obj 是具有描述符的实例。

This obj is the instance that has the descriptor.

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当实例化 JAAS 回调处理程序时，WebSphere Application Server 运行时传入从部署描述符获取的用户名和密码。

The WebSphere Application Server runtime passes in a username and password that it pulls from the deployment descriptor when the JAAS callback handler is instantiated.

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在启动时，应用服务器会创建在部署描述符中指定的类的一个实例，并设置管理员提供的属性。

At startup, the application server creates an instance of the class specified in the deployment descriptor and sets the properties the administrator has provided.

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