本节中描述的软件可以免费下载，在运行和安装示例 Web 应用程序之前，必须安装这些软件。
The software described in this section is available for download at no cost and must be installed prior to running and installing the sample Web application.
如果服务器上已经安装了低版本的代理，那么应该在安装新代理之前删除它。
If an agent with a lower version is installed on the server, it should be removed before installing the new agent.
由于您可能安装了多个 JRE，因此在安装应用程序之前，需要确保浏览器报告使用了正确的 JRE。
Since you may have multiple JREs installed, you need to make sure the browser reports the correct JRE is used prior to installing the application.
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