当收到一条消息时，该客户机便可以与应用服务器建立一个同步的RMI连接，并按照常规的方式调用会话bean或者实体bean。
Upon receiving a message, the client could then establish a synchronous RMI connection with the application server and invoke the session or entity beans in the usual way.
作为外观的会话Bean将通过其本地接口访问实体Bean，从其收集数据，然后将此信息返回发出调用的应用程序。
Instead, session beans acting as facades can access entity beans via their local interfaces, gather data from them, and then return this information to the calling application.
与会话Bean和实体Bean不同，消息驱动的Bean不会由其他Bean或客户端应用程序调用。
Unlike session and entity beans, message-driven beans are not invoked by other beans or client applications.
与会话Bean和实体Bean不同，消息驱动的Bean不会由其他Bean或客户端应用程序调用。
Unlike session and entity beans, message-driven beans are not invoked by other beans or client applications.
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