Ibatis : Retrieve value from Oracle DB's function

SQL Mapping

 <parameterMap class="map" id="getJobDescParam">  
      <parameter property="p_job_code" javaType="java.lang.String" jdbcType="VARCHAR" mode="IN"/>  
 </parameterMap>  
 <select id="getJobDesc" parameterMap="getJobDescParam" resultClass="java.lang.String">  
      select hr_util.get_job_desc(?) from dual  
 </select>  

Contoh kod DAO

      public String getJobDesc(String jobCode)   
      {  
           String returnString;  
           Map<String, Object> map = new HashMap<String, Object>();  
           map.put("p_job_code", jobCode);  
           // Reference com.icms.biz.dao.ibatis.maps.StaffMain.xml  
           returnString = (String)getSqlMapClientTemplate().queryForObject("getJobDesc",map);  
           if(StringUtils.isEmpty(returnString)){  
                returnString = "-";  
           }  
           return returnString;  
      }