cfg.xml配置文件

<property name="connection.username">root</property>

     <property name="connection.password">root</property>

     <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

     <property name="connection.url">jdbc:mysql:///hibernate?useUnicode=true&characterEncoding=UTF-8</property>

     <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

     <property name="show_sql">true</property>

     <property name="format_sql">true</property>

     <property name="hbm2ddl.auto">create</property>

     <mapping resource="Students.hbm.xml"/>

students.hbm.xml文件

 <class name="com.hibernate.Students" table="STUDENTS">

        <id name="id" type="int">

            <column name="ID" />

            <generator class="assigned" />

        </id>

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

            <column name="NAME" />

        </property>

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

            <column name="SEX" />

        </property>

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

            <column name="BIRTHDAT" />

        </property>

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

            <column name="ADDRESS" />

        </property>

来人帮忙看看原因