MyBatis报错Invalid bound statement (not found)

今天在练习 MyBatis 时出现了一个问题：
mapper.java代码如下

@Mapper
public interface UserinfoMapper {
    List<Userinfo> testOracle1(String username);
    List<Userinfo> testOracle2(String username);
    List<Userinfo> testOracle3(String username, String password);
    List<Userinfo> testMySQL1(String username);
    List<Userinfo> testMySQL2(String username);
    List<Userinfo> testMySQL3(String username, String password);
}

mapper.xml代码如下

    <select id="testOracle1" parameterType="String" resultType="com.lj.www.entity.Userinfo" 
          databaseId="Oracle">
        select *
        from userinfo
        where username like '%${value}%'
    </select>
    <select id="testOracle2" parameterType="String" resultType="userinfo" databaseId="Oracle">
        select * from userinfo where username like '%'||#{value}||'%'
    </select>
    <select id="testOracle3" parameterType="String" resultType="userinfo" databaseId="Oracle">
        select * from userinfo
        where username like
            '%'||#{username}||'%'
        and password like
            '%'||#{password}||'%'
    </select>

    <select id="testMySQL1" parameterType="java.lang.String"
            resultType="userinfo" databaseId="MySQL">
        select *
        from userinfo
        where username like '%${value}%';
    </select>
    <select id="testMySQL2" parameterType="String" resultType="userinfo" databaseId="MySQL">
        select * from userinfo where username like concat("%",#{value},"%")
    </select>
    <select id="testMySQL3" parameterType="String" resultType="userinfo" databaseId="MySQL">
        select * from userinfo
        where username like
              concat("%",#{username},"%")
          and password like
              concat("%",#{password},"%")
    </select>

Controller代码如下

    @ResponseBody
    @RequestMapping("test3")
    public void test3(){
        String username = "x";
        String password = "c";
        mapper.testOracle1(username);
        mapper.testOracle2(username);
        mapper.testOracle3(username,password);
        username = "中国";
        password = "中国人";
        mapper.testMySQL1(username);
        mapper.testMySQL2(username);
        mapper.testMySQL3(username,password);
    }

最终报错
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.lj.www.mapper.UserinfoMapper.testMySQL1
请问问题出在了哪里(target目录下的内容正常更新)

你是多数据库配置?