以前没有怎么用过Oracle，oralce的包也导入了啊，真是想不通啊。。。。。希望大家能帮我看看啊，谢谢啊。。。
java代码：
package com.xiaotong.taobao.bean;
public class Teacher {
private int id;
private String teachername;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTeachername() {
return teachername;
}
public void setTeachername(String teachername) {
this.teachername = teachername;
}
}
映射文件：***********************************************
<hibernate-mapping package="com.xiaotong.taobao.bean">
<class name="Teacher">
<id name="id">
<generator class="sequence">
<param name="sequence">Teacher_id_seq </param>
</generator>
</id>
<property name="teachername" column="teacher_name"/>
</class>
</hibernate-mapping>
测试类代码：***********************************
package com.xiaotong.taobao.test;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.xiaotong.taobao.bean.Teacher;
import com.xiaoton
