ibatis事务管理问题--无法实现事务回滚

框架:
  spring+ibatis
数据库:
  oracle

User表:有userId和userName列
对应的DDL语句:create table user(userId NUMBER(5) primary key,userName VARCHAR2(50))

User类:
package model;
public class User {
    // Fields   
     private Integer userid;
     private String username;

    public Integer getUserid() {
        return this.userid;
    }
   
    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return this.username;
    }
   
    public void setUsername(String username) {
        this.username = username;
    }
}


ibatis配置文件:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="User">
  <typeAlias alias="user" type="model.User"/>
  <insert id="saveUser" parameterClass="user">
     insert into user(userid,username) values(#userid#,#username#)
  </insert>
</sqlMap>

配置文件(applicationContext.xml):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!-- DataSource -->
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>oracle.jdbc.driver.OracleDriver</value>
</property>
<property name="url">
<value>jdbc:oracle:thin:@192.168.0.200:1521:test</value>
</property>
<property name="username">
<value>linmin</value>
</property>
<property name="password">
<value>lm123</value>
</property>
</bean>
   
    <!-- Spring iBatis Template -->
    <bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
    <property name="configLocation" value="sqlmap-config.xml"/>
    <property name="dataSource" ref="dataSource"/>
  </bean>
 
<!-- UserDAO方案一 -->
<bean id="userDAO1" class="dao.UserDAOImpl">
<property name="sqlMapClient">
<ref bean="sqlMapClient"/>
</property>
</bean>
    </beans>


DAO接口:
package dao;
import model.User;
public interface UserDAO {
public User1 saveUser(User user) throws Exception;
}


DAO实现类:
package dao;
import java.sql.SQLException;
import model.User;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.ibatis.sqlmap.client.SqlMapClient;
public class UserDAOImpl implements UserDAO {
protected SqlMapClient sqlMapClient;

public User1 saveUser(User user) throws Exception{
try {
sqlMapClient.startTransaction();
          sqlMapClient.insert("saveUser",user);
          sqlMapClient.insert("saveUser",user);
          sqlMapClient.commitTransaction();
      return user;
        } finally{
        sqlMapClient.endTransaction();

        }

}

public SqlMapClient getSqlMapClient() {
return sqlMapClient;
}

public void setSqlMapClient(SqlMapClient sqlMapClient) {
this.sqlMapClient = sqlMapClient;
}

}

测试类:
package test;
import dao.*;
import model.*;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class TestDAO1 {
public static void main(String[] args) {
try{
ClassPathResource res = new ClassPathResource("applicationContext.xml");
XmlBeanFactory factory = new XmlBeanFactory(res);
User user = new User(1,"guadi");
UserDAO dao = (UserDAO)factory.getBean("userDAO1");
                  dao.saveUser(user);
}catch(Exception e){
  e.printStackTrace();
}

}

}


预期结果:
   两语句均回滚,数据库中无记录
结果:数据库中有一条记录
    userid:1 username:guadi
   即第一条insert语句成功,第二条insert语句失败

这是为什么啊，为什么不能将声明的整个事务回滚，如果可以的话，该如果写？

自动代理

<?xml version="1.0" encoding="GB2312"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"
	default-lazy-init="true">


	<description>自动代理对象下文环境</description>


	<aop:config>
		<aop:advisor pointcut="execution(* *..*Logic.*(..))"
			advice-ref="txAdvice" />
	</aop:config>


</beans>

事务配置
<?xml version="1.0" encoding="GB2312"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	     xmlns:aop="http://www.springframework.org/schema/aop"
	     xmlns:tx="http://www.springframework.org/schema/tx"
	     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
           default-lazy-init="true">	

	<description>JDBC事务对象下文环境</description>
	<!-- 事务管理 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 事务要使用的数据源 -->
		<property name="dataSource">
			<ref bean="dataSource" />
		</property>
	</bean>

    
	<tx:advice id="txAdvice">
		<tx:attributes>
			<tx:method name="add*"/>
			<tx:method name="modify"/>
			<tx:method name="delete*"/>
			<tx:method name="*" read-only="true"/>
		</tx:attributes>
	</tx:advice>
	
</beans>