mybatis 返回List＜String＞

public interface OraBackupInfoMapper 
{
    
    List queryRacList();
}

    
        SELECT DISTINCT rac_name FROM `ora_backup_info`
    

@Test
    public void testApi(){
        List racList = oraBackupInfoMapper.queryRacList();
        System.out.println(racList);
    }

运行结果报错：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.UnsupportedOperationException
### The error may exist in file [D:workspace_ruoyi_codebranchhipaaspaastargetclassesmapperoracleOraBackupInfoMapper.xml]
### The error may involve com.hidata.devops.selfops.mapper.OraBackupInfoMapper.queryRacList
### The error occurred while handling results
### SQL: SELECT DISTINCT rac_name FROM `ora_backup_info`
### Cause: java.lang.UnsupportedOperationException

将resultType=“java.util.List” 修改为 resultType=“String”

    
        SELECT DISTINCT rac_name FROM `ora_backup_info`