1 -->

<hibernate-mapping>

    <class name="Student" table="STUDENT">

        <id name="sid" type="int">

            <column name="SID" />

            <!--sid的属性初始值为0 -->

            <!-- <generator class="assigned" /> -->

            <!--  sid的属性值从1开始自动递增-->

           <generator class="native"></generator>

        </id>

        <property name="sname" type="java.lang.String">

            <column name="SNAME" />

        </property>

        <property name="gender" type="java.lang.String">

            <column name="GENDER" />

        </property>

        <property name="birthday" type="java.util.Date">

            <column name="BIRTHDAY" />

        </property>

        <property name="picture" type="java.sql.Blob">

            <column name="PICTURE" />

        </property>

<!--         <property name="address" type="java.lang.String">

            <column name="ADDRESS" />

        </property> -->

        <component name="address"  class="Address">

              <property name="aid" column="AID"></property>

              <property name="postcode" column="POSTCODE"></property>

              <property name="phone" column="PHONE"></property>

              <property name="address" column="ADDRESS"></property>

        </component>

    </class>

</hibernate-mapping>