为说明这些概念，请看一个在两个客户端之间使用XMPP进行IM通信的简单示例。

To illustrate these concepts, look at a simple example of an im communication using XMPP between two clients.

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请看清单4中，Groovy替我处理底层资源，从而非常漂亮地让我把注意力集中在手边的任务——执行一个简单的查询。

Watch how Groovy elegantly lets me focus on the task at hand — performing a simple query — and handles the underlying resource handling for me in Listing 4.

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在查看Geronimo以及它的DI实现方式之前，请看一个更简单的容器。

Before looking at Geronimo and how it implements DI, take a look at a simpler container.

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