如果遇到这样的消息，一定要确认连接到数据库的用户或应用程序是否提供了合法的用户ID和口令。
If you ever encounter these messages, ensure that the user or application connecting to the database has provided a valid user id and password.
用户身份验证确认用户名和口令是否正确。
User authentication validates that the user name and password are correct.
要确认数据库中的口令更新，可以使用DbUnit的查询api，它帮助比较数据库的结果与静态定义的XML文件，例如清单9中定义的那个。
To confirm an updated password in the database, you use DbUnit's Query API, which facilitates comparing database results with statically defined XML files, such as the one defined in Listing 9.
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